Geochemistry of authigenic carbonates from Cascadia Margin

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What does this data set describe?

Title: Geochemistry of authigenic carbonates from Cascadia Margin
Abstract:
Geochemical analysis of authigenic carbonates from the Cascadia Subduction Zone. Powdered carbonate samples for stable carbon (delta-C-13) and oxygen (delta-O-18) isotopes and carbonate phase were analyzed as a proxy for potential fluid sources, and to better understand how process, such as mixing, and oxidation, can alter the initial fluid isotopic composition and the archived fluid-source signature in the authigenic carbonates.
Supplemental_Information:
Authigenic carbonate samples were collected by remotely operated vehicles (ROV) during several cruises with USGS participation (USGS field activities 2019-619-FA and 2019-672-FA) as well as samples donated from the National Oceanic and Atmospheric Administration (NOAA) during the RB-01-05-2, NA095 and NA128 cruises (USGS field activities 2020-649-DD, 2020-650-DD, and 2022-605-DD, respectively).
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-619-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-649-DD https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-650-DD https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-672-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-605-DD
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., 20230804, Geochemistry of authigenic carbonates from Cascadia Margin: data release DOI: 10.5066/P9J10NH5, 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: -125.4929
    East_Bounding_Coordinate: -124.6006
    North_Bounding_Coordinate: 46.9608
    South_Bounding_Coordinate: 40.8877
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/63fbe05cd34e4f7eda4664db?name=Cascadia_MDAC_geochemistry_map.jpg&allowOpen=true (JPEG)
    Map of Cascadia Margin showing sample locations of authigenic carbonate rock samples.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 07-Aug-2001
    Ending_Date: 03-Aug-2021
    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 (282)
    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 D_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?
    A comma-delimited text file with the first line being a header line.
    Output geochemical analysis of authigenic carbonates. (Source: Producer defined.)
    FAN
    USGS field activity number (Source: Producer defined.) USGS field activity number assigned by Coastal and Marine Hazards and Resources Data Catalog
    Vessel
    Name of vessel during collection of specimen (Source: Producer defined.) Name of vessel
    Cruise_ID
    Cruise identification (Source: Producer defined.) The Cruise ID contains the ship abbreviation (FK=Falkor, NA=Nautilus, RB=Ron Brown, RL=Reuben Lasker) and either a sequential number (for example, 095) or description of the date of cruise (for example, 190612 [year month start day]).
    Sample_ID
    Sample identification (Source: Producer defined.) The sample ID contains information about the ship (FK=Falkor, NA=Nautilus, R=Ron Brown, RL=Reuben Lasker), dive number (for example, S0206), and a number oof the sample in a collection series.
    Latitude
    Latitude of collection site of the authigenic carbonate sample for geochemical analysis. (Source: ship GPS)
    Range of values
    Minimum:40.8877
    Maximum:46.9608
    Units:decimal degrees
    Resolution:0.0001
    Longitude
    Longitude of collection site of the authigenic carbonate sample for geochemical analysis. (Source: ship GPS)
    Range of values
    Minimum:-125.4929
    Maximum:-124.6006
    Units:decimal degrees
    Resolution:0.0001
    Water_Depth
    Water depth below surface at collection site of the authigenic carbonate sample for geochemical analysis. (Source: produced defined)
    Range of values
    Minimum:102
    Maximum:1599
    Units:meters (m)
    Resolution:1
    Date_of_Collection
    Calendar date (month/day/year) when sample was collected in the field (Source: producer defined)
    Range of values
    Minimum:08/07/2001
    Maximum:08/03/2021
    Units:month/day/year
    Location
    Geographic location of collection site for authigenic carbonate (Source: Producer defined.) The location name is based on regional designation.
    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 Vienna Pee Dee Belemnite). (Source: standard reporting value in isotope chemistry)
    Range of values
    Minimum:-56.73
    Maximum:10.03
    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-13:Oxygen-16, reported in parts per thousand (per mil Vienna Pee Dee Belemnite). (Source: producer defined)
    Range of values
    Minimum:-1.85
    Maximum:9.15
    Units:parts per thousand (per mil)
    Resolution:0.01
    Bulk_carbonate_phase
    major (greater than 25 percent) carbonate phase. -9999 indicates no analysis was performed. -8888 indicates there was no major bulk component in a sample (no component in a sample was greater than 25 percent). (Source: Producer defined) Major phase (aragonite, Magnesium (Mg)-calcite, calcite, dolomite)
    Entity_and_Attribute_Overview:
    The first line of the comma-delimited text 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
  2. Who also contributed to the data set?
    N. Prouty and A. Gartman (USGS), C. Carney, S. Pitt, and S. Stemmler (University of Santa Cruz, UCSC), S. Merele and T. Baumberger (NOAA)
  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 Cascadia Subduction Zone, including determining linkages between seeps and submarine tectonic geomorphology.

