The Qaidam basin, northwest China, has producing oil fields in the northwestern and northeastern corners of the basin. However, the petroleum systems in the basin and molecular organic geochemistry of the oils are undocumented. Jurassic and Tertiary petroleum source rocks occur throughout the northern Gaidam ...
Energy Citations Database
Organic geochemistry of oils from the Tarim basin, NW China, distinguish at least seven genetic groups of oils. The largest group are derived from Middle-Upper Ordovician anoxic slope-facies marls coincident with the margins of structural uplifts. Other groups include non-marine derived oils in the Luntai uplift, from southwest Tarim, in the Kuqa ...
NASA Astrophysics Data System (ADS)
The Qaidam basin and Hexi Corridor, two major basins lying within and adjacent to the northern Tibetan Plateau margin, are separated by the Qilian Shan fold-thrust belt and bounded by the Altyn Tagh fault (ATF) to the northwest. Understanding the formation and evolution of these basins provides insight into the ...
... low velocity anomalies are a good indicator of sedimentary basins. ... with the locations of major basins, including the Tarim Basin, Qaidam Basin ...
DTIC Science & Technology
As of 1981, more than 60 natural gas fields with a total annual output of 12.74 billion cu m have been discovered in China, placing the country among the top 12 gas producers in the world. In addition, there are prospects for natural gas in the Bohai-North China Basin and the Qaidam Basin, NW. China, providing a ...
Our study of Ar-Ar ages of detrital white mica from Eocene to Pliocene successions of the Qaidam basin shows almost exclusively ages with 250 � 3 and 279 � 3 Ma in the northeastern part of the basin (Rieser et al., 2007), in contrast to a dominance of mainly early Palaeozoic ages in its western part. As no nearby source of these ...
David Rubin and Patrick Hesp spent a night in a labour camp come hotel while trying to uncover the factors that shape sand dunes in the Qaidam Basin, China.
Coal deposits have been found in the Qaidam Basin. Cooler climate crops such as wheat, highland barley, millet, and potatoes are grown during the short, ...
NASA Website
... p. Grunt, T. A. 1968. Rod Spirigerella i ego tipovoi vid Spirigerella derbyi. Paleontologicheskii Zhurnal 1968/3: ... ...
NBII National Biological Information Infrastructure
The International Deep Profiling of Tibet and the Himalaya Phase IV (INDEPTH IV) active source seismic profile in northeast Tibet extends 270 km roughly north-south across the Songpan-Ganzi terrane, the predominantly strike-slip North Kunlun Fault (along the Kunlun suture), the East Kunlun Mountains, and the south Qaidam Basin. Refraction, reflection, and ...
The southern margin of the Qilianshan is a long, narrow mountain range extending from the Altyn Mtn southeastward to the Alcitoshan for about 800 km and consists chiefly of Proterozoic and Paleozoic rocks. Our recent studies show that this foldbelt consists of a Caledonian north Qaidam UHP belt near the Qaidam Basin and I-type and ...
1 CONSTRAINTS ON THE MECHANISM OF THE ALTYN TAGH FAULT FROM PALEOMAGNETISM by Guillaume Dupont.................................................................................................. 18 CHAPTER 2: PALEOMAGNETISM INDICATES NO NEOGENE ROTATION OF THE QAIDAM BASIN IN NORTHERN ...
E-print Network
The Tibet plateau is considered to have been constructed by a number of basement terranes accreted to the Eurasian margin during Paleozoic to Mesozoic times, and accretion is interpreted to have progressed southwards. The northern margin, exposed in Altyn and Qilian Mountains, is generally considered as an Lower Paleozoic orogen including previously subducted ultra-high successions (Yin and ...
Modern potash salt deposits and associated brines of the Qaidam Basin, western China, demonstrate that some anomalous marine evaporites may have formed from nonmarine brines instead of seawater. Qaidam Basin brines are derived from meteoric river inflow mixed with small amounts of CaCl spring inflow similar in ...
PubMed
Several new Alpine-type HP/UHP terranes occur in the Altun-Qaidam-Mountains and Beishan of NW China; we have identified UHP garnet lherzolite and eclogite in the North Qaidam Mountains. This finding is supported by Raman spectrum identification of coesite inclusions in zircon separates from paragneissic rocks in the eastern part of the ...
(Lycopodium clavatum) spores have also been used as tracers in karstic regions. The spores of Lycopodium clavatum are nearly spherical, have a diameter of 30 m, and have a density slightly higher than
Repository item 2002023. 263 Paleomagnetism indicates no Neogene rotation of the Qaidam Basin in northern's Republic of China ABSTRACT Paleomagnetic data were obtained from Tertiary red sedimen- tary rocks at two paleomagnetic di- rections indicate no Neogene vertical-axis rotation of the Qaidam Basin or the Altyn ...
It has been reported that mega-lakes with much higher lake level existed throughout the Tibetan Plateau and its adjacent areas. In the Qaidam basin lake levels up to c 140 m higher than present have been observed. 14C dating results indicate that there was a high lake level during the Marine Isotope Stage (MIS) 3 in the Qaidam ...
Controlled-source recordings and p-wave receiver functions (PRFs) collected as part of project INDEPTH IV (International Deep Profiling of Tibet and the Himalaya, phase IV) provide independent constraints on crustal structure from the Songpan-Ganzi terrane to the Qaidam Basin in northeast Tibet. Wide-angle refraction and reflection data was collected along ...
This is an article for the column - NW Geology - in the TC Herald. This column describes the relationship between geology and wine in the Columbia Basin.
Felsic gneisses near Yuka, western North Qaidam Mountains (NQD), and (60 km SE) near Xitieshan, central NQD, enclose eclogite-bearing mafic boudins. Inclusions in prograde-zoned garnets from a Yuka eclogite record pre-eclogite facies conditions of 12.1 � 2.1 kbar, 603 � 36 �C. The phengite-bearing matrix assemblage records peak conditions near or in the coesite stability ...
Carbon and oxygen stable isotopic composition of Cenozoic lacustrine carbonates from the intramontane Qaidam Basin yields cycles of variable length and shows several distinct events driven by tectonics and climate changes. From Eocene to Oligocene, the over-all trend in the ?13C composition of lacustrine carbonates shows a shift toward higher values, ...
Based on the investigation data of Sabina przewalskii tree-ring width at six sites at upper timberlines in eastern mountainous region of Qaidam Basin, the standard tree-ring chronologies of S. przewalskii were established. Cluster analysis indicated that there existed geographical differences in the radial growth of S. przewalskii among the sites. Higher ...
Zhu and Helmberger (1998) reported a 15-20 km Moho offset over a narrow 5 km range under the northern margin of the Tibetan Plateau near Golmud from anomalous double-pulse teleseismic P-wave arrivals. They proposed a hotter, more ductile, less dense lower crust under the Tibetan Plateau in the south abutting a cold, rigid Qaidam Basin crust to the north, ...
... NW 6/11/92 y~ Page 3. ... in Article 6 the desirability of creating common organs to establisbgplans for the utilization of particular basins. ... basin" stated: ...
Yardangs are elongated, wind-scoured ridges that form parallel to intense and long-lived winds in almost every desert on Earth. These prominent features, however, have been rarely observed in the stratigraphic record, despite their obvious utility as a paleoclimate proxy. We have documented sedimentologic evidence for buried yardangs called �paleoyardangs,� within Plio-Pleistocene strata in ...
