Multi-Sensor Core Logger (MSCL) gamma-ray density and magnetic susceptibility of gravity cores and push cores from the Escanaba Trough (Gorda Ridge)

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Frequently anticipated questions:

What does this data set describe?

Title:
Multi-Sensor Core Logger (MSCL) gamma-ray density and magnetic susceptibility of gravity cores and push cores from the Escanaba Trough (Gorda Ridge)
Abstract:
This portion of the data release presents Multi-Sensor Core Logger (MSCL) gamma-ray density and magnetic susceptibility of push cores and gravity core sections collected from the Escanaba Trough vent field, Gorda Ridge, in the northeast Pacific Ocean. These data were collected in 2022 (USGS Field Activity 2022-621-FA). Data were collected from 18 gravity core sections and 34 push cores at 1 cm resolution. Data are provided in comma-delimited files (.csv).
Supplemental_Information:
Additional information about the field activity or activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-621-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?
    Adamczyk, Katlin Bowman, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 20250317, Multi-Sensor Core Logger (MSCL) gamma-ray density and magnetic susceptibility of gravity cores and push cores from the Escanaba Trough (Gorda Ridge): data release DOI:10.5066/P13B46QX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Adamczyk, Katlin Bowman, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 2025, Computed tomography (CT) scans, photographs, geochemistry, grain-size and total carbon analysis, X-ray fluorescence (XRF) scans, X-ray diffraction (XRD), magnetic susceptibility, and gamma-ray bulk density data of gravity cores and push cores from the Escanaba Trough (Gorda Ridge): data release DOI:10.5066/P13B46QX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Adamczyk, K., Gartman, A., Favela, J., and Tidwell, J., 2025, Computed tomography (CT) scans, photographs, geochemistry, grain-size and total carbon analysis, X-ray fluorescence (XRF) scans, X-ray diffraction (XRD), magnetic susceptibility, and gamma-ray bulk density data of gravity cores and push cores from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey data release, https://doi.org/10.5066/P13B46QX.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -127.5362
    East_Bounding_Coordinate: -127.4076
    North_Bounding_Coordinate: 41.1632
    South_Bounding_Coordinate: 40.6957
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/670045e9d34e80be174aeaa4?name=GC08.JPG&allowOpen=true (JPEG)
    Line plots of gamma density and magnetic susceptibility verses sediment core depth.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Aug-2022
    Ending_Date: 08-Aug-2022
    Currentness_Reference:
    Time data were compiled to completion of the last process step
  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 (54)
    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 .0001. Longitudes are given to the nearest .0001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    GC01-X.csv, GC01-Y.csv, GC01-Z.csv, GC03-X.csv, GC03-Y.csv, GC03-Z.csv, GC04-X.csv, GC04-Y.csv, GC04-Z.csv, GC05-Z.csv, GC06-X.csv, GC06-Y.csv, GC06-Z.csv, GC08-X.csv, GC08-Y.csv, GC08-Z.csv, GC09-Y.csv, GC09-Z.csv, J2-1418-PC03.csv, J2-1418-PC04.csv, J2-1418-PC06.csv, J2-1418-PC08.csv, J2-1418-PC12.csv, J2-1418-PC15.csv, J2-1419-PC01.csv, J2-1419-PC02.csv, J2-1419-PC05.csv, J2-1419-PC11.csv, J2-1419-PC14.csv, J2-1420-PC01.csv, J2-1420-PC02.csv, J2-1420-PC05.csv, J2-1420-PC08.csv, J2-1420-PC11.csv, J2-1420-PC14.csv, J2-1421-PC01.csv, J2-1421-PC02.csv, J2-1421-PC05.csv, J2-1422-PC01.csv, J2-1422-PC04.csv, J2-1422-PC07.csv, J2-1422-PC10.csv, J2-1422-PC13.csv, J2-1424-PC01.csv, J2-1424-PC04.csv, J2-1424-PC07.csv, J2-1424-PC10.csv, J2-1424-PC13.csv, J2-1425-PC01.csv, J2-1426-PC01.csv, J2-1426-PC04.csv, J2-1426-PC07.csv, J2-1426-PC10.csv, J2-1426-PC13.csv
    Comma-separated value (CSV) files containing gamma-density and magnetic susceptibility data. The first row is a header row. The file name corresponds to the core id. TN403_CoreLocations contains the latitude, longitude, and water depth for each core id. The ranges listed in the following attributes represent the combined range domains for all files. (Source: producer defined)
    core_depth
    Measured depth below top of core liner (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:197.0
    Units:centimeters
    Resolution:.1
    gamma_density
    Measured gamma-ray density. Values of -9999 indicate that the gamma density measurements are not available. (Source: producer defined)
    Range of values
    Minimum:-0.431200
    Maximum:2.859100
    Units:grams per cc
    Resolution:.000001
    magnetic_susceptibility
    Measured magnetic susceptibility. Values of -9999 indicate that the magnetic susceptibility measurements are not available. (Source: producer defined)
    Range of values
    Minimum:-0.974400
    Maximum:509.020200
    Units:*10^-5 SI units
    Resolution:.000001

