Results from isotope analysis of authigenic carbonates collected offshore the U.S. Mid- and South Atlantic

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Frequently anticipated questions:

What does this data set describe?

Title:
Results from isotope analysis of authigenic carbonates collected offshore the U.S. Mid- and South Atlantic
Abstract:
Geochemical analysis of carbonate rock samples collected from seep fields on the RB1903 and AT41 research expeditions in the U.S. Mid- and South Atlantic. Samples were collected as a fingerprint to past hydrocarbon seep activity, fluid source, and depositional environment.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-314-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-003-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2018-042-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., and Chaytor, Jason, 20220811, Results from isotope analysis of authigenic carbonates collected offshore the U.S. Mid- and South Atlantic: data release DOI:10.5066/P9DRU8TP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Chaytor, Jason, and Prouty, Nancy G., 2021, Carbonate chemistry measurements of authigenic carbonates collected offshore the U.S. Mid- and South Atlantic in 2018 and 2019 as part of the DEEPSEARCH Project.: data release DOI:10.5066/P9DRU8TP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -76.1907
    East_Bounding_Coordinate: -74.7924
    North_Bounding_Coordinate: 35.9274
    South_Bounding_Coordinate: 32.4938
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 21-Aug-2018
    Ending_Date: 27-Apr-2019
    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 (46)
    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 of geochemical analysis of authigenic carbonate samples. (Source: Producer defined.)
    Cruise
    Name of cruise on which samples were collected. The name of the cruise may contain a ship abbreviation and year (Ron Brown=RB1903 and [20XX year, month], AT41=R/V Atlantis and sequential cruise number). (Source: Producer defined) List of cruise names
    Ship
    Name of ship on which samples were collected (Source: Producer defined.) List of cruise names
    Site Name
    Site Name where samples were collected (Source: Producer defined.) List of Site names
    Date
    Date [YYYY-MM-DD] (Source: Producer defined.)
    Range of values
    Minimum:2018-08-21
    Maximum:2019-04-27
    Sample ID
    Unique cruise sample ID based on cruise ID (e.g., RB1903, AT41), submersible (J2=JASON II, AL=Alvin), dive number (e.g., 1133; 4967), sample storage location (e.g., B5=biobox 5, RB=rear biobox), and sample number (e.g., R1 with R=rock). (Source: Producer defined.) List of sample IDs
    Depth
    meters above seafloor (Source: Producer defined.)
    Range of values
    Minimum:235
    Maximum:2169
    Units:meters
    Resolution:1
    Latitude
    Latitude of sample location (Source: Producer defined.)
    Range of values
    Minimum:32.4938
    Maximum:35.9274
    Units:decimal degrees
    Resolution:0.0001
    Longitude
    Longitude of sample location (Source: Producer defined.)
    Range of values
    Minimum:-76.1907
    Maximum:-74.7924
    Units:decimal degrees
    Resolution:0.0001
    Total carbon
    Total carbon measured in carbonate sample (Source: Producer defined.)
    Range of values
    Minimum:5.887
    Maximum:10.830
    Units:percent
    Resolution:0.001
    Total organic carbon
    Total organic carbon measured in carbonate sample (Source: Producer defined.)
    Range of values
    Minimum:0.069
    Maximum:0.752
    Units:percent
    Resolution:0.001
    Total inorganic carbon
    Total inorganic carbon measured in carbonate sample (Source: Producer defined.)
    Range of values
    Minimum:5.336
    Maximum:10.583
    Units:percent
    Resolution:0.001
    Calcium carbonate
    Total calcium carbonate measured in carbonate sample (Source: Producer defined.)
    Range of values
    Minimum:44.463
    Maximum:88.184
    Units:percent
    Resolution:0.001
    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). (Source: standard reporting values in isotope chemistry)
    Range of values
    Minimum:-47.65
    Maximum:-38.07
    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). (Source: standard reporting values in isotope chemistry)
    Range of values
    Minimum:2.87
    Maximum:4.24
    Units:parts per thousand (per mil)
    Resolution:0.01
    Delta-47
    Clumped isotope measurement following methods from Swart and others (2019) by examining the clumping of C-13 and O-18 isotopes within a single carbonate phase (Source: Producer defined.)
    Range of values
    Minimum:0.630
    Maximum:0.661
    Units:per mil
    Resolution:0.001
    Delta-47 standard deviation
    Standard deviation of Delta-47 measurements based on replicate measurements (Source: Producer defined.)
    Range of values
    Minimum:0.001
    Maximum:0.210
    Units:per mil
    Resolution:0.001
    Temperature
    Delta-47 derived temperature for the reaction at 90°C following the calibration equation from Swart and others (2019) (Source: Swart and others (2019))
    Range of values
    Minimum:5.90
    Maximum:15.10
    Units:degrees Celsius
    Resolution:0.01
    Temperature error
    Error associated with temperature calculations based on replicated of Delta-47 measurements (Source: Swart and others (2019))
    Range of values
    Minimum:0.40
    Maximum:8.00
    Units:degrees Celsius
    Resolution:0.01
    Entity_and_Attribute_Overview: The first line of the tab-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
    • Jason Chaytor
  2. Who also contributed to the data set?
    Peter Swart (university of Miami), Angela Tan (USGS PCMSC), Colin Carney (University of California, Santa Cruz)
  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 as part of the Deep Sea Exploration to Advance Research on Coral/Canyon/Cold seep Habitats (DEEP SEARCH) study, a multiyear, multi-agency campaign to characterize the deep-sea ecosystems to better understand the distribution of sensitive seafloor communities to inform potential offshore energy development and other deep-sea management.

