Metadata: Identification_Information: Citation: Citation_Information: Originator: Nancy G. Prouty Publication_Date: 2016 Title: Geochemical analysis of authigenic carbonates and chemosynthetic mussels at Atlantic Margin seeps (ver. 2.0, March 2019) Edition: 2.0 Geospatial_Data_Presentation_Form: tabular data in .xlsx format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F77942SJ Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F77942SJ Online_Linkage: https://www.sciencebase.gov/catalog/file/get/57a3c016e4b0d7d7d7af97c1 Description: Abstract: Isotopic analyses of authigenic carbonates and methanotrophic deep-sea mussels, Bathymodiolus sp., was performed on samples collected from seep fields in the Baltimore and Norfolk Canyons on the north Atlantic margin. Samples were collected using remotely operated underwater vehicles (ROVs) during three different research cruises in 2012, 2013, and 2015. Analyses were performed by several different laboratories, and the results are presented in spreadsheet format. Purpose: These samples were collected and analyzed as part of an effort to determine the origin and age of methane seeps along the north Atlantic margin, within an area of newly discovered venting. Supplemental_Information: Additional information about the field activities during which the 2012 and 2013 samples were collected is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=F0112MC http://cmgds.marine.usgs.gov/fan_info.php?fan=B0413MC Samples from 2015 were collected by Dr. Cindy Van Dover from Duke University (http://oceanography.ml.duke.edu/vandover/people/about/) during one of their research cruises, and as such, no USGS field activity information exists. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20120825 Ending_Date: 20150721 Currentness_Reference: ground condition at the time the samples were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -74.5811 East_Bounding_Coordinate: -73.7412 North_Bounding_Coordinate: 38.0977 South_Bounding_Coordinate: 36.8654 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:57a3c016e4b0d7d7d7af97c1 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: biota Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: Pleistocene Theme_Keyword: grab sampling Theme_Keyword: light stable isotope analysis Theme_Keyword: radiometric dating Theme_Keyword: carbon-14 analysis Theme_Keyword: specimen collecting Theme_Keyword: chemical analysis Theme_Keyword: uranium-thorium analysis Theme_Keyword: marine chemistry Theme_Keyword: paleoceanography Theme_Keyword: sedimentation Theme_Keyword: sea-level change Theme_Keyword: mollusks Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: geochemistry Theme_Keyword: chemical analysis Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Habitat Theme_Keyword: Physical/Chemical Features Theme_Keyword: Physical Habitats and Geomorphology Theme_Keyword: Natural Gas Resources Theme_Keyword: Ecological Functions and Services Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: chemosynthesis Theme_Keyword: cold seep Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Place: Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS) Place_Keyword: Atlantic Ocean Place_Keyword: Baltimore Canyon Place_Keyword: Norfolk Canyon Access_Constraints: None Use_Constraints: USGS-authored or produced data and information are in the public domain. Acknowledge the U.S. Geological Survey, National Oceanic and Atmospheric Administration (NOAA), and Bureau of Ocean Energy Management (BOEM) in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Data_Set_Credit: Diana Sahy, Carolyn Ruppel, Brendan Roark, Dan Condon, and Amanda Demopoulos Native_Data_Set_Environment: Mac OSX 10.9.5; Microsoft Excel 14.6.6 for Mac Cross_Reference: Citation_Information: Originator: Nancy G. Prouty Originator: Diana Sahy Originator: Carolyn D. Ruppel Originator: E. Brendan Roark Originator: Dan Condon Originator: Sandra Brook Originator: Steve W. Ross Originator: Amanda W.J. Demopoulos Publication_Date: 2016 Title: Insights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps Other_Citation_Details: Prouty, N.G., Sahy, D., Ruppel, C.D., Roark, E.B., Condon, D., Brook, S., Ross, S.W., and Demopoulos, A.W.J., 2016, Insights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps: Earth and Planetary Science Letters, v. 449, p. 332-344 Online_Linkage: https://doi.org/10.1016/j.epsl.2016.05.023 Cross_Reference: Citation_Information: Originator: Stuiver, M. Originator: Polach, H.A. Publication_Date: 1977 Title: Discussion reporting of 14C data Other_Citation_Details: Stuiver, M., and Polach, H.A., 1977, Discussion reporting of 14C data: Radiocarbon, v. 19, p. 355-363 Cross_Reference: Citation_Information: Originator: Fisher, C.R. Originator: Childress, J.J. Publication_Date: 1992 Title: Organic carbon transfer from methanotrophic symbionts to the host hydrocarbon-seep mussel Other_Citation_Details: Fisher, C.R., and Childress, J.J., 1992, Organic carbon transfer from methanotrophic symbionts to the host hydrocarbon-seep mussel: Symbiosis, v. 12, p. 221-235 Cross_Reference: Citation_Information: Originator: Jaffey, A.H. Originator: Flynn, K.F. Originator: Glendenin, L.E. Originator: Bentley, W.C. Originator: Essling, A.M. Publication_Date: 1971 Title: Precision measurement of half-lives and specific activities of 