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Metadata
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ID
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W-1-05-SC
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Also Known As
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MBARI T783 to T808
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Abstract
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Monterey Bay Aquarium Research Institute,United States
Geological Survey, Menlo Park, California. Chief Scientist:
Charlie Paull. Dive and Sampling data (navigation) of field
activity W-1-05-SC in Santa Monica Basin, California
Continental Borderland from 02/09/2005 to 02/18/2005
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Organization
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Monterey Bay Aquarium Research Institute
United States Geological Survey, Menlo Park, California
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Chief Scientist
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Charlie Paull
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Activity Type
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Dive and Sampling
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Platform
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Western Flyer
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Area of Operation
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Santa Monica Basin, California Continental Borderland
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Location map
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Bounding Coordinates
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34.07751
-119.27467 -118.49214
33.75354
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Ports
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LEAVE Moss Landing, CA
ARRIVE Port Hueneme, CA
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Dates
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02/09/2005 (JD 040) to 02/18/2005 (JD 049)
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Analog Materials
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list
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Index map
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Information Specialist
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Crew
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Charlie Paull
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Bill Ussler
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Rendy Keaten
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Patrick Mitts
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Doug Conlin
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Bill Normark
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Jennifer Dougherty
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Lori Hibbeler
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Tzvetie Erohina
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Husen Zhang
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Buck Reynolds
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Dave French
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Randy Pricket
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Brian Schaefer
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Buzz Scott
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Darrell Palmer
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Patrick Duffy
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Eric Thunstrom
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Tim McLaughlin
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Derek Greenwood
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Lance Wardle
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Jim Bombaci
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Dan Chamberlin
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Dan Camp
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Dan Benvenuti
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Equipment Used
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Purpose
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(1) Three ROV dive days were planned to
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revisit USGS methane hydrate discovery on mud volcano 25 km west of Redondo
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Beach, CA. and map the summit area and surrounding seafloor of the 20-m-high
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mud volcano. Plans include sampling with vibracores, push cores, collecting
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fluid and gas samples and collecting living chemosynthetic biological
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communities (CBC) organisms. In addition, these dives would utilize a thermal
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probe for heat flow measurements.
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(2) Six dive days were planned in the local canyons, two each in Hueneme,
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Santa Monica, and Redondo canyons. The primary MBARI objective of these dives
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was to determine the recent sediment transport activity in each of these
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canyons with specific attention to tracking DDT residues. In addition, the
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USGS project interests were to determine the stratigraphy of the canyon walls.
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Dive sites were based on USGS multibeam bathymetry and high-resolution
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reflection profiles and were planned as transects across the lower canyon i
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proximal fan area in water depths from 300 to ~750 m in the narrow incised
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part of the canyon. The intention is to collect vibracore and push core along
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transects across the center of the axial channel and up the adjacent canyon walls.
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Information to be Derived
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ROV Tiburon and CTD/rosette sampler (all MBARI
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equipment). Tiburon will be used to map and sample the sea floor (see Purpose
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and Goals above). The CTD/rosette sampler is for detection of methane gas in the water column.
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Extensive sea-floor video coverage to identify benthic fauna, active methane
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gas vents, etc. Sediment samples will be used for pore-water chemistry,
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hydrocarbon gas content, microbiological studies, isotopic age determinations,
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stable-element isotopic studies, benthic-foraminifera populations, and
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sediment stratigraphy (for canyon/fan channel dive sites).
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Summary
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1400/JD040 R/V Western Flyer departs Moss Landing.
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~2000/JD040 Begin test of CTD/rosette sampler in upper Partington Canyon (MBARI operation)
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2130/JD040 depart Partington Canyon station; begin transit to Santa Monica Basin
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0630/JD041 On station for the first ROV dive of the expedition TIBURON Dive T-783 in Hueneme Canyon, Santa Monica Basin..
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2218/JD049 Complete final ROV Dive T808, also in Hueneme Canyon.
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The Western Flyer arrives in Port Hueneme at 0110/JD050.
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Refer to the Operation Log for details.
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A total of 26 TIBURON ROV dives were completed by the end of the nine-day operation
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on JD050. Of these dives, 5 were at the mud volcano or the alternate hydrate
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site, 9 were in Hueneme canyon or fan valley, 6 were in Santa Monica canyon or
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fan valley, 5 were in Redondo canyon or fan valley, and 1 was on the upper
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basin slope northwest of the head-scarp area of the Palos Verdes debris
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avalanche. During these dives, 55 vibracores were obtained that will come to
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the USGS for MST logging, photography, and description and probable archiving.
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Other cores that will come to the USGS are 30 vertical push cores that will be
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logged before splitting for photography and description. Cores not saved in
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their original polycarbonate core liners include 44 horizontal push cores,
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which were taken from vertical or near-vertical outcrops, and several samples
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from vertical push cores whose upper sections were sampled for geochemical
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analyses. The latter two sample types are stored in plastic ziplock bags.
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All primary objectives of the cruise were attained. The hydrate site at the
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mud volcano was examined and mapped, and active methane gas seeps were
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successfully sampled. A secondary site for this objective also proved to have
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active seeps supporting a large area of chemosynthetic vent-specific bivalves.
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The submarine canyon dives obtained samples that will be used to determine
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the cut and fill history of the canyons and the late Holocene depositional
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activity on their associated submarine fans.
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Notes
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(1) Station IDs reflect the Tiburon dive numbers set by MBARI.
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(2) Sample numbers are generally not consecutive but reflect permanent labels
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on coring and other devices that are randomly chosen before each dive, and
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many of the push cores are reused in later dives. USGS sample protocol could
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not used during dives except for the Activity ID (W-1-05-SC).
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(3) Sample numbers recorded in FACS reflect only those samples that will be
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brought to the USGS for logging, description, and, in most cases, archiving.
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(4) Water samples collected by CTD/rosette sampler are generally not entered in FACS log because samples are processed on board for MBARI program and for Lorenson project.
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Got Help?
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For W-1-05-SC, we would appreciate any information on -- contract, days at sea, dive count, funding, kms of navigation, national plan, NGDC Info, owner, project, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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