The northern Tibetan Plateau, containing the intermontane Qaidam basin, sinistral strike-slip Altyn Tagh fault (ATF), Qilian Shan fold-thrust belt, and Hexi Corridor, plays a key role in accommodating the India-Eurasia convergence. However, the timing and deformation mode remain disputed. Here we present research results from the basin ...
of salty soils are also found, including Glaux maritima and Triglochin maritimum. Distinct vegetation types demer- sum, and Ruppia spp. The vegetation further away from lake shore is dominated by a mixture types around Hurleg Lake and in the study region from Qinghai Lake to Yazi Lake. (A) Ruppia
The closed inland Qaidam Basin in the NE Tibetan Plateau contains possibly the world's thickest (� 12,000 m) continuous sequence of Cenozoic fluviolacustrine sedimentary rocks. This sequence contains considerable information on the history of Tibetan uplift and associated climatic change. However, work within Qaidam ...
Concentration of crustal displacement along a weak Altyn Tagh fault: Evidence from paleomagnetism whether this strike curvature is due to oroclinal bending, we analyzed paleomagnetic samples from 109 above an arcuate thrust ramp. Along with paleomagnetic data from the northern Qaidam Basin
May 5, 2010 ... Intra-Crater Structure in NW Hellas Basin, Mars ... Kasei Valles Fractures Added October 27, 2010. Rate this: ...
Qinghai-Tibet (QT) Plateau has the highest average elevation on Earth (~ 4500 m, about 50-60% of atmospheric pressure at sea-level). The high elevation induces a tremendous diurnal (and seasonal) temperature swing caused by high level of solar irradiation during the day and low level of atmospheric insulation during the evening. In addition, the Himalaya mountain chain (average height >6100 m) ...
We have carried out a detailed magnetostratigraphic study of Tertiary sediments in the northern margin of the Qaidam Basin, northern Tibetan plateau. A total of 400 paleomagnetic samples (with an interval of about 2 m) were collected from the Shanggancaigou and Xiagancaigou Formations in the Hongsanhan section. Stepwise thermal demagnetization was used to ...
... of some effect of the basin-mountain boundary ... do not cross any significant sedimentary basins but still ... Where the subscripts sc and nw indicate that ...
We present the results of a seismic wide-angle reflection/refraction profile across the northern margin of the Tibetan plateau. The 350-km- long profile extends from Golmud at the northern margin of the East-Kunlun Shan to Huahaizi at the southern margin of the Qilian Shan. The determination of the P- and S-wave velocity structure and Poisson's ratio provide constraints on composition. The crust ...
Substantial debate centers on the spatial extent and slip history of the Altyn Tagh Fault (ATF) and the role that it plays in accommodating strain due to the India-Asia collision. Two models - a continuum thickening model and a two-stage evolution model - comprise end-member hypotheses for Altyn Tagh Fault evolution. The former posits that ATF terminates at the Qilian Shan range front, while the ...
As of 1981, China was producing some 474.4 billion CF (12.74 billion m/sup 3/)/yr of natural gas from over 60 gas fields, 40 of them in Sichuan Province. The Sichuan gas lies in fractures and solution cavities in limestone and dolomite formations that generally require stimulation. After desulfurization, the gas is used by the steel and chemical industries and for residential heating. Recent ...
One of the salient features of the greater Himalayan/Tibetan orogen is the large sedimentary basins that sit along the northern margin of the Tibetan Plateau. These basins record the surface uplift of adjacent ranges and the attendant reorganization of climatic patterns. As such, we present a record of oxygen and carbon isotope values of Cenozoic ...
Qaidam basin is a Mesozoic and Cenozoic inland oil basin where the abnormal formation pressure is as developed as in many offshore regions. The abnormal formation pressures are found at depths below 3200 m in relatively depressed regions. Their pressure gradients are from 0.14 to 0.22 atm/m. The causes of abnormal formation pressure in ...
Tertiary and Quaternary nonmarine, petroleum-bearing sedimentary rocks in the Qaidam basin of remote western China have been extensively deformed by compressive forces. These forces created many folds which are current targets of Chinese exploration programs. Manual techniques of image analysis and interpretation were applied to computer-enhanced Landsat ...
Magnetostratigraphy from the Chaka basin in northeastern Tibet suggests that sedimentation began near 10 Ma, and sedimentary facies suggest that the adjacent Qinghai Nan Shan immediately north developed at that time, tens of millions of years after India and Eurasia collided. A fining-upward sequence and provenance analysis indicate a growing transport distance for ...
Based on GIS technique and the methods of mean-squared deviation weight decision and catastrophe progression, a more clear definition and associated evaluation for ecosystem resilience were given, with a case study in the regions across Qinghai-Tibet railway by using the indices of plant community coverage, species diversity, and biomass. It was shown that the areas with high ecosystem resilience ...
Desert environments are a major source of global loess and may undergo substantial wind-erosion as evidenced by yardangs, which are streamlined bedrock ridges sculpted from uni-directional winds. However, there are few quantitative estimates of wind erosion rates in deflationary deserts, globally. Here, we report the first quantitative rates of bedrock wind erosion determined using cosmogenic 10Be ...
There are 37 lakes in the Qaidam Basin: 1 freshwater lake, 6 brackish-water lakes, 2 saline-water lakes and 28 salt lakes. The pH value of salt lake brines is 7.014 on the average, and the average total mineralization is 340.75 g/1. Their water bodies belong mainly to the five-component equilibrium system,: Na, K, Mg//SO4, Cl-H2O, which can be further ...
We established the first annual resolution tree ring ?18O chronology of Qilian juniper (Sabina przewalskii Kom.) for the eastern margin of the Qaidam Basin, northwestern China. The mean tree ring cellulose ?18O in the study region (33.46� � 0.99�) was higher than that in the Qilian (28.7�) and Helan Mountains (27.66�), northwest China, and higher ...
Scattered with numerous salt lakes and approximately 2,700-3,200 m above sea level, the giant Qaidam inland basin on the northern Tibetan Plateau has experienced continuing aridification since the beginning of the Late Cenozoic as a result of the India-Asia plate collision and associated uplift of the Tibetan Plateau. Previous evidence of aridification ...
Scattered with numerous salt lakes and ?2,700�3,200 m above sea level, the giant Qaidam inland basin on the northern Tibetan Plateau has experienced continuing aridification since the beginning of the Late Cenozoic as a result of the India�Asia plate collision and associated uplift of the Tibetan Plateau. Previous evidence of aridification comes mainly ...
PubMed Central
Fieldwork complemented by SPOT image analysis throws light on current crustal shortening processes in the ranges of northeastern Tibet (Gansu and Qinghai provinces, China). The ongoing deformation of Late-Pleistocene bajada aprons in the forelands of the ranges involves folding, at various scales, and chiefly north-vergent, seismogenic thrusts. The most active thrusts usually break the ground many ...
... Patagenia Argentina 260 5 ... the area, the surrounding highlands forming a basin, the infrequent ... S Central NE Africa NW Africa Mid-East Asia World* ...
... Buenos Aires, Argentina Honolulu 14, Hawaii ... 734 Jackson Place, NW Honolulu, Hawaii ... David Taylor Model Basin 1013 East 40th Street ...
First mid-Neoproterozoic paleomagnetic results from the Tarim Basin (NW China) and their geodynamic history of the Rodinia supercontinent, a paleomagnetic study has been carried out on the 807 � 12 Ma Aksu paleomagnetic pole, therefore, is computed: 19�N, 128�E, DP = 6�, DM = 7� with N = 9. This new paleomagnetic
We review fossil pollen records from our three study lakes in the Qaidam Basin on the NE Tibetan Plateau and investigate the possible different responses of high- and low-elevation moisture conditions to large-scale climate forcing by comparing with the reconstructed precipitation data from the surrounding mountains. The near-annual resolution pollen data ...
Amphibolite-facies felsic gneisses of the North Qaidam Mountains enclose minor (<10 vol.%) peridotitie and pyroxenite (+/- garnet), and eclogite. Discovery of coesite in zircon from the felsic gneiss indicates Early Paleozoic UHP metamorphism (Yang et al. 2001, Eos Trans. AGU, 82(47), Fall Meet. Suppl., Abstract V32C-0979). Eclogite, garnetite, amphibolite, and pyroxenite ...
The Q of regional seismic phases Lg and Pg within the crust is assumed as a proxy for crustal Q? and Q?, which is used as a constraint of crustal rheology. We measure regional-phase Q of the eastern Tibetan Plateau and adjacent areas. This method eliminates contributions from source and site responses and is an improvement on the Two-Station Method (TSM). We have generated tomographic images of ...
A model for the collision between a sand grain and a body of yardang material is established by using the principles of classical mechanics. A new nondimensional parameter, the �abrasion number� An, is derived from the model. The volume removed per impact for different targets is proportional to An approximately. As an indicator of the energy ratio of the impacting material to the target ...
The continental lithosphere of China is situated at the junction of the Marginal-Pacific and Tethys-Himalayan tectonic domains. The most manifest tectonic movements responsible for the deformation of the continental lithosphere of China are taphrogenic, collisional, and shearing. These movements played an important role in the Mesozoic and Cenozoic tectonic evolution of China and formed various ...
The catchment basin of the River Hunte (Lower Saxony, NW-German Basin) was studied on a mesoscale (length of ~90 km) to investigate the influence of the geological subground on modern morphology. A Geo Information System (GIS) was used to calculate linear correlation coefficients between the depth of geological strata (Base Zechstein ...
Tree-ring samples of Picea crassifolia were collected from the upper tree-line in the eastern mountainous area of Qaidam Basin in Qinghai Province. The tree-ring width and the cell number and size of the tree-ring were measured, and the standard chronologies for the early-wood cell number, late-wood cell number, total cell number of tree-rings, maximum ...
This study presents the Sr and Nd isotopic composition of dust from a shallow Dunde ice core (38�06?N, 96�24?E, 5325 m a.s.l.), Northern China, in order to trace its source regions and the provenance of long-range transported (LRT) Asian dust. Dunde dust samples show similar Sr (87Sr/86Sr averages 0.719982 and varies between 0.715220 and 0.721874) and Nd (?Nd(0) averages - 10.6 and ranges from ...
Evaporites accumulate in ephemeral saline-pans, shallow perennial lakes or lagoons, and deep perennial systems. Continuous brine trench exposures of Holocene evaporites from the Qaidam basin provide criteria for the recognition of shallow perennial lake sediments. Based on Landsat photographs, lateral extent of beds (at least 7 km), and sequence ...
... myr, but there is no evidence for declining coral growth during this interval (Johnson and Pérez, 2006), suggesting ... carbonate accumulation was not a function of reduced coral growth rates. This result...
observation are available at http://hirise.lpl.arizona.edu/ESP_017196_1455. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena,...
Science.gov Websites
... Province and located at a narrow (2-8 km width), long (40-km), NW-SE oriented valley basin (elevation: 1,500- 1,600-m) with the Tibetan plateau in ...
The Meers Fault is part of a major system of NW-trending faults that form the boundary between the Wichita Mountains and the Anadarko basin in southwestern Oklahoma. The Meers Fault is exposed at the surface over a length of at least 26 km. The fault is c...
National Technical Information Service (NTIS)
... logging data (Upper Albian of the Kirchrode I drill core�Lower Saxony basin, NW Germany). Palaeogeography, Palaeoclimatology, Palaeoecology, ... ...
... 13 FIGURE 3-3. SNOW GEESE DETECTED BY BIRDARTM AT KLAMATH BASIN. ... 1 300 4/7 6:58 17 Snow geese 25 linear 200-300 NW ...
South Carolina Last Updated at 09/04/11 21:00:04 GMT NWSLI Location Description ACQS1 NERRS WATER QUALITY SITE AT ACE BASIN NEAR EDISTO BEACH 10 NW ACXS1 NERRS METEOROLOGICAL SITE...
... a very slight thickening (Fig. 2E). Only some far posterior, single-headed ribs are expanded for their entire length, as those figured by Sun and Li (1985) for B. zigongensis, but generally ... ...
30o 60 o Karoo NW Australia Angola Namibia NE Atlantic W Greenland Brazil Argentina Figure 1. Distri worldwide, for ex- ample the V�ring and M�re basins offshore mid-Nor- way, the Karoo basin (South Africa intru- sive complexes in the Karoo basin. The Karoo ba- sin is very well suited for detailed fieldwork
The Santa Rosa Plain west of the Rodgers Creek-Healdsburg Fault Zone conceals the Trenton Ridge, a long-lived NW-oriented structurally controlled drainage divide separating Windsor basin to the north, from Cotati basin to the south. Thick fills and geometries of these basins combine to amplify seismic shaking and ...
IN THE SANTA MARIA BASIN, NW ARGENTINA MARTIN H. TRAUTH, BODO BOOKHAGEN, ANDREA B. MU� LLER, AND MANFRED R Santa Maria Basin, NW Argentina, are compared with con- ditions during a period of wetter and more with an increase in mass movements. The most effective mechanism to increase landslide activity in this ...
Oxygen isotopic data from 14 sections collected along the northern margin of Tibet show two distinct trends indicative of northward growth of the plateau in the Paleogene followed by basin isolation and growth of local mountain ranges in the Neogene. Our isotopic study encompass many of the large basins found north of Tibet including the Tarim, ...
The Green River Formation in NW. Colorado, NE. Utah, and SW. Wyoming contains thick and extensive deposits of oil shale. The richest oil-shale deposits underlie an area of 12,000 sq km (5,000 sq miles) in the Piceance Creek and Uinta basins in NW. Colorado and NW. Utah. Cashion and Donnel reported that these ...
In recent years, two erupting arc volcanoes in the western Pacific have been extensively studied during a series of cruises led by the NOAA Vents Group. These volcanoes, NW Rota in the Marianas and NW Mata in the NE Lau Basin have provided us with the first opportunities for real-time study of deep undersea eruptions. The eruptive zone ...
A 2700-yr high-resolution pollen record from annually-varved sediments at Sugan Lake in the Qaidam Basin (2793 m a.s.l) was obtained to examine vegetation and climatic change on the NE Tibetan Plateau. Fossil pollen data show that the area was constantly covered by open desert-steppe vegetation dominated by Chenopodiaceae, Artemisia, Poaceae and Ephedra. ...
Basement morphology and sediment distribution with the Yucatan Basin, Caribbean Sea, suggest that it formed as a rift basin. The age of rifting, as determined from heat flow and subsidence measurements is Early Tertiary. Analyses of multichannel and single channel seismic profiles crossing the basin show that it is underlain by a SW-NE ...
Amphibolite-facies felsic gneisses near Dulan, at the southeast end of the North Qaidam terrane, enclose minor eclogite and peridotite. Field relations, and coesite inclusions in zircons from paragneiss suggest that felsic, mafic, and ultramafic rocks all experienced ultra-high pressure (UHP) metamorphism and a common amphibolite-facies retrogression. SHRIMP-RG U-Pb ...
The Himalayan foreland basin is one of the largest and most dynamic terrestrial basins on the earth's surface. It stretches between the syntaxial belt of NW and NE Himalaya and arc southward into the Arabian Sea in the west and the Bay of Bengal in the east. The foreland can be broadly sub- divided into the Gangetic and the Indus ...