235U and 238U Other_Citation_Details: Jaffey, A.H., Flynn, K.F., Glendenin, L.E., Bentley, W.C., and Essling, A.M., 1971, Precision measurement of half-lives and specific activities of 235U and 238U: Physical Review C, v. 4, p. 1889-1905 Online_Linkage: http://journals.aps.org/prc/abstract/10.1103/PhysRevC.4.1889 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: All geochemistry data were calibrated against known standards. Logical_Consistency_Report: No formal logical accuracy tests were conducted. Completeness_Report: Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Isotope Lab, Menlo Park CA Publication_Date: 2014 Title: strontium isotope ratios Type_of_Source_Media: lab sample Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20140602 Source_Currentness_Reference: date when lab analysis was completed. Source_Citation_Abbreviation: 87Sr:86Sr Source_Contribution: The isotopic composition was measured on a Finnigan MAT 261 multi-collector mass spectrometer using a static-collection mode. Source_Information: Source_Citation: Citation_Information: Originator: NERC Isotope Geosciences Laboratory, British Geological Survey, http://www.bgs.ac.uk/sciencefacilities/igfs/home.html Publication_Date: 2016 Title: Uranium-Thorium dating Type_of_Source_Media: lab sample Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20160217 Source_Currentness_Reference: date when lab analysis was completed. Source_Citation_Abbreviation: U-Th dates Source_Contribution: Samples were processed via total dissolution techniques, with isotope ratios measured on a Thermo Neptune Plus multi-collector ICP-MS, relative to a mixed 229Th-236U tracer calibrated against gravimetric solutions of CRM 112a U and Ames laboratory high purity Th. Source_Information: Source_Citation: Citation_Information: Originator: Keck Carbon Cycle AMS laboratory at UC Irvine; http://www.ess.uci.edu/researchgrp/ams/home Publication_Date: 2014 Title: radiocarbon dating Type_of_Source_Media: lab sample Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20141119 Source_Currentness_Reference: date when lab analysis was completed. Source_Citation_Abbreviation: Delta-C-14 dates Source_Contribution: Radiocarbon (Delta-C-14) analysis was performed on subsamples of authigenic carbonates and mussel shells collected from dead and live mussel specimens. Source_Information: Source_Citation: Citation_Information: Originator: USGS Pacific Coastal and Marine Science Center Publication_Date: 2014 Title: mineralogy Type_of_Source_Media: lab sample Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20140902 Source_Currentness_Reference: date when lab analysis was completed. Source_Citation_Abbreviation: mineralogy composition Source_Contribution: Sample mineralogy was determined microscopically in thin sections, and by X-ray diffraction (XRD) using a Philips XRD with graphite monochromator at 40 kV and 45 mA. Source_Information: Source_Citation: Citation_Information: Originator: Stable Isotope Geoscience Facility at Texas A&M University, College Station; http://geosciences.tamu.edu/facilities/stable-isotope-geosciences-facility/sigf-about/index.php Publication_Date: 2014 Title: delta-C-13 and delta-O-18 Type_of_Source_Media: lab sample Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20140604 Source_Currentness_Reference: date when lab analysis was completed. Source_Citation_Abbreviation: stable carbon and oxygen isotope analyses Source_Contribution: Data were generated from a Thermo-Finnigan MAT 253 with a Kiel IV Automated Carbonate Prep Device. Process_Step: Process_Description: Results from labs listed above were combined into an Excel spreadsheet (MDAC_Geochemistry.xlsx) for this data release. Source_Used_Citation_Abbreviation: All source contributions were used for this data compilation. Process_Date: 20160629 Process_Step: Process_Description: Latitude and longitude positions, and accompanying depth information, were found to be incorrect in original data and have been corrected, resulting in version 2 of this data release. Metadata file was updated to include versioning information for these corrections. Process_Date: 20190326 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Nancy Prouty Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7526 Contact_Electronic_Mail_Address: nprouty@usgs.gov Process_Step: Process_Description: Metadata file was brought up to current PCMSC standards, including moving the information about the accompanying journal article from the Larger Works section to the Cross_Reference section, standardizing Cross_Reference citatons, and updating Point_of_Contact and Metadata_Contact information. No data were changed. Process_Date: 20190327 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan Cochran Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Process_Step: Process_Description: Edits were made to standardize a few of the "None" keywords. Process_Date: 20190620 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan A Cochran Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission St. City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: United States Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Process_Step: Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Process_Date: 20201019 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: Performed minor edits