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Katlin Bowman Adamczyk
    • Amy Gartman
    • Jaycee Favela
    • Jacob Tidwell
  2. Who also contributed to the data set?
    Exploring the Seafloor and Oceanic Footprints is an interagency effort involving the National Oceanic and Atmospheric Administration, the U.S. Geological Survey, and the Bureau of Ocean Energy Management. Funding is acknowledged from NOAA Ocean Exploration via its Ocean Exploration Fiscal Year 2019 Funding Opportunity and through the National Oceanographic Partnership Program (NOPP), from the USGS Coastal and Marine Hazards and Resources Enhanced Funding Opportunities, and from the Bureau of Ocean Energy Management through Interagency Agreement M19PG00021 with the United States Geological Survey.
  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?

Data were obtained to characterize downcore geochemical properties of sediments. These data are intended for science researchers, students, policy makers, and the general public.

How was the data set created?

  1. From what previous works were the data drawn?
    TN403_CoreLocations (source 1 of 1)
    Adamczyk, Katlin, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 2025, Location and water depth for gravity cores and push cores from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: U.S. Geological Survey data release
    Source_Contribution:
    Latitude, longitude, and water depth information for gravity cores and push cores from this same data release
  2. How were the data generated, processed, and modified?
    Date: 13-Jun-2022 (process 1 of 2)
    Push core and gravity core samples were collected on the R/V Thomas G. Thompson between May 24, 2022, and June 13, 2022, during the TN403 Escanaba Trough expedition, which was led and staffed by USGS employees. Push cores were pushed into sediment at 37 locations by ROV Jason’s manipulator arm in water depths between 3201 and 3301 meters. Gravity cores were collected using a gravity corer at 7 locations in water depths between 3209 and 3304 meters. Gravity cores greater than 60 cm in length were cut into sections onboard the ship and labeled ‘X’ (0-60 cm), ‘Y’ (60-120 cm), and ‘Z’ (>120 cm). All cores were stored upright and refrigerated until return to shore.
    Date: 08-Aug-2022 (process 2 of 2)
    Whole sediment cores were logged with a Geotek Multi Sensor Core Logger (MSCL) at 1-cm intervals for gamma-ray density and magnetic susceptibility. Gamma-ray density calibration was conducted before logging with a six-step aluminum standard and water enclosed in the same core liner as samples. Magnetic susceptibility calibration was conducted before logging with a stable iron oxide standard. Data presented are calibrated. Person who carried out this activity:
    Katlin Adamczyk
    USGS
    Physical Scientist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7420 (voice)
    kadamczyk@usgs.gov
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    Measurements less than or equal to 0 or missing data values were the result of air voids at the logging location; these voids are common at the top and bottom of cores. Anomalous values for gamma-ray bulk density and magnetic susceptibility were not excluded from the data. Core depths are not corrected for sediment compaction and are relative to the surface of the sediment. No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    The locations of push core samples were determined using ROV Jason’s ultra-short baseline (USBL) navigation. Accuracy for this depth is approximately 6-26 m. The locations of gravity core samples were determined using the R/V Thomas G. Thompson’s GPS navigation, which is accurate to less than 5 m. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted.
  3. How accurate are the heights or depths?
    For push core samples, the vertical accuracy was determined with ROV Jason’s altimeter, which is accurate to less than 1 m. For gravity core samples, the vertical accuracy was determined with the R/V Thomas G. Thompson’s multibeam bathymetry system. No formal positional accuracy tests were conducted.
  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 No access constraints
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 originator(s) 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 .csv format contained in 54 individual files.
  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?

Who wrote the metadata?

Dates:
Last modified: 17-Mar-2025
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_P13B46QX/TN403_MSCL_Metadata.faq.html>
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