The feedbacks between climate, sedimentation, erosion, and deformation are important controls on the growth of orogenic plateaus. We wish to test the two-part hypothesis that (1) formation of internally drained basins is contemporaneous with periods of aridity and the outward propagation of deformation toward the foreland, whereas (2) breaching and erosion of such ...
Cinta and Ardjuna production complexes and related fields describe the main features of W. Java Sea producing formations. A base map shows the Java Sea area between the island of Java and S. Klimantan, and how it has been divided into the Biliton, Sunda, and NW. Java basin. The current offshore production is from fields within 100 miles of the ...
plate, the fast direction of azimuthal anisotropy is trench-parallel in the Ryukyu arc, and oriented NW plate (seafloor ages of around 150 Ma) are subducting beneath the Philip- pine Sea plate along the Izu�Bonin(Ogasawara)�Mariana-Daito ridges; MT, Mariana Trough; PP, Pacific plate; PV, Parece-Vela Basin; SB, Shikoku Basin; WP, ...
The characteristics of ion concentration were studied in snowpit samples collected from the GRHK glacier, the XDKMD glacier and the YZF glacier over the Tibetan Plateau. Samples of snowpits in these three glaciers were analyzed by ion chromatography and ion sources were also explored by correlation analysis. The results indicated that the concentration of Ca2+, Mg2+, Na+, Cl- and SO4(2-) increased ...
The variations in the isotopic compositions of chlorine in evaporation-controlled saline lake brines were determined by using an improved procedure for precise measurement of chlorine isotopes based on Cs2Cl+ ion by thermal ionization mass spectrometry. The results showed that variation in ?37 Cl values in these evaporation-controlled brines are attributable to evaporation of brine accompanied by ...
Sediments from a remote lake of northeastern Tibetan Plateau were analyzed for polycyclic aromatic hydrocarbons (PAHs) and trace metals. USEPA priority PAHs, ranged from 11 in 1860 to 279 ng g(-1) in 2002, while, the deposition fluxes were in the range of 0.2-11.4 ng cm(-2) yr(-1). Similarly, from 1860 to 2002, an increased trend of Hg flux was observed (0.5-3.2 ng cm(-2) yr(-1)). Remarkable ...
Pn arrival time data are collected from the bulletins of both national and regional seismological network in China. These data are tomographically inverted to map the lateral variation and anisotropy of Pn velocity in the northeastern marginal region of Qinghai-Xizang plateau. The average Pn velocity in this region is 8.09 km/s, being a little higher than the average for whole China. Higher ...
We herein present a new seismic refraction/wide-angle reflection profile that crosses the Songpan-Ganzi terrane, the Animaqing suture zone and the eastern Kunlun mountains (comprised of the South Kunlun and Middle Kunlun blocks separated by the Middle Kunlun fault). The profile is 380 km long and extends from Moba to Guide in eastern Tibet. The crustal thickness is about 62 km under the ...
The analyses of the anisotropy of magnetic susceptibility (AMS) in syn-rift deposits from the Northern Iberian plate points out its power in basin analysis and geodynamic reconstructions. The data refer to 99 sites in weakly deformed Triassic red beds, Jurassic and Lower Cretaceous limestones, sandstones and shales from several Mesozoic basins located ...
In active orogens, intermontane basins commonly form adjacent to areas of uplift. The Bieertuokuoyi Basin is an intermontane basin in a rapidly deforming region of NW China. The basin, located in the hanging wall of the Pamir Frontal Thrust, was formed in response to uplift and slip on two ...
Surprise Valley of northeastern California is a major high-angle fault-bounded basin that marks the northwestern margin of the Basin and Range province. On the western margin of the valley, the east-dipping Surprise Valley Fault separates the valley from the Warner Range and accommodates at least 7 km of normal slip. On the eastern margin, a west-dipping ...
Ambient noise tomography is applied to the significant data resources now available across Tibet and surrounding regions to produce Rayleigh wave phase speed maps at periods between 6 and 50 s. Data resources include the permanent Federation of Digital Seismographic Networks, five temporary U.S. Program for Array Seismic Studies of the Continental Lithosphere (PASSCAL) experiments in and around ...
The Pahrump and Mesquite basins are aligned NW-SE along the general trace of the Pahrump Valley-State Line (PV-SL) fault system, presumably forming as pull-aparts due to dextral, transtensional motion along the fault system. These basins have also been inferred to be supradetachment basins that lie near the ...
Sirte Basin is an asymmetrical cratonic basin, situated in the north-central part of Libya. It covers an area of over 350,000km{sup 2} and is one of the most prolific oil-producing basins in the world. Sirte Basin is divided into large NW-SE trending sub-parallel platforms and troughs bounded ...
Fault structure and basin evolution in the northern Aegean Sea and its surroundings have been investigated using bathymetry, available onshore and offshore seismic profiles, onshore fault patterns from NE Greece, NW Turkey, three islands in the Aegean Sea, surface ruptures associated with the, 1978 Thessaloniki earthquakes, GPS measurements from North ...
In the present study we have analyzed 44 Y-chromosome biallelic polymorphisms in population samples from northwestern (NW) Africa and the Iberian Peninsula, which allowed us to place each chromosome unequivocally in a phylogenetic tree based on >150 polymorphisms. The most striking results are that contemporary NW African and Iberian populations were ...
Geologic observations suggest that crustal thickening occurred across Tibet immediately after the onset of the India-Asia collision at 65-55 Ma. Shortening was first concentrated on the plateau margins in the Paleogene (i.e., Qilian Shan and Nan Shan in the north and Gangdese Shan and the Himalayan Tethys in the south). It then expanded to the central plateau (Kunlun and southern ...
The G�lpazar? basin is a rhomb-shaped pull-apart basin that situated on the region between the right-lateral North Anatolian and Eski?ehir fault zones in NW Turkey at an altitude of ~500 m a.s.l. with a size of 12 km in length and 4.5 km in width. The main structural elements controlling the morphological features in and around the ...
The northern Tibetan Plateau consists of the elevated areas from the Kunlun Shan toward the north. This region includes the Qaidam basin and Qilian Shan, and the major bounding structures are the Qilian Shan fault, Altyn Tagh fault (ATF), and Northern Altyn Tagh fault, although deformation occurs beyond these limits in the Tarim basin ...
In the southeastern North Qaidam terrane, near Dulan, high-P granulites (grt + cpx + pl � ky � czo, with variably developed amphibolite-facies overprinting) occur near coesite-eclogite and UHP paragneiss. The granulites lack textural evidence that they represent overprinted UHP rocks, suggesting they may represent a separate tectonic unit. SHRIMP-RG zircon U-Pb ...
The Piceance Basin, a 1,500-sq mile region in NW. Colorado, contains approx. 600 billion bbl of recoverable oil in the form of oil shale. Water is scarce in the area, air quality is precious, and no industry currently is in place. In addition economics of oil shale conversion have not been established. The model presented in this study is a partial ...
Drilling in the Permian Basin increased in all categories during 1972. Exploratory drilling was up 20.1% and development was up 6.8%. Exploratory success declined 1.3% from 1971; whereas the development success rate rose 0.9%. Crude oil production was up 5.43% in 1972 from 1971. This amounts to 37,758,433 bbl. The most active exploration areas were the Delaware ...
Locating on the northwestern margin of the South China Sea, the Qiongdongnan basin is a NE-trending rift zone in general. Bounding with the NW-trending Yinggehai basin and the Red River- East Vietnam Fault Zone to the west, the evolution of the Qiongdongnan basin bears large amounts of information about the slip of ...
