Thermogravimetric Analysis of rock samples from the Escanaba Trough (Gorda Ridge)

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Isabelle M. Shapiro
Originator: Kha C. Phan
Originator: Amy Gartman
Publication_Date: 20260520
Title:

Thermogravimetric Analysis of rock samples from the Escanaba Trough (Gorda Ridge)

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P13WN2F7

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Shapiro, I.M., Phan, K.C., and Gartman, A., 2026, Thermogravimetric Analysis of rock samples from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey data release, https://doi.org/10.5066/P13WN2F7.

Online_Linkage: https://doi.org/10.5066/P13WN2F7

Description:

Abstract:

This data release contains data collected using a thermogravimetric analyzer (TGA) of rock samples collected from the Escanaba Trough hydrothermal vent field, Gorda Ridge, in the northeast Pacific Ocean. These data were collected in 2022 on expedition TN403 (USGS Field Activity 2022-621-FA). Samples were taken to the USGS Pacific Coastal Marine Science Center for subsampling before being run on the Thermogravimetric analyzer. Temperature ramp under both oxygenated conditions (sample purge gas is air) and deoxygenate conditions (sample purge gas is nitrogen gas) and the corresponding sample weight of samples are provided in this dataset.

Purpose:

These data serve to expand the knowledge and statistics for deep ocean marine mineral occurrences and composition within the US Exclusive Economic Zone and global ocean.

Supplemental_Information:

Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/services/activity.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.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20220524
Ending_Date: 20260317

Currentness_Reference:

ground condition at the time data were collected through when last process step was completed

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -127.5358
East_Bounding_Coordinate: -127.4463
North_Bounding_Coordinate: 41.0820
South_Bounding_Coordinate: 40.6957

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Nonliving Resources
Theme_Keyword: Material Resources
Theme_Keyword: Mineral Resources
Theme_Keyword: Physical/Chemical Features
Theme_Keyword: Assessments

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: metallic mineral resources
Theme_Keyword: marine geology

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: sediment geochemistry
Theme_Keyword: mineral resources
Theme_Keyword: chemical analysis

Theme:

Theme_Keyword_Thesaurus: None
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
Theme_Keyword: Global Ocean Mineral Resources
Theme_Keyword: mineralogical analysis

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:69c577f0b66b013bc37be791

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Escanaba Trough
Place_Keyword: Gorda Ridge

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. These data are marked with a Creative Common CC0 1.0 Universal License. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data.

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

Native_Data_Set_Environment: Mac OSX 11.6.1, Microsoft Excel 16.47.1 for Mac

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Thermogravimetric analyzer is calibrated to weight and temperature by instrument manufacturers.

Logical_Consistency_Report:

Each sample was run in triplicate to verify consistency across sample runs.

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:

The location of rock samples were determined using ROV Jason's ultra-short baseline (USBL) navigation. Accuracy for this depth is approximately 6-26 meters. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical accuracy was determined with ROV Jason's altimeter, which is accurate to less than 1 m. No formal positional accuracy tests were conducted.

Lineage:

Process_Step:

Process_Description:

Rock 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. Rocks were collected from the seafloor using the ROV Jason's manipulator arm at water depths between 3192 and 3319 meters. Rock samples were frozen immediately upon recovery from the ROV, stored frozen, and shipped on ice to the USGS Pacific Coastal and Marine Science Center in Santa Cruz, CA.

Process_Date: 20220613

Process_Step:

Process_Description:

In the USGS Pacific Coastal and Marine Science Center Global Seabed Mineral Resources Lab, rock samples were subsampled, freeze dried, and then ground to a powder using a shatterbox and ceramic-lined bowls and ceramic pucks. Ceramic-lined bowls and pucks were cleaned thoroughly with quartz powder and detergents between samples to avoid cross-contamination.

Process_Date: 20230824

Process_Step:

Process_Description:

Powdered samples were sifted to isolate a size fraction of 75 to 150 microns, then loaded into a PerkinElmer Pyris TGA 9 thermogravimetric analysis system. Small aliquots of each sample were run in triplicate with ultra-high purity compressed nitrogen flowing through the chamber, and in triplicate with compressed laboratory air with an in-line filter, with samples being disposed of after each run. Samples were run with pre-programed temperature ramp from 30 to 300 degrees Celsius at either 5, 10, or 15 degrees Celsius per minute.

Process_Date: 20250930
Source_Produced_Citation_Abbreviation: results

Process_Step:

Process_Description:

Results from the Thermogravimetric analyses were combined into a comma-delimited text values document (TN403_TGA.csv).