How was the data set created?

  1. From what previous works were the data drawn?
    UCSC (source 1 of 2)
    University of California, Santa Cruz, 2022, stable carbon and oxygen isotope analysis.

    Online Links:

    Type_of_Source_Media: Authigenic carbonate lab samples
    Source_Contribution:
    Isotopic composition was determined via ThemoScientific Kiel IV carbonate device interfaced to ThermoScientific MAT-253 dual-inlet isotope ratio mass spectrometer (IRMS) at the University of California, Santa Cruz Stable Isotope Laboratory. Stable isotope values are reported in parts per thousand relative to the international reference Pee Dee Belemnite (PDB). Analytical uncertainties (1 sigma) are 0.05 per mil for delta-13-C and 0.10 per mil for delta-18-O.
    PCMSC (source 2 of 2)
    USGS Pacific Coastal and Marine Science Center, 2023, carbonate phase.

    Online Links:

    Type_of_Source_Media: Authigenic carbonate lab samples
    Source_Contribution:
    Mineralogy was determined by X-ray diffraction (XRD) using a Philips XRD with graphite monochromator at 40 kV and 45 mA. Step scans were run from 5 degrees to 65 degrees 2-theta with 0.02 degrees steps, using CuK-alpha radiation and a count time of 2 seconds per step. XRD digital scan data were analyzed using the Philips X'Pert High Score search-and-match function to identify minerals.
  2. How were the data generated, processed, and modified?
    Date: 2023 (process 1 of 1)
    Subsamples, including discretely drilled powders for carbon and oxygen isotope analysis, and XRD analysis were analyzed by two laboratories, and the results were combined into one spreadsheet. -9999 indicates no analysis was performed. -8888 indicates there was no major bulk carbonate component in a sample (no component in a sample was greater than 25 percent). Data sources used in this process:
    • UCSC
    • PCMSC
  3. What similar or related data should the user be aware of?
    Torres, Marta E., Embley, Robert W., Trehu, Anne M., Dietze, Heiner, Collier, Robert W., Suess, Erwin, and Heeschen, Katja U., 2009, Methane sources feeding cold seeps on the shelf and upper continental slope off central Oregon, USA.

    Online Links:

    Other_Citation_Details:
    Torres, M. E., Embley, R. W., Merle, S. G., Trehu, A. M., Collier, R. W., Suess, E., and Heeschen, K. U., 2009, Methane sources feeding cold seeps on the shelf and upper continental slope off central Oregon, USA: Geochemistry, Geophysics, Geosystems, v. 10, Q11003, doi:10.1029/2009GC002518.

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 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 metadata for each part of this data release carefully for additional details. If two elements are listed, each mineral in a bin individually meets the criteria of the bin. -9999 indicates no analysis was performed. -8888 indicates there was no major bulk carbonate component in a sample (no component in a sample was greater than 25 percent).
  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 as the originators of the dataset and in products derived from these data.
  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 a comma-delimited file (Cascadia_MDAC_geochemistry.csv) which contains the geochemistry results from authigenic carbonates collected along the Cascadia Subduction Zone.
  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 any text editor software.

Who wrote the metadata?

Dates:
Last modified: 04-Aug-2023
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_P9J10NH5/Cascadia_MDAC_geochemistry_metadata.faq.html>
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