Intermontane basins are important repositories for sediment storage, documenting the tectonic, climatic, and sedimentary evolution of orogens in time and space. The Quebrada de Humahuaca in the Southern Central Andes of NW Argentina is an ideal setting to study the evolution of an intermontane depositional environment, which is located within a very narrow ...
observations, inferred major NW�SE dextral Figure 1. Tectonic setting and location map of the West Antarctic Postspreading rifting in the Adare Basin, Antarctica: Regional tectonic consequences R. Granot Scripps] Extension during the middle Cenozoic (43�26 Ma) in the north end of the West Antarctic rift system (WARS
strong reduced velocities extend NE well into the Columbia River Basin (Figures 2b and 2d), ending ROTH ET AL.: 3D SEISMIC VELOCITY STRUCTURE OF NW U.S. L15304 3 of 6 #12;Idaho along the Snake River Plain the Yellowstone- Snake River Plain, and the increased velocity anomalies associated with the Idaho Batholith
ReportedState Location Dates Species Mortality Diagnosis ReportedBy N/A Lake Erie, Entire Basin, Multiple U.S. Counties and Ontario, Canada 10/29/07-12/30/ ... NW ...
along the margins of the fold and the inner, weaker fluvial sandstones and shales. In addition, rivers-day shortening occurs across the Chinese Tian Shan between the NW Tarim basin and southern Kyrgyzstan [Reigber et); Kashi West (KW); Kashi Town (KT); and Kashi North (KN), are indicated as thick black bars. Major river
Lanzhou is one of the major cities in northwest China and the capital of Gansu Province and located at a narrow (2-8 km width), long (40-km), NW-SE oriented valley basin (elevation: 1,500- 1,600-m) with the Tibetan plateau in the west, Baita mountain (abo...
1 Late Neoproterozoic paleomagnetic results from the Sugetbrak Formation of the Aksu area, Tarim Earth hypothesis, paleomagnetic investigations were carried out in the Aksu area of the northwestern with weak anisotropy degrees. A paleomagnetic pole is calculated at 19.1�N, 149.7�E, k = 11.2, A95 = 9
., Kloosterboer-van Hoeve, M.L., Hilgen, F. J., 2000. Refinement of the Messinian APTS from sedimentary cycle succession of the Messinian and Early Pliocene and allow us to reconstruct the tectonic and/or climate variations, in particular prior to, during and following the Messinian salinity crisis. 2. Geological
, Continental rift structures and dynamics with reference to teleseismic studies of the Rio Grande and East from the Rio Grande Rift and adjacent regions of the southwestern United States, Journal of Geophysical of the sedimentary series shows evidence for Carboniferous sedimentation in a basin instead of rifting as previously
Kerogen is the insoluble organic material contained in sediment rock and is formed out of living matter such as algae, bacteria, foliage, and wood in the course of millions of years. The kerogens examined in this study are of marine origin. 75% stem from ...
The faulting and Late Cenozoic crustal stress state on transition zone between Baikal rift system and strike-slip structures in North Mongolia are investigated. Submeridional Khubsugul, Darkhat and Busingol basins are characterized by normal fault setting at initial stage (Late Miocene - Pliocene) with NW-SE orientation of extension axis. The stress state ...
As part of a project that investigated the underwater impacts of the January 12, 2010 earthquake in Haiti, we surveyed offshore structures that may have been activated during that earthquake or that might become activated in future earthquakes. Part of that survey focused on the shallow shelf area that extends north of the segment of the Enriquillo-Plantain Garden fault that just ruptured. This ...
SW Anatolia is located just at the junction of the Hellenic and Cyprus arcs, which are formed boundary between Anatolia and African plate. The Fethiye-Burdur Fault zone, major accident in SW Anatolia, is interprated as on-land continuation of Pliny-Strabo fault system (e.g., eastern boundary of Hellenic Arc). Numerous fault-bounded intramountain basins (e.g., Cameli, Burdur ...
Basins along transcurrent faults have long been of interest as petroleum reservoirs and as markers of transform tectonics. We investigate a class of basins that develop on the transtensional side of fault bends, based on examples along two well-known continental transforms. The Tekirdag (western) and the Cinarcik (eastern) basins in ...
Borehole failure observed on image and dipmeter logs from 55 petroleum wells across the NW Borneo collisional margin were used to determine maximum horizontal stress (?H) orientations; combined with seismic and outcrop data, they define seven tectonic provinces. The Baram Delta-Deepwater Fold-Thrust Belt exhibits three tectonic provinces: its inner shelf inverted province (?H ...
Intramontane sedimentary basins along the margin of continental plateaus often preserve strata that contain fundamental information regarding the pattern of orogenic growth. The sedimentary record of the clastic Miocene Pliocene sequence deposited in the Fiambal� Basin, at the southern margin of the Puna Plateau (NW Argentina), ...
Basin formation dynamics of the Tertiary Piedmont Basin (TPB) are here investigated by means of cross-section numerical modelling. Previous works hypothesised that basin subsidence occurred due first to extension (Oligocene) and then to subsequent loading due to back-thrusting (Miocene). However, structural evidence shows that the TPB ...
The geology of NW. Peru is probably one of the best known in South America. There are 2 basins: in the south, the Talara Basin, and in the north, the Progreso Basin. These 2 basins yield the bulk of Peru's production. More than 9,000 wells have been drilled, the data from which result ...
The Oligocene depositional history of the Thrace Basin documents a unique paleogeographic position at a junction between the Western Tethys and the Eastern Paratethys. As part of the Tethys, shallow marine carbonate platforms prevailed during the Eocene. Subsequently, a three-staged process of isolation started with the Oligocene. During the Early Rupelian, the Thrace ...
The Black Warrior Basin of NE. Mississippi and NW. Alabama is a triangular area of 35,000 sq miles of Paleozoic strata. During most of Paleozoic time, the basin was part of the stable continental interior and received more than 17,000 ft of sediment typical of that deposited in the shallow inland seas of the era. The center of the ...
The N-S elongated extensional Las Vegas basin, southern Nevada, contains 100's of meters of Cenozoic basin-fill sediments that are cut by several Quaternary (Q) faults. These faults define or influence the basin geometry. The basin is generally an asymmetrical half graben defined by the W-dipping, Q Frenchman ...
The Arizaro basin is the largest basin preserved within the Puna Plateau of NW Argentina; it contains ca. 5km of Eocene-Pliocene sedimentary strata of which more than 3km are Miocene fluvial-lacustrine deposits. Previous thermochronologic and sedimentological work document that the deformation front was within the Plateau in the Eocene ...
Dabusun Lake (200 km{sup 2}) is a shallow ({lt}1 m) perennial saline lake in the high altitude Qaidam basin (120,000 km{sup 2}) of western China. It is underlain by {gt}40 m of salt and siliciclastic sediments ({approximately}54,000 years old). Petrographic features in two 50 m cores (chevron halite, halite cumulates, rafts, and siliciclastic mud, minor ...
The Zimbor Formation (ZF), Late Oligocene-Early Miocene, overlies on an area of about 1200 sq km and outcrops in the NW Transylvania Bazin, Romania. The ZF is divided into two members: lower member consisting of fine-dominated sediments, and upper member consisting of detrital-dominated sediments with several coal levels. This study include a series of stratigraphic logs ...
Cumulative production of oil from fractured shale is 3% of that from all formations in Colorado and 11% in N.W. New Mexico. Thick cretaceous shales are widespread in the region and contain oil-filled void fractures in 3 districts, the front range flank, N.W. Colorado, and the rim of the San Juan basin. In contrast to conventional ...
The opening of the South China Sea has been a matter of debate for many years because of its internal structure, the differences between the conjugate margins and the variations of rifting and spreading directions. Although it is considered as being a back-arc basin, it is not sitting directly above a subduction zone, and the rifting process lasted for an unusually long ...
