Katlin Bowman Adamczyk Amy Gartman Jaycee Favela Kira Mizell Isabelle M. Shapiro Kha C. Phan 20260623 comma-delimited text data release doi:10.5066/P149BW9Z Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P149BW9Z Katlin Bowman Adamczyk Amy Gartman Jaycee Favela Kira Mizell Isabelle M. Shapiro Kha C. Phan 2026 data release doi:10.5066/P149BW9Z Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey Suggested Citation: Adamczyk, K.B., Gartman, A., Favela, J., Mizell, K., Shapiro, I.M., and Phan, K.C., 2026, Abundance and geochemistry of abyssal ferromanganese nodules and ferromanganese coated rocks from the Samoa Basin (2026-604-FA): U.S. Geological Survey data release, https://doi.org/10.5066/P149BW9Z. https://doi.org/10.5066/P149BW9 Ferromanganese nodules and other ferromanganese coated rocks were collected using a box core from the Samoa Basin, during USGS field activity 2026-604-FA. These mineral samples were described and subsampled for geochemical analysis at the USGS Pacific Coastal and Marine Science Center. Geochemical analyses were completed by an outside commercial laboratory, and the results were provided to the USGS. Geochemical data, sample type and size range, as well as location information (latitude, longitude, depth) for each sample are provided here. The abundance of ferromanganese minerals in each box core sample, in units of kilograms per square meter of seafloor, is included in a separate part of this data release. These data serve to expand the knowledge and statistics for seabed mineral occurrences and composition within the global ocean. The expedition 2026-604-FA was the third leg of the National Oceanic and Atmospheric Administration's American Samoa Abyssal Mapping effort, OPR-T900-KR-26. The USGS effort was supported in part by Interagency Agreement M20PG00028 between the USGS and the Bureau of Ocean and Energy Management. Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2026-604-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20260413 20260428 ground condition at time data were collected Complete None planned -167.31544 -165.62022 -13.46984 -16.73279 ISO 19115 Topic Category oceans geoscientificInformation Data Categories for Marine Planning Nonliving Resources Material Resources Mineral Resources Physical/Chemical Features Assessments USGS Thesaurus chemical analysis mass spectroscopy geochemistry box coring marine geology rocks and deposits mineral deposits metallic mineral resources Marine Realms Information Bank (MRIB) keywords seabed chemical analysis mineral resources box coring marine geology None U.S. Geological Survey USGS Geology, Energy, and Minerals Mission Area GEMMA Pacific Coastal and Marine Science Center PCMSC Global Ocean Mineral Resources USGS Metadata Identifier USGS:6a1769adb66b01122d755be2 Geographic Names Information System (GNIS) South Pacific Ocean Territory of American Samoa NGA GEOnet Names Server (GNS) Samoa Basin No access constraint 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 Commons 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

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov The expedition 2026-604-FA was the third leg of the National Oceanic and Atmospheric Administration's American Samoa Abyssal Mapping effort, OPR-T900-KR-26. The USGS effort was supported in part by Interagency Agreement M20PG00028 between the USGS and the Bureau of Ocean and Energy Management. Microsoft Windows 11 Enterprise, Microsoft Excel 15 Certified reference materials, including NOD-A-1 (Atlantic Ocean Mn Nodule), NOD-P-1 (Pacific Ocean Mn Nodule), FeMn-1 (Peru Basin Mn Nodule) were measured for all reported elements. The average relative percent difference (RPD) between measured and certified concentrations was 10-20 percent for Se (ICP_MS_4ACID), In, Cr, TI, and Te. Higher average RPDs were observed for Na (30 percent) and K (36 percent). Average RPDs for all other elements were <10 percent. Analytical and procedural duplicate measurements were made for all analytical techniques. The average RPD between duplicate measurements was 10-20 percent for TI, In, Ge, Cl, and Ag. Higher average RPDs were observed for Hg (35 percent) and I (54 percent). Average RPDs for all other elements were <10 percent. The instruments and techniques used to generate geochemical data are included in the data table and also summarized below in the Source Citations since data were generated by commercial laboratories. Limits for each analyte's detection by an instrument are reported in the table. The value -8888 indicates that the measurement for an analyte was below the detection limit. Values of -9999 indicate that no analysis was performed. The sum of all element concentrations, in units of parts per million, was calculated to ensure the total did not exceed 1,000,000. 