Source_Used_Citation_Abbreviation: results
Process_Date: 20260317

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: 382070

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: TN403_TGA.csv
Entity_Type_Definition:

Comma-delimited file containing results from thermogravimetric analyses of bulk marine mineral samples. The accompanying table TN403_Location.csv includes corresponding location and depth information about each sample.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Sample_name
Attribute_Definition: The sample ID for each sample
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The sample ID of each sample. Samples follow a similar pattern of Dive #-rock number-composition-Sample Purge Gas-run number. For example, j2-1418-r03-bulk-n2s1sf is a size fractionated sample (sf) of rock number 3 from Jason 2 dive number J2-1418, with bulk composition, and the first run (s1) using nitrogen gas (n2) as the sample purge gas. Variations from this name scheme are when the sample name is modified with 5deg and 10deg, which show that this sample was run with the temperature ramp of 5 or 10 degrees Celsius per minute instead of the standard 15. Some sample names also include "parta" or "partb" which refer to the original rock subsample taken from a larger rock during sampling.

Attribute:

Attribute_Label: Sample_purge_gas
Attribute_Definition: The gas that was in the chamber while the sample was run.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: N2
Enumerated_Domain_Value_Definition: this sample was run in nitrogen gas
Enumerated_Domain_Value_Definition_Source: producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: air
Enumerated_Domain_Value_Definition: this sample was run in air.
Enumerated_Domain_Value_Definition_Source: producer defined

Attribute:

Attribute_Label: Rate
Attribute_Definition:

This is the rate that the temperature increases by, in degrees Celsius per minute

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5
Range_Domain_Maximum: 15
Attribute_Units_of_Measure: Degrees C per min
Attribute_Measurement_Resolution: 5

Attribute:

Attribute_Label: Time
Attribute_Definition: This is the time of the run for each sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00000
Range_Domain_Maximum: 56.98350
Attribute_Units_of_Measure: minutes
Attribute_Measurement_Resolution: 0.00001

Attribute:

Attribute_Label: Program_Temperature
Attribute_Definition: This is the temperature of the chamber.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 30.009
Range_Domain_Maximum: 599.992
Attribute_Units_of_Measure: degrees Celsius
Attribute_Measurement_Resolution: 0.001

Attribute:

Attribute_Label: Sample_Temperature
Attribute_Definition: This is the internal temperature of the sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 29.232
Range_Domain_Maximum: 595.372
Attribute_Units_of_Measure: degrees Celsius
Attribute_Measurement_Resolution: 0.001

Attribute:

Attribute_Label: Sample_Purge_Flow
Attribute_Definition:

This is the pressure at which the sample gas entered the chamber.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 16.45
Range_Domain_Maximum: 20.03
Attribute_Units_of_Measure: pounds per square inch (PSI)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: System_Purge_Flow
Attribute_Definition:

This is the pressure at which the gas not entering the chamber was cycled through the instrument. Where the system purge flow is zero, the flow was not functioning but should not impact the quality of the reported data.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 40.06
Attribute_Units_of_Measure: pounds per square inch (PSI)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Unsubtracted_Weight
Attribute_Definition: This is the weight of the sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.9234
Range_Domain_Maximum: 12.4293
Attribute_Units_of_Measure: mg
Attribute_Measurement_Resolution: 0.0001

Detailed_Description:

Entity_Type:

Entity_Type_Label: TN403_Location.csv
Entity_Type_Definition:

Comma-delimited file containing longitude, latitude, and depth information for the samples in the associated data file TN403_TGA.csv.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Sample_name
Attribute_Definition: The sample ID for each sample
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Attribute:

Attribute_Label: Latitude
Attribute_Definition: This is the latitude of the sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 40.6957
Range_Domain_Maximum: 41.0820
Attribute_Units_of_Measure: Decimal degrees
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: Longitude
Attribute_Definition: This is the longitude of the sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -127.5358
Range_Domain_Maximum: -127.4463
Attribute_Units_of_Measure: Decimal degrees
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: Depth_meters
Attribute_Definition: This is the depth of the sample.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3198
Range_Domain_Maximum: 3284
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Overview_Description:

Entity_and_Attribute_Overview:

This data release includes 2 comma separated values (CSV) data files containing thermogravimetric analyses of bulk marine mineral samples (TN403_TGA.csv) and the associated location information (TN403_Location.csv). The first line of the csv file is a header line. The "Sample_name" field can be used to join the two data files.

Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

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 .csv format contained in a single file accompanied by CSDGM FGDC-compliant metadata.

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: comma-delimited text
Format_Version_Number: Microsoft Excel 16.16.17 for Mac
Format_Information_Content: File contains table in .csv format
File_Decompression_Technique: No compression applied
Transfer_Size: 1.77

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P13WN2F7

Access_Instructions:

Data can be downloaded using the Network_Resource_Name link and scrolling down to the TGA section.

Fees: None.

Technical_Prerequisites:

These data can be viewed with Microsoft Excel or any text reader.

Metadata_Reference_Information:

Metadata_Date: 20260520
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

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P13WN2F7/TGA_metadata.html>