Hornblende and biotite /sup 40/Ar//sup 39/Ar age spectra from rocks in south-central Connecticut help define a Permian-Triassic cooling curve for the area. Together with petrologic and structural information, a time-temperature-pressure-strain path is established. Similar data for the Narragansett basin in Rhode Island and Massachusetts allow correlation of the late Paleozoic ...
This work deals with anisotropy of the magnetic susceptibility (AMS) and the study of brittle mesostructures of the inverted extensional Organy� basin (Central Southern Pyrenees). Separation of magnetic subfabrics (analyses of AMS at low temperature and anisotropy of the anhysteretic remanence -AARM-) has been also done to properly interpret the obtained AMS data. The ...
We investigate long-period (> 2 s) ground motions in the Georgia basin region of SW British Columbia (BC) for intra-slab earthquake scenarios using 3D finite-difference simulations of viscoelastic wave propagation. The Georgia basin is a site of concentrated deep (25-80 km) Juan de Fuca plate seismicity in a region with over 2 million inhabitants and ...
Major discrepancy between present-day fault models in the Marmara Sea is closely related to structural development of depression areas beneath the sea. Therefore, in this study, the Marmara Sea and especially its major basins are investigated by means of recent seismological observations consisting of microseismicity (1.2 ?Md? 3.6; 2002 May-2006 May), focal mechanisms (2.4 ...
The present distribution of unmetamorphosed sedimentary cover sequences in the central Fennoscandian Shield potentially reflect either original basin configuration or selective preservation of originally more extensive strata. The central Fennoscandian Shield is bordered by the Sveconorwegian (ca. 1100-900 Ma) and Caledonian (ca. 450-350 Ma) orogenic fronts in the SW, W and ...
Oil has been found in Mississippian age rock for the first time in the San Juan Basin of NW. New Mexico. Although the discovery began going to water shortly after being put on production, the well has attracted interest to deeper horizons of the basin. Petroleum Energy, Inc., drilled the discovery, Navajo 1-5, in 5-26n-19w, San Juan ...
Exploratory and development drilling in E. and NW. Colorado in 1971 was up from 1970 and Colorado was the most active state in the Rocky Mt. area. Colorado oil production was up more than 4%. Significant exploratory wells were completed in the Denver Basin, North Park Basin, Sand Wash Basin, and on the Las Animas ...
Digitally-filtered Bouguer gravity anomaly maps of the Floridan Plateau delineate the Mesozoic extensional basins in the southwestern half of the plateau and suggest modification of existing basement models. The extension into Florida of the Triassic South Georgia Rift is marked by a gravity low and appears to have small ancillary rift basins paralleling ...
Natural gas production and utilization began just prior to World War I. Production is from more than 50 fields within an area of about 1,200 sq miles and mainly from upper Miocene and lower Pliocene clastic sedimentary rocks. In the Los Angeles basin, natural gas is produced with oil and, therefore, gas production is limited by both the gas-oil ratio and the ability of ...
Potential source rocks in the string of basins on the Atlantic Margin north and west of Britain and Ireland range in age from Devonian to Tertiary, although the Jurassic appears to have been effective. In the Palaeozoic, thick developments of lacustrine Type I kerogen rich shales occur in the Lower and Middle Devonian of the Orcadian Basin in northeast ...
This study provides the first evidence of the sources and loads of perfluorochemicals (PFCs) to the NW Mediterranean Sea. Five PFCs were analyzed in 45 seawater samples collected along the Catalan coast. Total PFCs ranged from 0.07 to 13.0 ng/l, being the levels higher in ports than in coastal waters. To determine the sources of PFCs, 8 wastewater treatment plants (WWTPs) ...
The ?oka structure is a fault-bounded anticline in northern Banat, in the southern part of the Neogene Pannonian Basin. The structure and its vicinity were explored by 24 wells. In addition to well logs, paleontological, sedimentological and petrological analyses of cores and 27 seismic sections with different parameters of acquisition and processing were used for geological ...
During mid-Oligocene to early-Miocene times the northeastern Afro-Arabian plate underwent changes, from continental breakup along the Red Sea in the south, to continental collision with Eurasia in the north and formation of the N S trending Dead Sea fault plate boundary. Concurrent uplift and erosion of the entire Levant area led to an incomplete sedimentary record, obscuring reconstructions of ...
The Edremit Gulf, which developed during the Neogene-Quaternary, is a seismically active graben in NW Anatolia (Turkey) surrounded by the Sakarya continent. The sedimentary deposits in the gulf overlie the bedrock unconformably and can be separated into two parts as upper and lower deposits based on similarity of their seismic characteristics, and because the contact between ...
Reconstruction of late Quaternary sea level history in areas of glacioisostatic uplift often relies on sediment archives from coastal isolation basins, natural coastal rock depressions previously isolated from or connected to the sea at different times. Proxy indicators for marine, brackish, or lacustrine conditions combined with precise dating can constrain the time when the ...
Gravity and magnetic maps have been interpreted and integrated with geological observations to investigate the linkage between deep sub-salt basement and shallow structures imaged seismically in the Mesozoic-Cenozoic marine section of southeast Texas. Shallow structures could have been inherited from sub-salt basement; e.g. shallow anticlines imaged below a detachment which approximately ...
The Norwegian Atlantic Current (NwAC) and its eddy field are examined using data from surface drifters. The data set used spans nearly 20 years, from June 1991 to December 2009. The results are largely consistent with previous estimates, which were based on data from the first decade only. With our new data set, statistical analysis of the mean fields can be calculated with ...
Numerous works have reported in the past the presence of a possible seismogenic fault (the Padul Fault) potentially able to trigger strong earthquakes in the Tablate area, in between the western periclinal termination of the Sierra Nevada (Betic Codillera) and the southern termination of the Granada intramontane Basin (Spain). This seismogenic structure is an extensional fault ...
Located on the Humboldt Plate, just N of the San Francisco Bay block, the Santa Rosa Plain (SRP) is a NW- oriented dissected lowland ~60 km long by 12 km wide, underlain by fault bounded Neogene basins containing syntectonic sedimentary and volcanic fills up to 2.5 km-thick. In response to lengthening of the transform margin ~7 to 5 Ma, Neogene strata now ...
A Gram reaction-positive, moderately halophilic bacterium, designated H57B72(T), was isolated from subsurface saline soil of Qaidam basin in the Qinghai province, China. Cells were rod-shaped, strictly aerobic, spore-forming and motile. The isolate grew optimally at 9?% (w/v) NaCl, pH7.5 and 30�C. The cell-wall peptidoglycan of strain H57B72(T) contained ...
A Gram-stain-positive, rod-shaped, non-sporulating, motile and moderately halophilic bacterium, designated strain H96B60(T), was isolated from a saline soil sample of the Qaidam basin, China. The strain was facultatively anaerobic. Major end products formed from glucose fermentation were acetate, ethanol and lactic acid. The cell-wall peptidoglycan ...
Data from recent INDEPTH IV and other broadband deployments in Tibet are used to invert for crustal delays and Pn velocities beneath the eastern Tibetan Plateau and surrounding regions. The station delays show the thickest crust is beneath Tanggula Shan in central Tibet, a significant decrease of crustal thickness in the northeast plateau, and a thin crust beneath the Ho-Xi corridor that lie north ...
In preparation for the Magnetotelluric (MT) Phase IV of the INDEPTH (International Deep Profiling of Tibet and Himalaya) project, focusing on the northern margins of the Tibetan plateau, MT data from the Phase III 600-line were re-analyzed and re-modelled. Previous inversions of the data from the 600-line used the MT TE-mode, TM-mode and vertical magnetic field data to derive minimally smooth ...