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. A Kongsberg Acoustic Positioning Operator Station (APOS) calibration was completed using the ship's GPS data and a fixed seabed transponder. The standard deviation of the transponder position was N1.26 meters and E1.34 meters. A Kongsberg Acoustic Positioning Operator Station (APOS) calibration was completed using the ship's GPS data and a fixed seabed transponder. The standard deviation of the transponder depth was 1.31 meters. National Oceanic and Atmospheric Administration 2026 https://oceanexplorer.noaa.gov/mineral-samples/2026-nv5-american-samoa/ online database 20260428 Date that final image was captured. Box Core Sample Photos Shipboard images of box core samples. Actlabs, Ancaster, Ontario, Canada 2026 https://actlabs.com/geochemistry/ geochemical analyses 20260512 20260529 Date range during which official lab reports were released by Actlabs geochemistry Element concentration and moisture data Ferromanganese nodules and ferromanganese coated rocks were collected from the Samoa Basin during the U.S. Geological Survey's 2026 American Samoa box coring effort (2026-604-FA). Ferromanganese nodules and ferromanganese coated rock samples were collected from the seabed using an Ocean Instruments BX-750 Box Corer deployed from the M/V Ocean Guardian. An AML Oceanographic CTD (conductivity temperature depth) and Kongsberg MiniS 37 -40V Ti transponder were mounted to the frame of the box core to determine the depth and location of each seafloor sample. 20260428 Top water was removed from the box core using a peristaltic pump and tubing, then a photograph of the box core surface was captured. All Box Core Sample Photos are available online through NOAA at https://oceanexplorer.noaa.gov/mineral-samples/2026-nv5-american-samoa/. Box Core Sample Photos 20260428 Surface ferromanganese nodules and ferromanganese coated rocks were immediately removed from the box core after top water removal and box core surface photography, then transferred to a laboratory van. Buried ferromanganese nodules were recovered from four box cores (BX03, BX32, BX33, BX36) during subcoring (collection of push cores), push core processing, or by hand-searching the remaining sediment after subcores were removed. The sediment depth in these four box core samples ranged from 34-40 centimeters. Excess sediment was removed by rinsing the mineral samples with filtered seawater. Samples were air-dried, packaged in bubble wrap, stored at room temperature, then shipped to the USGS Pacific Coastal and Marine Science Center (PCMSC) for processing. 20260428 Ferromanganese nodules and ferromanganese coated rock samples were photographed and described, then bulk portions were crushed to a powder using a ceramic-lined grinding container and Shatterbox, or by hand using an agate mortar and pestle. A portion of each sample analyzed for this data release is archived in the Global Seabed Mineral Resources rock collection at PCMSC. Bulk mineral powders were sent to ActLabs for geochemical analysis. 20260505 ActLabs dried mineral powder samples overnight in a 40 degree Celsius oven, then hand pulverized powders with an agate mortar and pestle to 105 microns. The water content (H2O-) was measured for each dried and pulverized sample using gravimetric analysis, and this value was used to normalize element concentrations by sorbed water content. Geochemical analysis was performed on dried and pulverized samples. Method details for each reported element are included as attributes in this data release. geochemistry 20260529 The sorbed water content (H2O-) measured by gravimetric analysis in dried and pulverized powder samples was used to normalize element concentrations in each sample to sorbed-water-free values using the following formula: water normalized = [raw element concentration]/[(100 - weight percent water)/100]. Weight percent water in dried and pulverized powders ranged from 4.2 to 9.6 percent in samples, and 0.4 to 6.1 percent in certified reference materials. geochemistry 20260529 The location of the box core on the seafloor was determined from the deepest ultra-short baseline (USBL) location (BX06 and BX28) or by calculating the midpoint latitude and longitude of the deepest measured USBL coordinates from the up and down cast of each box core. Only downcast USBL data was available for BX06 and only upcast USBL data was available for BX28. Box core samples BX 03-05, 17, and 25 did not have functioning USBL data; the location of the surface vessel at the time the box core made contact with the seafloor is reported instead. The water depth of each box core sample was determined by extracting the deepest measured depth value from the box core CTD data and correcting this depth for the mounted height of the CTD (2 meters from the base of the box core). 20260527 Geochemistry results from ActLabs, detection limits, analytical method information, location data, and sample information were combined into a comma-delimited text values document (2026-604-FA_NoduleGeochemistry.csv). geochemistry 20260529 Point Point 120 0.00001 0.00001 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257222101 local sea surface 1 meters Attribute values 2026-604-FA_NoduleGeochemistry.csv table containing sample ID, sample type, and size class information, and box core sample location and depth. Producer defined Sample_ID The sample ID for each sample Producer defined Sample IDs are formatted as Cruise ID-Box Core ID_sample identifier. For example, ‘2026-604-FA-BX05_rep4' is the fourth rock sampled from box core BX05 during 2026-604-FA. Sample IDs that end in ‘_dup' are procedural duplicates. Sample_Type Description of sample material Producer defined bulk nodule The bulk, or entire stratigraphic section from nucleus to surface, of a marine ferromanganese nodule. This sample includes ferromanganese mineral and its associated nuclei substrate. producer defined bulk coated sediment The bulk of marine ferromanganese-coated sediment. This