to the metadata to correct typos. No data were changed Process_Date: 20211013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Susan A. Cochran Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: point Point_and_Vector_Object_Count: 254 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0001 Longitude_Resolution: 0.0001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_198 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: MDAC_Geochemistry_v.2.0.xlsx Entity_Type_Definition: Table containing geochemical analyses of authigenic carbonates, sediment, water and mussels. Entity_Type_Definition_Source: producer defined Attribute: Attribute_Label: Sample ID Attribute_Definition: The unique sample identification of a particular sample Attribute_Definition_Source: producer defined Attribute_Domain_Values: Unrepresentable_Domain: The Sample ID contains the dive number and either a number or description of the sample in a collection series. Attribute: Attribute_Label: Sample Type Attribute_Definition: Explains the sample type or sample material matrix Attribute_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: authigenic carbonate-groundmass Enumerated_Domain_Value_Definition: matrix portion of the authigenic carbonate. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: authigenic carbonate-cement Enumerated_Domain_Value_Definition: precipitate portion of the authigenic carbonate. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: shell in authigenic carbonate Enumerated_Domain_Value_Definition: intact shell fragments embedded into the authigenic carbonate matrix. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sediment Enumerated_Domain_Value_Definition: geologic solid fragmented material, such as silt, sand, gravel. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mussel carbonate shell (collected alive) Enumerated_Domain_Value_Definition: carbonate material from mussel shells with living mussel. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mussel carbonate shell (collected dead) Enumerated_Domain_Value_Definition: carbonate material from mussel shells without living mussel. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mussel carbonate shell (unknown) Enumerated_Domain_Value_Definition: carbonate material from mussel shells but not known whether collected from living mussel. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mussel periostracum Enumerated_Domain_Value_Definition: thin, organic-rich outer layer of mussel shell. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: seawater Enumerated_Domain_Value_Definition: filtered seawater collected from Niskin bottle. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mussel gill Enumerated_Domain_Value_Definition: gill tissue from mussel specimen Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: carbonate mussel shell (collected dead) 10% HCl Enumerated_Domain_Value_Definition: carbonate material from mussel shells without living mussel and pretreated with 10% hydrochloric acid. Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: detritus Enumerated_Domain_Value_Definition: sediment analyzed to quantify the non-authigenic U and Th. Enumerated_Domain_Value_Definition_Source: producer defined Attribute: Attribute_Label: Location Attribute_Definition: Lists whether the sample was collected from either Baltimore Canyon or Norfolk Canyon Attribute_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Baltimore Canyon Enumerated_Domain_Value_Definition: Name of canyon where sample was collected Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Norfolk Canyon Enumerated_Domain_Value_Definition: Name of canyon where sample was collected Enumerated_Domain_Value_Definition_Source: producer defined Attribute: Attribute_Label: Station Number Attribute_Definition: Station number listed as vessel-year-number. Vessel abbreviations are as follows: RB=R/V Ron Brown; NF=R/V Nancy Foster; AT=R/V Atlantis. Year is designated with two digits (for example 03=2003; 14=2014). Number is a sequential number assigned by the vessel. Gaps in sequential numbers are common, as not all stations had samples collected or analyzed. Vessel designation AT, from the R/V Atlantis also includes the AT cruise number 29. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Unrepresentable_Domain: Station number listed as vessel-year-station number. Attribute: Attribute_Label: Depth (m) Attribute_Definition: Identifies either the depth range in meters or the exact depth in meters. Range is given as a function of the remotely operated underwater vehicle (ROV) dive range when it was uncertain within the dive when a specific specimen was collected and placed in the ROV sled. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 364 Range_Domain_Maximum: 1617 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Date of Collection Attribute_Definition: Calendar date (month/day/year) when sample was collected in the field Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 8/25/12 Range_Domain_Maximum: 7/21/15 Attribute_Units_of_Measure: month/day/year Attribute: Attribute_Label: Latitude Attribute_Definition: Latitude Attribute_Definition_Source: based on ship and ROV navigation systems Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 36.8654 Range_Domain_Maximum: 38.0977 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: Longitude Attribute_Definition: Longitude Attribute_Definition_Source: based on ship and ROV navigation systems Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -74.5811 Range_Domain_Maximum: -73.7412 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: Calcium Carbonate Attribute_Definition: percent calcium carbonate Attribute_Definition_Source: Mineral percentages were determined by multiplying unique peak intensities for each mineral in a sample by relative intensity factors. Empty cells in the spreadsheet are common, as calcium carbonate was not calculated for every sample. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.30 Range_Domain_Maximum: 97.20 Attribute_Units_of_Measure: percent Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: delta-C-13 Attribute_Definition: delta-C-13 is a measure of the ratio of stable isotopes Carbon-13:Carbon-12, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 13C:12C was not calculated for every sample. Attribute_Definition_Source: standard reporting value in isotope chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.66 Range_Domain_Maximum: 0.90 Attribute_Units_of_Measure: parts per thousand (per mil) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: delta-O-18 Attribute_Definition: delta-O-18 is a measure of the ratio of stable isotopes Oxygen-18:Oxygen-16, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 18O:16O was not calculated for every sample. Attribute_Definition_Source: standard reporting value in isotope chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.34 Range_Domain_Maximum: 5.13 Attribute_Units_of_Measure: parts per thousand (per mil) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 87Sr:86Sr Attribute_Definition: a measure of the ratio of isotopes Strontium-87:Strontium-86. Empty cells in the spreadsheet are common, as 87Sr:86Sr was not calculated for every sample. Attribute_Definition_Source: standard reporting value in isotope chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.70915 Range_Domain_Maximum: 0.70924 Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: delta-S-34 Attribute_Definition: a measure of the ratio of stable isotopes Sulfur-34:Sulfur-32, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 34S:32S was not calculated for every sample. Attribute_Definition_Source: standard reporting value in isotope chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.07 Range_Domain_Maximum: 22.65 Attribute_Units_of_Measure: parts per thousand (per mil) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Delta-C-14 Attribute_Definition: The relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and delta-Carbon-13. Empty cells in the spreadsheet are common, as Delta-Carbon-14 was not calculated for every sample. Attribute_Definition_Source: defined in Stuiver and Polach (1977) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -959 Range_Domain_Maximum: -24 Attribute_Units_of_Measure: parts per thousand (per mil) Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Uranium Attribute_Definition: concentration of Uranium in sample in parts per million (ppm). Empty cells in the spreadsheet are common, as Uranium concentration was not calculated for every sample. Attribute_Definition_Source: standard value in analytical chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.1181 Range_Domain_Maximum: 4.5917 Attribute_Units_of_Measure: parts per million (ppm) Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 232Th Attribute_Definition: Definition: concentration of Thorium-232 in sample in parts per million (ppm). Empty cells in the spreadsheet are common, as concentration of 232Th was not calculated for every sample. Attribute_Definition_Source: standard value in isotope chemistry Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0650 Range_Domain_Maximum: 18.0806 Attribute_Units_of_Measure: parts per billion (ppb) Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 230Th:232Th AR Attribute_Definition: Thorium-230:Thorium-232 Activity Ratio. Activity ratios corrected for hydride formation, tailing, fractionation, SEM-Faraday yield, and tracer isotopic composition. Empty cells in the spreadsheet are common, as 230Th:232Th AR was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.6802 Range_Domain_Maximum: 8.5854 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 232Th:238U AR Attribute_Definition: Thorium-232:Uranium-238 Activity Ratio. Activity ratios corrected for hydride formation, tailing, fractionation, SEM-Faraday yield, and tracer isotopic composition. Empty cells in the spreadsheet are common, as 232Th:238U AR was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0062 Range_Domain_Maximum: 2.1560 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 232Th:238U AR (error) Attribute_Definition: Thorium-232:Uranium-238 Activity Ratio error reported as 2 sigma composition. Empty cells in the spreadsheet are common, as 232Th:238U AR (error) was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0487 Range_Domain_Maximum: 0.5451 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 230Th:238U AR Attribute_Definition: Thorium-230:Uranium-238 Activity Ratio. Activity ratios corrected for hydride formation, tailing, fractionation, SEM-Faraday yield, and tracer isotopic composition. Empty cells in the