Geochemical analysis of seeps along the Queen Charlotte Fault

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Frequently anticipated questions:

What does this data set describe?

Title: Geochemical analysis of seeps along the Queen Charlotte Fault
Abstract:
Geochemical analyses of authigenic carbonates, bivalves, and pore fluids were performed on samples collected from seep fields along the Queen Charlotte Fault, a right lateral transform boundary that separates the Pacific and North American tectonic plates. Samples were collected using grab samplers and piston cores, and were collected during three different research cruises in 2011, 2015, and 2017.
Supplemental_Information:
Samples from 2011 and 2015 were collected by Dr. Vaughn Barrie from Pacific Geoscience Centre of the Geological Survey of Canada during their research cruises (2011002PGC and 2015004PGC).
Additional information about the USGS field activity from which the 2017 samples were collected is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-652-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Prouty, Nancy G., Lorenson, Thomas D., and Law, Michael D., 2019, Geochemical analysis of seeps along the Queen Charlotte Fault: data release DOI:10.5066/P9RK94EE, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -136.3077
    East_Bounding_Coordinate: -131.4506
    North_Bounding_Coordinate: 57.2007
    South_Bounding_Coordinate: 52.0185
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5c4f4a04e4b0708288f78e07?name=2017-STN40.jpg&allowOpen=true (JPEG)
    In-situ photograph of authigenic carbonate (sample 2017-STN40).
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 07-Jul-2011
    Ending_Date: 28-Sep-2017
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (72)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    QCF_Geochemistry.csv
    Table containing geochemical analyses of authigenic carbonates, pore fluid, and bivalves. (Source: Producer defined.)
    Sample ID
    The unique sample identification of a particular sample (Source: producer defined) The unique Sample ID contains the station number and either a number or description of the sample in a collection series.
    Sample Type
    Explains the sample type or sample material matrix (Source: producer defined)
    ValueDefinition
    authigenic carbonatecement and groundmass of authigenic carbonate
    shell in authigenic carbonateintact shell fragments embedded into the authigenic carbonate matrix
    pore fluidfiltered pore fluid collected from piston cores
    mussel gillgill tissue from mussel specimen
    Station Number
    Station number listed as year-station number. (Source: producer defined) Station number listed as year-station number.
    Depth
    Identifies either the depth range in meters or the exact depth in meters. (Source: producer defined)
    Range of values
    Minimum:492
    Maximum:1003
    Units:meters
    Resolution:1
    Date of Collection
    Calendar date (month/day/year) when sample was collected in the field (Source: producer defined)
    Range of values
    Minimum:7/7/2011
    Maximum:9/28/2017
    Units:month/day/year
    Latitude
    Latitude (Source: based on ship navigation system)
    Range of values
    Minimum:52.0185
    Maximum:57.2007
    Units:decimal degrees
    Resolution:0.0001
    Longitude
    Longitude (Source: based on ship navigation system)
    Range of values
    Minimum:-136.3007
    Maximum:-131.4506
    Units:decimal degrees
    Resolution:0.0001
    Calcium Carbonate
    percent calcium carbonate (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.)
    Range of values
    Minimum:6.92
    Maximum:97.06
    Units:percent
    Resolution:0.01
    delta-C-13
    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. (Source: standard reporting value in isotope chemistry)
    Range of values
    Minimum:-48.82
    Maximum:-2.96
    Units:parts per thousand (per mil)
    Resolution:0.01
    delta-O-18
    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. (Source: standard reporting value in isotope chemistry)
    Range of values
    Minimum:-6.89
    Maximum:6.44
    Units:parts per thousand (per mil)
    Resolution:0.01
    87Sr:86Sr
    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. (Source: standard reporting value in isotope chemistry)
    Range of values
    Minimum:0.70892
    Maximum:0.70916
    Resolution:0.00001
    delta-S-34
    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. (Source: standard reporting value in isotope chemistry)
    Range of values
    Minimum:-10.43
    Maximum:0.84
    Units:parts per thousand (per mil)
    Resolution:0.01
    Uranium
    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. (Source: standard value in analytical chemistry)
    Range of values
    Minimum:1.9920
    Maximum:5.6164
    Units:parts per million (ppm)
    Resolution:0.0001
    232Th
    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. (Source: standard value in isotope chemistry)
    Range of values
    Minimum:0.0901
    Maximum:0.9030
    Units:parts per billion (ppb)
    Resolution:0.0001
    230Th:232Th AR
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:2.6363
    Maximum:6.1814
    Resolution:0.0001
    232Th:238U AR
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:0.0149
    Maximum:0.0712
    Resolution:0.0001
    232Th:238U AR (error)
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:0.06
    Maximum:0.21
    Resolution:0.01
    230Th:238U AR
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:0.0529
    Maximum:0.2571
    Resolution:0.0001
    230Th:238U AR (error)