sample includes ferromanganese mineral and associated sediment. producer defined bulk coated pumice The bulk of marine ferromanganese-coated pumice. This sample includes ferromanganese mineral and associated volcanic pumice. producer defined bulk ferromanganese, no nuclei The bulk, or entire stratigraphic section of a marine ferromanganese nodule. This sample is pure ferromanganese mineral and does not contain nuclei substrate. producer defined bulk buried nodule The bulk, or entire stratigraphic section from nucleus to surface, of a marine ferromanganese nodule that was recovered from below the sediment surface. This sample includes ferromanganese mineral and its associated nuclei substrate. producer defined certified reference material This is a certified reference material submitted to the commercial laboratory with a false sample ID to blind test the accuracy of measurement techniques. Certified reference materials analyzed include Nod-A-1 (bulk nodule; https://www.usgs.gov/media/files/nod-1-geochemical-reference-material-information-sheet), Nod-P-1 (bulk nodule; https://www.usgs.gov/media/files/nod-p-1-geochemical-reference-material-information-sheet), FeMn-1 (bulk nodule; https://iageo.com/wp-content/uploads/2020/06/FeMn-1-RM-information-sheet-21May2020.pdf), and OREAS 520 (iron oxide copper-gold ore and magnetite-bearing waste rock; https://www.oreas.com/crm/oreas-520/). producer defined Min_Dimension The minimum dimension, in centimeter units, of the mineral sample. Values of -9999 indicate that measurements are not available due to fragmentation of the sample. producer defined 0.5 6.0 centimeters .1 Max_Dimension The maximum dimension, in centimeter units, of the mineral sample. Values of -9999 indicate that measurements are not available due to fragmentation of the sample. producer defined 1.0 8.5 centimeters .1 Latitude Latitude where the box core made contact with the seafloor. Values of -9999 indicate that the sample is certified reference material, and positional information is not applicable. producer defined -16.73279 -13.46984 decimal degrees .00001 Longitude Longitude where the box core made contact with the seafloor. Values of -9999 indicate that the sample is certified reference material, and positional location is not applicable. producer defined -167.31544 -165.62022 decimal degrees .00001 Location_Source The source of latitude and longitude data for the sample. Values of -9999 indicate that the sample is certified reference material, and positional information is not applicable. producer defined ship The latitude and longitude data are the position of the surface vessel when the box core made contact with the seafloor. producer defined usbl downcast The location of the box core on the seafloor is the deepest measured USBL coordinate from the downcast. producer defined usbl avg The location of the box core on the seafloor was determined by calculating the average latitude and longitude of the deepest measured USBL coordinates from the up and down casts. producer defined usbl upcast The location of the box core on the seafloor is the deepest measured USBL coordinate from the upcast. producer defined Water_Depth Water depth where the box core sample was collected. This depth was determined using a CTD mounted to the box core frame. producer defined 5412 5724 meters 1 Fe Iron concentration in each sample. standard reporting value in geochemistry 57710 200650 parts per million 1 Mn Manganese concentration in each sample. standard reporting value in geochemistry 2530 343300 parts per million 1 Si Silicon concentration in each sample. standard reporting value in geochemistry 18060 222040 parts per million 1 Al Aluminum concentration in each sample. standard reporting value in geochemistry 13810 73750 parts per million 1 Mg Magnesium concentration in each sample. standard reporting value in geochemistry 10210 30670 parts per million 1 Ca Calcium concentration in each sample. standard reporting value in geochemistry 11850 116160 parts per million 1 Na Sodium concentration in each sample. standard reporting value in geochemistry 3080 25920 parts per million 1 K Potassium concentration in each sample. standard reporting value in geochemistry 1150 34870 parts per million 1 Ti Titanium concentration in each sample. standard reporting value in geochemistry 1840 18120 parts per million 1 P Phosphorus concentration in each sample. standard reporting value in geochemistry 640 10310 parts per million 1 H2OP Quantity of H2O+, or structural water, in each sample. standard reporting value in geochemistry 14000 126000 parts per million 1000 Ag Silver concentration in each sample. standard reporting value in geochemistry. .03 .43 parts per million .01 As Arsenic concentration in each sample. standard reporting value in geochemistry 22.5 296.1 parts per million .1 Ba Barium concentration in each sample. standard reporting value in geochemistry 87 8673 parts per million 1 Be Beryllium concentration in each sample. standard reporting value in geochemistry .89 6.23 parts per million .01 Bi Bismuth concentration in each sample. standard reporting value in geochemistry 1.01 13.93 parts per million .01 Cd Cadmium concentration in each sample. standard reporting value in geochemistry .05 24.66 parts per million .01 Cl Chlorine concentration in each sample. Values of -9999 indicate that no analysis was performed. standard