Entry_ID: (required) Entry_Title: Whole Rock Geochemical Data For Paleozoic Sedimentary Rocks of the western Brooks Brooks Range, Alaska Group: Data_Set_Citation Originator(s): John F. Slack; Jeanine M. Schmidt; Julie A. Dumoulin Title: Whole Rock Geochemical Data For Paleozoic Sedimentary Rocks of the western Brooks Brooks Range, Alaska Publication: U.S. Geological Survey Open-File Report Publication_Date: 2004 Publication_Place: Reston, VA Publisher: U.S. Geological Survey Data_Presentation_Form: table URL: http://pubs.usgs.gov/of/2004/1371/ End_Group Keyword: geochemistry Keyword: rocks and deposits Keyword: mass spectroscopy Keyword: neutron activation analysis Keyword: atomic absorption analysis Keyword: chemical analysis Keyword: Kuna Formation Keyword: Lower Siksikpuk Formation Keyword: Noatak Sandstone Group: Temporal_Coverage Start_date: 2004 Stop_date: 2004 End_Group Data_Set_Progress: Complete Group: Spatial_Coverage Southernmost_Latitude: 63.381070 Northernmost_Latitude: 68.634480 Westernmost_Longitude: -163.899950 Easternmost_Longitude: -151.864400 End_Group Location: 02188 = Northwest Arctic Group: Data_Resolution End_Group Access_Constraints: none Use_Constraints: none Originating_Center: (required) Group: Data_Center Data_Center_Name: USGS Information Services Dataset_ID: USGS Open-File Report 2004-1371 Group: Data_Center_Contact Last_name: USGS Information Services First_name: N/A Email: ask@usgs.gov Phone: 1-888-ASK-USGS Group: Address Box 25286 Denver Federal Center Denver, CO 80225 USA End_Group End_Group End_Group Storage_Medium: Microsoft Excel Group: Distribution Distribution_Media: online Distribution_Format : Shapefile Distribution_Size: 34 kilobytes Fees: none End_Group Group: Distribution Distribution_Media: online Distribution_Format : Microsoft Excel Distribution_Size: 185 kilobytes Fees: none End_Group Group: Multimedia_Sample URL: http://pubs.usgs.gov/of/2004/1372/reddog.png Format: PNG Group: Description Index map showing general location of the study area, 790x570 pixels, 53k bytes End_Group End_Group Group: Reference Citation_Information: Originator: John F. Slack Originator: Karen D. Kelley Originator: Jeffrey L. Clark Publication_Date: 2004 Title: Whole rock geochemical data for altered and mineralized rocks, Red Dog Zn-Pb-Ag district, western Brooks Range, Alaska Geospatial_Data_Presentation_Form: table Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2004-1372 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2004/1372/ End_Group Group: Summary These data form the basis for a study by Slack et al. (2004a) on the provenance and depositional history of the Paleozoic strata, and on their metallogenic significance relative to the formation of large stratabound Zn-Pb-Ag deposits in the Red Dog mining district. This report presents geochemical analyses for 210 unaltered and unmineralized rock samples of Paleozoic age in the western Brooks Range of northern Alaska. These data form the basis for a study by Slack et al. (2004a) on the provenance and depositional history of the Paleozoic strata, and on their metallogenic significance relative to the formation of large stratabound Zn- Pb-Ag deposits in the Red Dog mining district. Principal rock types that were analyzed include shale, siltstone, sandstone, chert, bedded siliceous rock, and calcareous radiolarite; selected samples of limestone, phosphate, and argillite, and one siderite concretion, were also analyzed. Note that the phosphate samples are from the central Brooks Range, east of the Red Dog district. The geochemical analyses are presented here in Microsoft Excel and .dbf spreadsheet formats in order to facilitate calculations and plotting of data. A related geochemical database on altered and mineralized rocks in the Red Dog Zn-Pb-Ag district is available in Slack and others (2004b). Data for elements, oxides, and other components are presented either in weight percent or parts per million, except for Au and Pd that are in parts per billion. Qualified values (shown by the '<' symbol) represent values less than the specified minimum detection limit (MDL). In some cases, the MDL for a particular element or component is not uniform, which reflects changing analytical conditions or matrix effects, or use of newer ICP-MS instruments that have higher precision and lower MDLs. For statistical treatment of data and other calculations, it is recommended that qualified values be substituted by one-half the analytical detection limit (Sanford and others, 1993). Note that the abbreviation "n.a." refers to a lack of analysis for the specified element or component. Values for the magnitude of the Ce and Eu anomalies are also presented. The magnitude of the Ce anomaly, Ce/Ce*, is calculated as: Ce[CN]/((La[CN])**0.667 * (Nd[CN])**0.333) where Ce[CN], La[CN], and Nd[CN] represent normalization of Ce, La, and Nd respectively to average chondrites using the data of Nakamura (1974). The magnitude of the Eu anomaly, Eu/Eu*, is calculated as: Eu[CN]/(Sm[CN]*Gd[CN])**0.5 with chondrite normalization of Eu, Sm, and Gd represented respectively as Eu[CN], Sm[CN], and Gd[CN]. For those samples without ICP-MS analyses for Gd, the Eu/Eu* values were calculated by a curve-fitting Excel macro program using INAA data for La, Ce, Nd, Sm, Eu, Tb, Yb, and Lu. In these formulae, two asterisks (**) are used to represent exponentiation; one alone indicates multiplication. End_Group Group: Related_URL URL_Type: URL: http://pubs.usgs.gov/of/2004/1372/ Group: Description Originator: John F. Slack Originator: Karen D. Kelley Originator: Jeffrey L. Clark Publication_Date: 2004 Title: Whole rock geochemical data for altered and mineralized rocks, Red Dog Zn-Pb-Ag district, western Brooks Range, Alaska Geospatial_Data_Presentation_Form: table Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2004-1372 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2004/1372/ End_Group End_Group Group: DIF_Author Last_name: Schweitzer First_name: Peter Middle_name: N. Email: mailto:pschweitzer@usgs.gov Phone: (703) 648-6533 Group: Address Mail Stop 954 National Center U.S. Geological Survey 12201 Sunrise Valley Drive Reston, VA 20192 USA End_Group End_Group DIF_Revision_Date: 20041021 Science_Review_Date: