Kha C. Phan Isabelle M. Shapiro Dawn C.S. Ruth Amy Gartman 20260407 comma-delimited text data release DOI: 10.5066/P1KXSK8I Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey 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. https://doi.org/10.5066/P1KXSK8I 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. These data serve to expand the knowledge and statistics for deep ocean marine mineral occurrences and composition within the global ocean. 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. 20220524 20260218 Date that the last process step was completed Complete None planned -127.5281988 -127.4463434 41.08007733 40.69571483 ISO 19115 Topic Category oceans geoscientificInformation Data Categories for Marine Planning Nonliving Resources Material Resources Mineral Resources Physical/Chemical Features Assessments USGS Thesaurus metallic mineral resources Marine Realms Information Bank (MRIB) keywords mineral resources chemical analysis None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Global Ocean Mineral Resources USGS Metadata Identifier USGS:69975712b66b0100cceed914 Geographic Names Information System (GNIS) Pacific Ocean NGA GEOnet Names Server (GNS) Escanaba Trough Gorda Ridge No access 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. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Mac OSX 11.6.1, Microsoft Excel 16.47.1 for Mac 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). 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. 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. 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 accuracy was determined with ROV Jason's altimeter, which is accurate to less than 1 m. No formal positional accuracy tests were conducted. 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. 20220613 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. 20230824 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. 20231101 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). 20260218 Amy Gartman USGS Research Oceanographer Mailing and Physical

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Santa Cruz CA 95060 831-460-7420 agartman@usgs.gov Point Point 321 0.0000001 0.00000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 TN403_Microprobe_data.csv 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. Producer defined SAMPLE Sample name Producer defined 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). TAKEOFF Take off angle of instrument standard reporting value in geochemistry 40 40 degrees 10 KILOVOLT Accelerating voltage standard reporting value in geochemistry 20 20 Kiloelectron volts 10 CURRENT Beam current standard reporting value in geochemistry 20 20 nanoamperes 10 BEAMSIZE Electron beam diameter standard reporting value in geochemistry 1 1 micrometers 1 Si_WT_PCT Silicon weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000138 2.956410 percent 0.000001 Zn_WT_PCT Zinc weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000364 48.311500 percent 0.000001 Pb_WT_PCT Lead weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.001245 2.837870 percent 0.000001 Fe_WT_PCT Iron weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.001928 64.064600 percent 0.000001 Co_WT_PCT Cobalt weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000339 18.013100 percent 0.000001 Ni_WT_PCT Nickel weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000179 36.257200 percent 0.000001 Cu_WT_PCT Copper weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000406 34.370100 percent 0.000001 S_WT_PCT Sulfur weight percent in each sample producer defined 0.063210 52.757200 percent 0.000001 As_WT_PCT Arsenic weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000904 79.317900 percent 0.000001 Se_WT_PCT Selenium weight percent in each sample. The value -9999 indicates that no analysis was performed. The value -8888 indicates concentration value below detection limit. producer defined 0.001492 0.346679 percent 0.000001 Ag_WT_PCT Silver weight percent in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000002 86.211700 percent 0.000001 Au_WT_PCT Gold weight percentage in each sample. The value -8888 indicates concentration value below detection limit. producer defined 0.000299 0.240760 percent 0.000001 TOTAL Total weight percent (average for sample) in each sample producer defined 95.0589 102.9340 percent 0.0001 Si_CDL99 Silicon detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.006067 0.017558 percent 0.000001 Zn_CDL99 Zinc detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.015460 0.045448 percent 0.000001 Pb_CDL99 Lead detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.107365 0.139955 percent 0.000001 Fe_CDL99 Iron detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.018016 0.024335 percent 0.000001 Co_CDL99 Cobalt detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.010337 0.015530 percent 0.000001 Ni_CDL99 Nickel detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.011543 0.016502 percent 0.000001 Cu_CDL99 Copper detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.013148 0.019520 percent 0.000001 S_CDL99 Sulfur detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.007119 0.039308 percent 0.000001 As_CDL99 Arsenic detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.005046 0.041041 percent 0.000001 Se_CDL99 Selenium detection limit in elemental weight percent at 99 percent confidence in each sample. The value -9999 indicates that no analysis was performed. standard reporting value in geochemistry 0.007830 0.015541 percent 0.000001 Ag_CDL99 Silver detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.009111 0.012433 percent 0.000001 Au_CDL99 Gold detection limit in elemental weight percent at 99 percent confidence in each sample standard reporting value in geochemistry 0.059539 0.075222 percent 0.000001 Si_PCT_ERR Silicon analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.240124 3105.740000 percent 0.000001 Zn_PCT_ERR Zinc analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.136088 8407.750000 percent 0.000001 Pb_PCT_ERR Lead analytical error in relative percent (one sigma) in each sample. The value -8888 indicates concentration value below detection limit. standard reporting value in geochemistry 0.047074 4443.750000 percent 0.000001 Fe_PCT_ERR Iron analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.197570 590.759000 percent 0.000001 Co_PCT_ERR Cobalt analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.206524 16926.900000 percent 0.000001 Ni_PCT_ERR Nickel analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.155462 6634.400000 percent 0.000001 Cu_PCT_ERR Copper analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.158790 757639.000000 percent 0.000001 S_PCT_ERR Sulfur analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.168935 29.672800 percent 0.000001 As_PCT_ERR Arsenic analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.070883 2711424.000000 percent 0.000001 Se_PCT_ERR Selenium analytical error in relative percent (one sigma) in each sample. The value -9999 indicates that no analysis was performed. standard reporting value in geochemistry 2.19014 440.26500 percent 0.00001 Ag_PCT_ERR Silver analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 0.079011 190858.000000 percent 0.000001 Au_PCT_ERR Gold analytical error in relative percent (one sigma) in each sample standard reporting value in geochemistry 10.1215 3082770.0000 percent 0.0001 DATETIME Acquisition date and time (excel number code format) for each sample standard reporting value in geochemistry 45896.70222 45912.66432 Not applicable 0.00001 Si_STD_NUM Silicon primary standard assignment number producer defined 72 Silicon primary assigned number producer defined Zn_STD_NUM Zinc primary standard assignment number producer defined 131 Zinc primary assigned number producer defined Pb_STD_NUM Lead primary standard assignment number producer defined 127 Lead primary assigned number producer defined Fe_STD_NUM Iron primary standard assignment number producer defined 129 Iron primary assigned number producer defined Co_STD_NUM Cobalt primary standard assignment number producer defined 117 Cobalt primary assigned number producer defined Ni_STD_NUM Nickel primary standard assignment number producer defined 132 Nickel primary assigned number producer defined Cu_STD_NUM Copper primary standard assignment number producer defined 126 Copper primary assigned number producer defined S_STD_NUM Sulfur primary standard assignment number producer defined 129 Sulfur primary assigned number producer defined As_STD_NUM Arsenic primary standard assignment number producer defined 111 Arsenic primary assigned number producer defined Se_STD_NUM Selenium primary standard assignment number. The value -9999 indicates that no analysis was performed. producer defined 115 Selenium primary assigned number producer defined Ag_STD_NUM Silver primary standard assignment number producer defined 116 Silver primary assigned number producer defined Au_STD_NUM Gold primary standard assignment number producer defined 113 Gold primary assigned number producer defined Si_STD_NAM Silicon primary standard assignment name producer defined MAC2-22 Quartz Silicon standard name producer defined Zn_STD_NAM Zinc primary standard assignment name producer defined SPI-21 Zinc Sulfide (ZnS) Zinc standard name producer defined Pb_STD_NAM Lead primary standard assignment name producer defined SPI-17 Galena (PbS) Lead standard name producer defined Fe_STD_NAM Iron primary standard assignment name producer defined SPI-19 Pyrite (FeS2) Iron standard name producer defined Co_STD_NAM Cobalt primary standard assignment name producer defined SPI-7 Skutterudite ((Co,Ni)As3) Cobalt standard name producer defined Ni_STD_NAM Nickel primary standard assignment name producer defined SPI-22 Pentlandite ((Fe,Ni)9S8) Nickel standard name producer defined Cu_STD_NAM Copper primary standard assignment name producer defined SPI-16 Chalcopyrite (CuFeS2) Copper standard name producer defined S_STD_NAM Sulfur primary standard assignment name producer defined SPI-19 Pyrite (FeS2) Sulfur standard name producer defined As_STD_NAM Arsenic primary standard assignment name producer defined SPI-1 Gallium Arsenide (GaAs) Arsenic standard name producer defined Se_STD_NAM Selenium primary standard assignment name. Blank values indicate that no analysis was performed. producer defined SPI-5 Selenium (Se) Selenium standard name producer defined Ag_STD_NAM Silver primary standard assignment name producer defined SPI-6 Silver Sulfide (Ag2S) Silver standard name producer defined Au_STD_NAM Gold primary standard assignment name producer defined SPI-3 Gold (Au) Gold standard name producer defined The first line of the csv file is a header line. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in .csv format contained in a single file. 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. comma-delimited text Microsoft Excel 16.16.17 for Mac File contains table in .csv format No compression applied 0.262 https://doi.org/10.5066/P1KXSK8I Data can be downloaded using the Network_Resource_Name link. None. These data can be viewed with Microsoft Excel or any text reader. 20260407 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998