reporting value in geochemistry 1106 15393 parts per million 1 Co Cobalt concentration in each sample. standard reporting value in geochemistry 84 4912 parts per million 1 Cr Chromium concentration in each sample. standard reporting value in geochemistry 10 376 parts per million 1 Cs Caesium concentration in each sample. standard reporting value in geochemistry .33 2.01 parts per million .01 Cu Copper concentration in each sample. Values of -7777 indicate that the measurement was above the detection limit. standard reporting value in geochemistry 325 11620 parts per million 1 F Fluorine concentration in each sample. Values of -9999 indicate that no analysis was performed. Values of -8888 indicate that the measurement was below the detection limit. standard reporting value in geochemistry 110 1210 parts per million 10 Ga Gallium concentration in each sample. standard reporting value in geochemistry 10.0 32.6 parts per million .1 Ge Germanium concentration in each sample. standard reporting value in geochemistry .45 2.40 parts per million .01 Hf Hafnium concentration in each sample. standard reporting value in geochemistry 3.2 16.5 parts per million .1 Hg Mercury concentration in each sample. Values of -8888 indicate that the measurement was below the detection limit. standard reporting value in geochemistry .005 .203 parts per million .001 I Iodine concentration in each sample. Values of -9999 indicate that no analysis was performed. standard reporting value in geochemistry 43.4 1338.4 parts per million .1 In Indium concentration in each sample. standard reporting value in geochemistry .10 1.04 parts per million .01 Li Lithium concentration in each sample. standard reporting value in geochemistry 17.2 283.7 parts per million .1 Mo Molybdenum concentration in each sample. standard reporting value in geochemistry 2.5 639.0 parts per million .1 Nb Niobium concentration in each sample. standard reporting value in geochemistry 7.1 144.6 parts per million .1 Ni Nickel concentration in each sample. standard reporting value in geochemistry 72 14090 parts per million 1 Pb Lead concentration in each sample. standard reporting value in geochemistry 6.2 1107.5 parts per million .1 Rb Rubidium concentration in each sample. standard reporting value in geochemistry 9.5 110.6 parts per million .1 Re Rhenium concentration in each sample. Values of -8888 indicate that the measurement was below the detection limit. standard reporting value in geochemistry .029 .030 parts per million .001 S Sulfur concentration in each sample. standard reporting value in geochemistry 840 9750 parts per million 10 Sb Antimony concentration in each sample. standard reporting value in geochemistry 1.82 69.08 parts per million .01 Sc Scandium concentration in each sample. standard reporting value in geochemistry 7.5 38.5 parts per million .1 Se Selenium concentration in each sample. Values of -8888 indicate that the measurement was below the detection limit. standard reporting value in geochemistry 0.7 12.3 parts per million .1 Sn Tin concentration in each sample. standard reporting value in geochemistry 1.1 7.9 parts per million .1 Sr Strontium concentration in each sample. standard reporting value in geochemistry 101 1597 parts per million 1 Ta Tantalum concentration in each sample. standard reporting value in geochemistry .21 18.35 parts per million .01 Te Tellurium concentration in each sample. standard reporting value in geochemistry .3 31.6 parts per million .1 Th Thorium concentration in each sample. standard reporting value in geochemistry 6.8 50.2 parts per million .1 Tl Thallium concentration in each sample. standard reporting value in geochemistry .4 179.4 parts per million .1 U Uranium concentration in each sample. standard reporting value in geochemistry .64 17.59 parts per million .01 V Vanadium concentration in each sample. standard reporting value in geochemistry 269 619 parts per million 1 W Tungsten concentration in each sample. standard reporting value in geochemistry 2.6 84.8 parts per million .1 Zn Zinc concentration in each sample. standard reporting value in geochemistry 20 1824 parts per million 1 Zr Zirconium concentration in each sample. standard reporting value in geochemistry 136 692 parts per million 1 La Lanthanum concentration in each sample. standard reporting value in geochemistry 15 303 parts per million 1 Ce Cerium concentration in each sample. standard reporting value in geochemistry 79 1317 parts per million 1 Pr Praseodymium concentration in each sample. standard reporting value in geochemistry 4 79 parts per million 1 Nd Neodyium concentration in each sample. standard reporting value in geochemistry 16 306 parts per million 1 Sm Samarium concentration in each sample. standard reporting value in geochemistry 3.8 60.4 parts per million .1 Eu Europium concentration in each sample. standard reporting value in geochemistry 1.00 15.75 parts per million .01 Gd Gadolinium concentration in each sample. standard reporting value in geochemistry 3.9 53.7 parts per million .1 Tb Terbium concentration in each sample. standard reporting value in geochemistry .63 8.21 parts per million .01 Dy Dysprosium concentration in each sample. standard reporting value in geochemistry 3.8 47.0 parts per million .1 Y Yttrium content in each sample. standard reporting value in geochemistry 15.8 181.2 parts per million .1 Ho Holmium concentration in each