Microprobe data for 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: Kha C. Phan
Originator: Isabelle M. Shapiro
Originator: Dawn C.S. Ruth
Originator: Amy Gartman
Publication_Date: 20260407
Title:

Microprobe data for 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/P1KXSK8I

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Phan, K.C., Shapiro, I.M., Ruth, D.C.S., Gartman, A., 2026, Microprobe data for rock samples from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey data release, https://doi.org/10.5066/P1KXSK8I.

Online_Linkage: https://doi.org/10.5066/P1KXSK8I

Description:

Abstract:

This data release contains electron microprobe data collected on thin sections made from 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 and geochemical analyses. Data include element composition, instrument detection limits and error, assigned standards, and analytical methods where applicable.

Purpose:

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

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.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20220524
Ending_Date: 20260218

Currentness_Reference: Date that the last process step was completed

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -127.5281988
East_Bounding_Coordinate: -127.4463434
North_Bounding_Coordinate: 41.08007733
South_Bounding_Coordinate: 40.69571483

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:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
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:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:69975712b66b0100cceed914

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:

All geochemistry data were calibrated against certified reference materials SPI-22 Pentlandite ((Fe,Ni)9S8), SPI-6 Silver Sulfide (Ag2S), SPI-7 Skutterudite ((Co,Ni)As3), and SPI-16 Chalcopyrite (CuFeS2).

Logical_Consistency_Report:

Data are consistent with expectations for the given mineral type. Values fall within expected ranges. Data have been checked for duplication and omission. QMS procedures for the USGS Moffett Field Electron Microbeams Lab were followed during acquisition of the data.

Completeness_Report:

Dataset is considered complete for the information presented, as described in the abstract. Many samples do not have microprobe data because analyses were performed on representative samples only. 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 (m). 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, California.

Process_Date: 20220613

Process_Step:

Process_Description:

In the USGS Pacific Coastal and Marine Science Center Global Seabed Mineral Resources Lab, bulk rock samples were freeze dried, then cut with rock saw and subsampled. Select samples were encased in epoxy resin and sent to Spectrum Petrographics for thin section slicing.

Process_Date: 20230824

Process_Step:

Process_Description:

The JEOL JXA 8530 F+ Electron Probe Microanalyzer was used at the USGS California Volcano Observatory in Moffett Field, California. The microprobe is calibrated using the standards that are in the data file.

Process_Date: 20231101

Process_Step:

Process_Description:

Results from the lab analyses, detection limits, analytical method information, location data, and sample information were combined into a comma-delimited text values document (TN403_Microprobe_data.csv).

Process_Date: 20260218
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Amy Gartman
Contact_Organization: USGS

Contact_Position: Research Oceanographer
Contact_Address:

Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-460-7420
Contact_Electronic_Mail_Address: agartman@usgs.gov

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: 321

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0000001
Longitude_Resolution: 0.00000001
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: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: TN403_Microprobe_data.csv
Entity_Type_Definition:

Comma-delimited file containing results from microprobe analyses of various locations on select rock samples. The value -9999 indicates that no analysis was performed. The value -8888 indicates concentration value below detection limit.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: SAMPLE
Attribute_Definition: Sample name
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Sample IDs that are formatted as J2-####-R##_site# are rock sample from the TN403 expedition. These samples are formatted as Dive#-rock#_Location on rock # (for example J2-1423-R03_site1 is ROV Jason dive number J2-1423, rock number 3, and with the microprobe data collected from site number 1 on the rock face). Sample IDs that are formatted as SPI-## mineral (chemical nomenclature) are the standards used to calibrate the microprobe, and is also used to compare and contrast with the targeted samples during data analysis (for example SPI-7 Skutterudite ((Co,Ni)As3) is the standards 7 provided by SPI Supplies manufacturer, skutterudite mineral, and chemical nomenclature of skutterudite).

Attribute:

Attribute_Label: TAKEOFF
Attribute_Definition: Take off angle of instrument
Attribute_Definition_Source: standard reporting value in geochemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 40
Range_Domain_Maximum: 40
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 10

Attribute:

Attribute_Label: KILOVOLT
Attribute_Definition: Accelerating voltage
Attribute_Definition_Source: standard reporting value in geochemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 20
Range_Domain_Maximum: 20
Attribute_Units_of_Measure: Kiloelectron volts
Attribute_Measurement_Resolution: 10

Attribute:

Attribute_Label: CURRENT
Attribute_Definition: Beam current
Attribute_Definition_Source: standard reporting value in geochemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 20
Range_Domain_Maximum: 20
Attribute_Units_of_Measure: nanoamperes
Attribute_Measurement_Resolution: 10

Attribute:

Attribute_Label: BEAMSIZE
Attribute_Definition: Electron beam diameter
Attribute_Definition_Source: standard reporting value in geochemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 1
Attribute_Units_of_Measure: micrometers
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: Si_WT_PCT
Attribute_Definition:

Silicon weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000138
Range_Domain_Maximum: 2.956410
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Zn_WT_PCT
Attribute_Definition:

Zinc weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000364
Range_Domain_Maximum: 48.311500
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Pb_WT_PCT
Attribute_Definition:

Lead weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.001245
Range_Domain_Maximum: 2.837870
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Fe_WT_PCT
Attribute_Definition:

Iron weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.001928
Range_Domain_Maximum: 64.064600
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Co_WT_PCT
Attribute_Definition:

Cobalt weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000339
Range_Domain_Maximum: 18.013100
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Ni_WT_PCT
Attribute_Definition:

Nickel weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000179
Range_Domain_Maximum: 36.257200
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Cu_WT_PCT
Attribute_Definition:

Copper weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000406
Range_Domain_Maximum: 34.370100
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: S_WT_PCT
Attribute_Definition: Sulfur weight percent in each sample
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.063210
Range_Domain_Maximum: 52.757200
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: As_WT_PCT
Attribute_Definition:

Arsenic weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000904
Range_Domain_Maximum: 79.317900
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Se_WT_PCT
Attribute_Definition:

Selenium weight percent in each sample. The value -9999 indicates that no analysis was performed. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.001492
Range_Domain_Maximum: 0.346679
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Ag_WT_PCT
Attribute_Definition:

Silver weight percent in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000002
Range_Domain_Maximum: 86.211700
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Au_WT_PCT
Attribute_Definition:

Gold weight percentage in each sample. The value -8888 indicates concentration value below detection limit.

Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000299
Range_Domain_Maximum: 0.240760
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: TOTAL
Attribute_Definition: Total weight percent (average for sample) in each sample
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 95.0589
Range_Domain_Maximum: 102.9340
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: Si_CDL99
Attribute_Definition:

Silicon detection limit in elemental weight percent at 99 percent confidence in each sample