How was the data set created?

  1. From what previous works were the data drawn?
    clumped isotopes (source 1 of 4)
    University of Miami, Rosenstiel School of Marine and Atmospheric Sciences (RSMAS), Stable Isotope Geochemistry Isotope Laboratory, 2021, Clumped isotope analysis.

    Online Links:

    Type_of_Source_Media: carbonate lab samples
    Source_Contribution:
    Stable carbon and oxygen isotopes were measured using Thermoscientific 253 isotope ratio mass spectrometer.
    Total carbon (TC), Total inorganic carbon (TIC), and Total organic carbon (source 2 of 4)
    USGS Pacific Coastal and Marine Science Center sediment laboratory, 2020, Carbon analysis.

    Type_of_Source_Media: carbonate lab samples
    Source_Contribution:
    Total carbon (TC), total inorganic carbon (TIC), and total organic carbon contents of bulk sediment were determined coulometrically (CM 5015 coulometer; UIC, Inc.) at the USGS Pacific Coastal and Marine Science Center sediment lab.
    dissolved inorganic carbon (source 3 of 4)
    University of California, Santa Cruz (UCSC) Stable Isotope Laboratory, 2019, stable isotope analysis.

    Online Links:

    Type_of_Source_Media: carbonate lab samples
    Source_Contribution:
    Carbonate samples were analyzed for carbon and oxygen stable isotopes using a Thermo-Finnigan MAT 253 with a Kiel IV Automated Carbonate Prep Device
    dissolved inorganic carbon (source 4 of 4)
    Stanford University Stable Isotope and Carbon System Laboratory, 2020, stable isotope analysis.

    Online Links:

    Type_of_Source_Media: carbonate lab samples
    Source_Contribution:
    Carbonate samples were analyzed for carbon and oxygen stable isotopes using a Thermo-Finnigan MAT 252 with a Kiel III Automated Carbonate Prep Device
  2. How were the data generated, processed, and modified?
    Date: 2020 (process 1 of 2)
    Authigenic carbonate samples were collected during HOV and ROV dives. Samples were rinsed with freshwater, allowed to dry, photographed and stored at room temperature.
    Date: 2020 (process 2 of 2)
    Authigenic carbonate samples were cut using a diamond band saw to expose fresh surfaces. Subsamples, including discretely drilled powders for isotope and carbon analysis, in order to isolate cement from different precipitation events. Results from the different labs were combined into one spreadsheet. Empty cells are designated by -9999 indicating no analysis was performed. Data sources used in this process:
    • Stanford
    • UCSC
    • RSMAS
  3. What similar or related data should the user be aware of?
    Swart, Peter K., Murray, Sean T., Staudigel, Phillip T., and Hodell, David D., 2019, Oxygen isotopic exchange between CO2 and phosphoric acid: Implications for the measurement of clumped isotopes in carbonates.

    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. Both the research vessel and remotely occupied vehicle are equipped with navigational systems and conduct checks to assess the accuracy of the horizontal positioning.
  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. Both the research vessel and remotely occupied vehicle are equipped with navigational systems and conduct checks to assess the accuracy of the vertical positioning.
  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. 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.
  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, Bureau of Ocean Energy Management (BOEM), and the National Oceanic and Atmospheric Administration (NOAA) 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 text file (DEEPSEARCH_Carbonates_Isotopes.csv) which contains seawater carbonate analysis and CTD data for all collected water samples.
  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: 11-Aug-2022
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_P9DRU8TP/DEEPSEARCH_Carbonates_Isotopes_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Sep 15 15:49:28 2022