sample. standard reporting value in geochemistry .75 9.09 parts per million 0.01 Er Erbium concentration in each sample. standard reporting value in geochemistry 2.2 25.9 parts per million 0.1 Tm Thulium concentration in each sample. standard reporting value in geochemistry .31 3.77 parts per million .01 Yb Ytterbium concentration in each sample. standard reporting value in geochemistry 2.0 25.4 parts per million .1 Lu Lutetium concentration in each sample. standard reporting value in geochemistry .31 4.10 parts per million .01 Fe_Detection The detection limit for iron concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Mn_Detection The detection limit for manganese concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Si_Detection The detection limit for silicon concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Al_Detection The detection limit for aluminum concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Mg_Detection The detection limit for magnesium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ca_Detection The detection limit for calcium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Na_Detection The detection limit for sodium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million K_Detection The detection limit for potassium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ti_Detection The detection limit for titanium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million P_Detection The detection limit for phosphorus concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million H2OP_Detection The detection limit for H2O+, or structural water, concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Ag_Detection The detection limit for silver concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million As_Detection The detection limit for arsenic concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ba_Detection The detection limit for barium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Be_Detection The detection limit for beryllium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Bi_Detection The detection limit for bismuth concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Cd_Detection The detection limit for cadmium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Cl_Detection The detection limit for chlorine concentration based on the measurement method and instrumentation. Values of -9999 indicate that no analysis was performed. Producer defined Numerical value provided by the analyzer in parts per million Co_Detection The detection limit for cobalt concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Cr_Detection The detection limit for chromium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Cs_Detection The detection limit for cesium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Cu_Detection The detection limit for copper concentration based on the measurement method and instrumentation Producer defined 1 50 parts per million 1 F_Detection The detection limit for fluorine concentration based on the measurement method and instrumentation. Values of -9999 indicate that no analysis was performed. Producer defined Numerical value provided by the analyzer in parts per million Ga_Detection The detection limit for gallium concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Ge_Detection The detection limit for germanium concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Hf_Detection The detection limit for hafnium concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Hg_Detection The detection limit for mercury concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million I_Detection The detection limit for iodine concentration based on the measurement method and instrumentation. Values of -9999 indicate that no analysis was performed. Producer defined Numerical value provided by the analyzer in parts per million In_Detection The detection limit for indium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Li_Detection The detection limit for lithium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Mo_Detection The detection limit for molybdenum concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Nb_Detection The detection limit for niobium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ni_Detection The detection limit for nickel concentration based on the measurement method and instrumentation Producer defined 5 30 parts per million 1 Pb_Detection The detection limit for lead concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Rb_Detection The detection limit for rubidium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Re_Detection The detection limit for rhenium concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million S_Detection The detection limit for sulfur concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Sb_Detection The detection limit for antimony concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Sc_Detection The detection limit for scandium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Se_Detection The detection limit for selenium concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Sn_Detection The detection limit for tin concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Sr_Detection The detection limit for strontium concentration based on the measurement method and instrumentation Producer defined .2 2.0 parts per million .1 Ta_Detection The