It is unclear whether the shift in leaf traits between species of high- and low-rainfall sites is caused by low rainfall or by species replacement, because leaf traits vary substantially among species and sites. Our objective was to test if the within-species relationship between specific leaf area (SLA) and leaf N concentration (N(mass) ) shifts across a rainfall gradient in the semi-arid sandy ...
The northeastern boundary of the Tibetan Plateau is a new focus of contemporary debate concerning continental plateau formation as an continent-continent collision. Recent geological studies and limited geophysical measurements in this region have been cited to argue that Asian continental lithosphere is being detached and 'subducted' into the Tibetan mantle. Upper mantle geophysical properties ...
During the INDEPTH (International Deep Profiling of Tibet and Himalaya) project Phase III surveys in 1999, broadband and long period magnetotelluric (MT) data were collected in Northern Tibet across the Kunlun Fault. The MT stations, placed along the northern part of the Lhasa to Golmud highway, defined the so-called 600-line profile extending from the middle of the Qiangtang Terrane to the ...
Lithic photoautotrophic communities function as principal primary producers in the world's driest deserts, yet many aspects of their ecology remain unknown. This is particularly true for Asia, where some of the Earth's oldest and driest deserts occur. Using methods derived from plant landscape ecology, we measured the abundance and spatial distribution of cyanobacterial colonization on quartz ...
P wave and S wave receiver functions have been extracted from the data of Indepth-IV passive seismic arrays in Northern Tibet. Using different processing methods, including slant-stack, migration and CCP, we imaged the geometry of Moho, LAB and the mantle transition zone. Two north-south profiles show a stepwise Moho geometry, stepping down to the south, with two sharp offsets beneath the Jinsha ...
Externally drained intermontane basins in tectonically active mountain belts often act as areas of sediment storage that buffer the transfer of sediment from the orogen interior to the foreland. As such, they may serve as important recorders of the deformation and erosion within orogens. The timescales associated with sediment filling and excavation of such ...
It is well known that there are two patterns of potash deposition in lacustrine facies: �tear drop pattern� (the Dabsan saline lake is a typical example) and �bull's eye pattern�. Potash-forming in tear drop pattern is still continuing. The 2,678 m A. S. L. lake in the middle of the Qarhan playa in the Qaidam Basin covers an area of 210 km2, and ...
Broadband three component data from a number of large new two dimensional seismic arrays in eastern Tibet present a unique opportunity to improve our knowledge of the seismic structure of lithosphere and upper mantle beneath the largest continental plateau on the planet. Using differential travel-times of teleseismic body waves recorded by these seismic networks in Tibet, we carried out ...
SinoProbe Project is a five-year (2008-2012) Chinese National Special Project to use exploration geophysical methods to image the deep structure of continental China. The Tibetan Plateau is one of the most important probing areas including three main profiles: A, B, C, and two accessory profiles: D and E. Three main seismic methods, deep reflection profile (CMP), deep seismic sounding (DSS) and ...
We investigate the frequency dependent attenuation tomography of regional seismic phases Lg and Pg. The intrinsic attenuation of Lg and Pg is employed as an approximation of Qs and Qp in the crust and used as a constraint in interpretation of crustal geothermy, rheology and tectonics. We have generated tomographic images with the best resolution to observe structures as small as 100km2. We applied ...
The Mahanadi Basin is a NW-SE stretching Gondwana basin perpendicular to the east coast of India. The metamorphic basement to the basin mainly comprises rocks of the Eastern Ghats Mobile Belt (EGMB) which experienced a complex thermotectonic evolution involving several episodes of deformation and magmatism. It can ...
Geologically, the Oklahoma Panhandle is situated along the NW. flank of the Anadarko Basin and separates the Dalhart Basin from the Hugoton Embayment of the Anadarko Basin. This is a geographic separation rather than a tectonic separation. As a result, the Panhandle has been subject to a ...
The drainage basin of Mirror Lake, New Hampshire is characterized by high knobs and ridges and steep land slopes. The lake is situated in the lower part of the basin, largely within glacial drift. Drift in most of the Mirror Lake drainage basin is till, which is as much as 50 meters thick, Crystalline bedrock underlying the drift is ...
USGS Publications Warehouse
Exploratory wells were drilled in all but 9 counties of Oklahoma during 1966. The concentration of discoveries, extensions, outposts, and new pay horizons was in NW. Oklahoma in Beaver, Ellis, Roger Mills, Woods, and Woodward Counties. This area had a 40% success ratio, whereas the state-wide success ratio was 28% for exploratory wells. Tonkawa completions were the most ...
Methane-derived rocks in Monferrato and the Tertiary Piedmont Basin (NW Italy) consist of seep carbonates, formed by gas seepage at the seafloor, and macroconcretions resulting from the cementation of buried sediments crossed by gas-rich fluids. These rocks are characterized by both negative ?13C values and a marked enrichment in ?18O. Petrographic ...
We interpret the cratonic Congo basin, a large circular �Cuvette Centrale� filled with up to 9 km of Proterozoic to Neogene sediments, as the consequence of a Neo-Proterozoic rift. Firstly, the magnitude and the long-term subsidence are consistent with the thermal time-constant of a 200-250 km thick lithosphere inferred from several tomographic studies. Secondly, the ...
A thick sequence of Late Miocene to Pleistocene sediments thought to represent deposition in a Neogene forearc basin are preserved in the structural basin referred to as the Eel River basin' located offshore of NW California and SE Oregon. The southern portion of this structural basin ...
In this work we analyse and check the results of anisotropy of magnetic susceptibility (AMS) by means of a comparison with palaeostress orientations obtained from the analysis of brittle mesostructures in the Cabu�rniga Cretaceous basin, located in the western end of the Basque Cantabrian basin, North Spain. The AMS data refer to 23 sites including ...
On the southern margin of the Puna Plateau, active normal and strike-slip faults accommodate N-S extension, overprinting earlier NW-SE and NE-SW shortening. These relationships, noted elsewhere by other researchers, can be seen north of the Fiambala Basin at the intersection of the plateau, the Cordillera Principal and the northwestern Sierras Pampeanas ...
The study area includes N. Seminole County and portions of Pottawatomie and Okfuskee counties, which are in the Greater Seminole District of central Oklahoma and in the NW. part of the Arkoma Basin. The subsurface stratigraphy, structure, and conditions of oil accumulation of Desmoinesian and older rocks in the Seminole Area are discussed. Subsurface ...
For the region studied in the eastern range of the Andes between 22� S and 25� S (northwestern Argentina), the Cambrian transgression produced thick quartz arenite series and is described as a coastal, tidal and subtidal influenced process. Lithology, sedimentology and the spatial distribution of the facies types made a model of enclosed extended platform or basin areas ...
Exploratory and development wells drilled in E. and NW. Colorado in 1974 were up 17% from 1973; the success ratio increased from 42.6% in 1973 to 50.9% in 1974. Exploratory drilling was down 15.4%, but development drilling increased 65.2%. During 1974, 323 exploratory tests were drilled in Colorado and, of these, 25 found oil and 24 found gas. Development drilling was ...
The operational meteo-hydrological forecasting chain of the Liguria Region (NW Italy) is applied to a different morphoclimatic environment, such as the Emilia Romagna Region (N Italy). Modification to the chain, both in models and in procedures, are introduced to overcome problems related to medium dimension catchments (A?1000km2), characterized by complex altimetry profiles ...
The margins of the deep-water sedimentary basins west of Ireland contain a number of large clusters (provinces) of spectacular carbonate mounds and build-ups. These basins have a complex development history involving the interplay of rift tectonics, thermal subsidence, igneous activity and oceanographic variations. The Porcupine and Rockall ...