spreadsheet are common, as 230Th:238U AR was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0240 Range_Domain_Maximum: 2.0674 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 230Th:238U AR (error) Attribute_Definition: Thorium-230:Uranium-238 Activity Ratio error reported as 2 sigma composition. Empty cells in the spreadsheet are common, as 230Th:238U AR (error) was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.24483 Range_Domain_Maximum: 1.00785 Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: 234U:238U AR Attribute_Definition: Uranium-234:Uranium-238 Activity Ratio. Activity ratios corrected for hydride formation, tailing, fractionation, SEM-Faraday yield, and tracer isotopic composition. Empty cells in the spreadsheet are common, as 234U:238U AR was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.9887 Range_Domain_Maximum: 1.1447 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 234U:238U AR (error) Attribute_Definition: Uranium-234:Uranium-238 Activity Ratio error reported as 2 sigma composition. Empty cells in the spreadsheet are common, as 234U:238U AR (error) was not calculated for every sample. Attribute_Definition_Source: defined in Jaffey and others, 1971 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.1051 Range_Domain_Maximum: 0.1543 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 230Th:238U AR corrected Attribute_Definition: Corrected using average measured detrital Uranium and Thorium isotopic compositions for the Norfolk Canyon [(232Th:238U) = 1.38, (230Th:238U) = 2.05 and (234U:238U) = 0.99, n=3)] and Baltimore Canyon [(232Th:238U) = 1.39, (230Th:238U) = 1.32 and (234U:238U) = 1.00, n=3)] sites with all uncertainties set at +/- 25 percent. Empty cells in the spreadsheet are common, as 230Th:238U AR corrected was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0122 Range_Domain_Maximum: 0.1572 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 230Th:238U AR corrected (error) Attribute_Definition: Corrected using average measured detrital Uranium and Thorium isotopic error reported as 2-sigma composition. Empty cells in the spreadsheet are common, as 230Th:238U AR corrected (error) was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.7780 Range_Domain_Maximum: 6.8709 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 234U:238U AR corrected Attribute_Definition: Corrected using average measured detrital Uranium and Thorium isotopic compositions for the Norfolk Canyon [(232Th:238U) = 1.38, (230Th:238U) = 2.05 and (234U:238U) = 0.99, n=3)] and Baltimore Canyon [(232Th:238U) = 1.39, (230Th:238U) = 1.32 and (234U:238U) = 1.00, n=3)] sites with all uncertainties set at +/- 25 percent. Empty cells in the spreadsheet are common, as 234U:238U AR corrected was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.1407 Range_Domain_Maximum: 1.1461 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: 234U:238U AR corrected (error) Attribute_Definition: Corrected using average measured detrital Uranium and Thorium isotopic error reported as 2-sigma composition. Empty cells in the spreadsheet are common, as 234U:238U AR corrected (error) was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.1137 Range_Domain_Maximum: 0.1780 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: Rho 08-48 Attribute_Definition: Rho 08-48 is the correlation coefficient between the 230Th:238U and 234U:238U activity ratios. Empty cells in the spreadsheet are common, as Rho 08-48 was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.6879 Range_Domain_Maximum: -0.0044 Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: Age (ka) Attribute_Definition: Uranium-Thorium derived age in thousands of years. Empty cells in the spreadsheet are common, as Age (ka) was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.17 Range_Domain_Maximum: 16.09 Attribute_Units_of_Measure: thousands of years Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Age error (ka) Attribute_Definition: Uranium-Thorium derived age error. Empty cells in the spreadsheet are common, as Age error (ka) was not calculated for every sample. Attribute_Definition_Source: produced defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.03 Range_Domain_Maximum: 1.21 Attribute_Units_of_Measure: thousands of years Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: Entity and attribute information provided here describes the tabular data in the data release spreadsheet, MDAC_Geochemistry.xlsx. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey, Nancy G. Prouty Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: Mailing and Physical Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: These data are available in Excel format contained in a single file. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Microsoft Excel format Format_Version_Number: 14.6.2 Transfer_Size: 0.044 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/57a3c016e4b0d7d7d7af97c1 Network_Resource_Name: https://doi.org/10.5066/F77942SJ Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of data and metadata. The second link points to a landing page with metadata and data. Previous versions of the data can be obtained by contacting nprouty@usgs.gov. Fees: None. Metadata_Reference_Information: Metadata_Date: 20211013 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998