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:0.53
    Maximum:0.86
    Resolution:0.01
    234U:238U AR
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:1.1268
    Maximum:1.1383
    Resolution:0.0001
    234U:238U AR (error)
    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. (Source: defined in Jaffey and others, 1971)
    Range of values
    Minimum:0.21
    Maximum:0.43
    Resolution:0.01
    230Th:238U AR corrected
    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. (Source: produced defined)
    Range of values
    Minimum:0.0360
    Maximum:0.1906
    Resolution:0.0001
    230Th:238U AR corrected (error)
    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. (Source: produced defined)
    Range of values
    Minimum:13.76
    Maximum:42.04
    Resolution:0.01
    234U:238U AR corrected
    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. (Source: produced defined)
    Range of values
    Minimum:1.1337
    Maximum:1.1398
    Resolution:0.0001
    234U:238U AR corrected (error)
    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. (Source: produced defined)
    Range of values
    Minimum:0.56
    Maximum:2.31
    Resolution:0.01
    Rho 08-48
    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. (Source: produced defined)
    Range of values
    Minimum:0.228
    Maximum:0.326
    Resolution:0.001
    Age (ka)
    Uranium-Thorium derived age in thousands of years. Empty cells in the spreadsheet are common, as Age (ka) was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:3.50
    Maximum:20.00
    Units:thousands of years
    Resolution:0.01
    Age error (ka)
    Uranium-Thorium derived age error. Empty cells in the spreadsheet are common, as Age error (ka) was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:1.02
    Maximum:5.96
    Units:thousands of years
    Resolution:0.01
    delta-N-15
    delta-N-15 is a measure of the ratio of stable isotopes Nitrogen-15:Nitrogen-14, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 15N:14N was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:3.04
    Maximum:4.60
    Units:thousands of years
    Resolution:0.01
    chloride
    Chloride concentration measured in pore fluid samples. Empty cells in the spreadsheet are common, as chloride was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:541.06
    Maximum:565.65
    Units:micromolar
    Resolution:0.01
    sulfate
    Sulfate concentration measured in pore fluid samples. Empty cells in the spreadsheet are common, as sulfate was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:0.57
    Maximum:28.03
    Units:micromolar
    Resolution:0.01
    hydrogen isotope
    Deuterium is a stable isotope of hydrogen. Empty cells in the spreadsheet are common, as deuterium was not calculated for every sample. (Source: produced defined)
    Range of values
    Minimum:-10.51
    Maximum:6.97
    Units:parts per thousand (per mil)
    Resolution:0.01
    Core depth
    Depth below top of piston core for pore fluid sampling. Empty cells in the spreadsheet are common, as pore fluid samples were not every sample. (Source: produced defined)
    Range of values
    Minimum:3
    Maximum:187
    Units:centimeter
    Resolution:1
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Nancy G. Prouty
    • Thomas D. Lorenson
    • Michael D. Law
  2. Who also contributed to the data set?
    Jamie Conrad, Danny Brothers, Miranda Baker, Rachel Lauer, Michael Lauer, Mary McGann
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These samples were collected and analyzed as part of an effort to determine the origin and occurrence of venting along the Queen Charlotte Fault.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 01-Dec-2018 (process 1 of 4)
    Results from the all lab analyses were combined into a comma-delimited text document (QCF_Geochemistry.csv) for this data release.
    Date: 09-Sep-2019 (process 2 of 4)
    Corrected typos in DOI# and several links. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    United States

    831-460-7545 (voice)
    scochran@usgs.gov
    Date: 19-Oct-2020 (process 3 of 4)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 13-Oct-2021 (process 4 of 4)
    Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?
    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..

    Online Links:

    Other_Citation_Details: Physical Review C 4.
    Brothers, Daniel S., Andrews, Brian D., Walton, Maureen A.L., Greene, H. Gary, Barrie, J. Vaughn, Miller, Nathan C., Brink, Uri ten, East, Amy E., Haeussler, Peter J., Kluesner, Jared W., and Conrad, James E., 2018, Slope failure and mass transport processes along the Queen Charlotte Fault, southeastern Alaska: The Geological Society of London, London.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    All geochemistry data were calibrated against known standards.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy is estimated at less than 1 m.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Depth was determined by 18 kHz Konsberg EK60 echosounder with an estimated accuracy of 1 m.
  4. Where are the gaps in the data? What is missing?
    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
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and Geological Survey of Canada and the University of Calgary.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in .csv format contained in a single file.
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with Microsoft Excel or any text reader

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9RK94EE/QCF_Geochemistry_metadata.faq.html>
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