Sedimentary sequences within basins along and within the southern margin of the Puna Plateau, Northwest Argentina, record the completing influences of tectonics and climate on exhumation and deposition in this dynamic region. The basins contain Mio-Pliocene fluvial-lactustrine strata, which are capped by distinctive proximal alluvial-fluvial conglomerates ...
We collected three m-long piston cores of mud during the Kairei cruise (KR04-08 and KR05-10) of Japan Marine Science and Technology Center in 2004 and 2005 from the NW Pacific between Honshu and Shatsky Rise; aside the Fukahori Knoll and Yukawa Knoll. Another set of mud cores, 234.5 m long, was collected during the JOIDES Resolution cruise (IODP Exp308, site U1322) in 2005 ...
The Mw8.0, Wenchuan earthquake, which devastated the mountainous, western rim of the Sichuan basin in central China on May 12th, 2008 produced a surface rupture at least 225 km-long, with oblique thrust/dextral slip and maximum slip of 8-10m. It thus ranks as one of the world's largest continental mega- thrust events in the last 150 years. Field investigation shows clear ...
Widespread deposition of organic-carbon-rich marine sediments during the Oceanic Anoxic Events (OAEs) is a distinct feature of the Cretaceous ocean that was intrinsically linked to periods of extreme oxygen-depletion in the water column. High-resolution geochemical and biofacial records from the southern proto-North Atlantic including the NW-African shelf have recently become ...
A modified caving method is introduced for mining oil shale and simultaneous restoration of the land surface by return of spent shale onto the subsided area. Other methods have been designed to mine the relatively thin richer beds occurring near outcrops in the Piceance Creek Basin of NW. Colorado. Since the discovery of the much thicker beds in the ...
The Late Cretaceous (Maastrichtian) to Recent sedimentary record of NW Syria documents the palaeoenvironments and regional tectonic setting during a time when the Neotethys ocean to the north was closing, culminating in regional collision by mid-Miocene time. This detailed sedimentological study builds on a biostratigraphical framework established by Russian workers. During ...
The most significant areas of exploration drilling and development were the offshore NW. shelf of W. Australia, and continued development drilling in the Bass Basin of Victoria in SE. Australia. On shore, the most active area was the Cooper Basin of S. Australia where several gas-bearing structures were discovered. Overall, drilling ...
The magnetic fabric of Late Miocene sediments from the southern Pannonian basin was studied on oriented samples collected from 19 geographically distributed localities. All of them are characterized by near-horizontal magnetic foliation plane after tilt correction, indicating weak deformation. Well-developed lineations were observed for 16 localities, which are interpreted as ...
The Lau basin is a back-arc spreading center behind the Tonga arc in the western Pacific. Northeast of the subduction system is the Samoan plume, which is hypothesized to be migrating into the NW Lau basin through a tear in the subducting plate. Previous studies, using He isotopes as a tracer of the distinctive Samoan mantle ...
The High Pressure Area of Blaine and Canadian counties, NW. Oklahoma, has become one of the major Morrow gas reserves of the Anadarko Basin since 1960. The Atoka, Morrow and Springer sands, of the Lower Pennsylvanian and Upper Mississippian age, referred to as Morrow in this paper, are stratigraphically trapped in their updip position in the Anadarko ...
The Eocene Green River Formation of the western U.S. holds one of the largest known deposits of oil shale on earth. The richest and thickest beds are located in the Piceance Basin of NW. Colorado. Potential yields in excess of 10 gal per ton are common, and some of the beds exceed 45 gal per ton. The center of the basin contains over ...
The Breedlove field is in NW. Martin County, Texas, approx. 30 miles north of Midland. The field is only a few miles east of the axis of the Midland Basin and on the E. flank of the ancient Tobosa Basin. Stratigraphically, the field is northeast of the limit of Devonian carbonate deposition and the Silurian carbonate section has a ...
The submarine Anaximander Mountains connect the Hellenic and Cyprus Arcs and form a zone that accommodates the different tectonic regimes along these arcs. The Lycian Tauride Mountains in southwestern Turkey are situated just north of the Anaximander Mts. and likely have a comparable neotectonic evolution. The Lycian Taurides comprise the Bey Daglari positioned between the Lycian Nappes in the ...
When a continent breaks up into two plates, which then separate from each other about a rotation pole, it can be shown that if initial movement is taken up by lithospheric extension, asthenospheric breakthrough and oceanic accretion propagate toward the pole of rotation. Such a propagating rift model is then applied to an embryonic centrally located rift which evolves into two rifts propagating in ...
Extensional provinces terminate along-strike where extension dissipates to zero, at transform faults, or at triple junctions. Termination of the northern Basin and Range province in western North America has long been thought to be controlled by an intracontinental transform fault, the Brothers Fault zone (BFz). New mapping in the boundary region between a major ...
Low-temperature thermochronology was applied at the Brazilian passive continental margin in order to understand and reconstruct the post-rift evolution since the break-up of southwestern Gondwana. Thermochronological data obtained from apatite fission-track analysis of Neoproterozoic metamorphic and Paleozoic to Mesozoic siliciclastic rocks as well as Mesozoic dikes and alkaline intrusions from ...
Low-temperature thermochronology was applied at the Brazilian passive continental margin in order to understand and reconstruct the post-rift evolution since the break-up of southwestern Gondwana. Thermochronological data obtained from apatite fission-track analysis of Neoproterozoic metamorphic and Paleozoic to Mesozoic siliciclastic rocks as well as Mesozoic dikes from the Ponta Grossa Arch ...
The geology of the wide shelves surrounding the South Atlantic is closely linked to the kinematics and history of the opening of the ocean. However, several wide sedimentary basins, which developed along the margins show peculiarities that are not yet understood in the context of the evolution of the South Atlantic. The Colorado Basin, a wide sedimentary ...
In the Williston Basin five regional seismic profiles, covering �3090 km were utilized for a comprehensive study of this complex geologic feature. 2300 km field data were added to the existing 790 km profile. The novel seismic information in conjunction with a sizeable number of wireline data and incorporation of structural and isopach maps provided a unique data environment ...
On some fundamental level, changes in the distribution of land and mountains lead to changes in Earth's climate. Relating climate change to tectonic events remains a challenge, however, in part due to a lack of understanding of modern and past climates and the scarcity of climate and tectonic records. This thesis contains studies of climate and tectonics in two geographic areas: the Tibetan ...
Recent studies have revealed that uplift of the Tibetan plateau may be related to removal of lithospheric mantle and resulting emplacement of hotter, less dense asthenospheric material. In addition to these modes of deformation, other studies have proposed that plateau uplift and crustal thickening have occurred through a process of lateral crustal flow. In order to study the evolution and ...
The Junggar Basin of northwestern China, often considered to be the southeast extremity of the Kazakhstan Block, sits in a complicated region squeezed between the Tarim Basin on the south, the Kazakhstan Block on the west, and Siberia to the northeast. New paleomagnetic data from several Late Jurassic and Middle Carboniferous rock units from the Junggar ...
Structural and depositional setting, coal rank, gas content, permeability, hydrodynamics, and reservoir heterogeneity control the producibility of coalbed methane in the Piceance Basin. The coal-rich Upper Cretaceous, Williams Fork Formation is genetically defined and regionally correlated to the genetic sequences in the Sand Wash Basin, to the north. Net ...
Lake Ohrid Basin is a graben structure situated in the Dinarides at the border of the Former Yugoslavian Republic of Macedonia (FYROM) and Albania. It hosts one of the oldest lakes in Europe and is characterized by a basin and range-like geological setting together with the halfgraben basins of Korca, Erseka and Debar. The ...