detection limit for tantalum concentration based on the measurement method and instrumentation. Producer defined Numerical value provided by the analyzer in parts per million Te_Detection The detection limit for tellurium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Th_Detection The detection limit for thorium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Tl_Detection The detection limit for thallium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million U_Detection The detection limit for uranium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million V_Detection The detection limit for vanadium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million W_Detection The detection limit for tungsten concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Zn_Detection The detection limit for zinc concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Zr_Detection The detection limit for zirconium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million La_Detection The detection limit for lanthanum concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ce_Detection The detection limit for cerium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Pr_Detection The detection limit for praseodymium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Nd_Detection The detection limit for neodymium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Sm_Detection The detection limit for samarium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Eu_Detection The detection limit for europium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Gd_Detection The detection limit for gadolinium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Tb_Detection The detection limit for terbium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Dy_Detection The detection limit for dysprosium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Y_Detection The detection limit for yttrium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Ho_Detection The detection limit for holmium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Er_Detection The detection limit for erbium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Tm_Detection The detection limit for thulium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Yb_Detection The detection limit for ytterbium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Lu_Detection The detection limit for lutetium concentration based on the measurement method and instrumentation Producer defined Numerical value provided by the analyzer in parts per million Fe_method An alphanumeric code that denotes the method and instrumentation used to measure iron concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Mn_method An alphanumeric code that denotes the method and instrumentation used to measure manganese concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Si_method An alphanumeric code that denotes the method and instrumentation used to measure silicon concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Al_method An alphanumeric code that denotes the method and instrumentation used to measure aluminum concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Mg_method An alphanumeric code that denotes the method and instrumentation used to measure magnesium concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Ca_method An alphanumeric code that denotes the method and instrumentation used to measure calcium concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Na_method An alphanumeric code that denotes the method and instrumentation used to measure sodium concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined K_method An alphanumeric code that denotes the method and instrumentation used to measure potassium concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Ti_method An alphanumeric code that denotes the method and instrumentation used to measure titanium concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined P_method An alphanumeric code that denotes the method and instrumentation used to measure phosphorus concentration Producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined H2OP_method An alphanumeric code that denotes the method and instrumentation used to measure H2O+, or structural water, concentration. Producer defined GRAV_IR gravimetric and penfield IR producer defined Ag_method An alphanumeric code that denotes the method and instrumentation used to measure silver concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined As_method An alphanumeric code that denotes the method and instrumentation used to measure aresenic concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Ba_method An alphanumeric code that denotes the method and instrumentation used to measure barium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Be_method An alphanumeric code that denotes the method and instrumentation used to measure beryllium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Bi_method An alphanumeric code that denotes the method and instrumentation used to measure bismuth concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Cd_method An alphanumeric code that denotes the method and instrumentation used to measure cadmium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Cl_method An alphanumeric code that denotes the method and instrumentation used to measure chlorine concentration Values of NaN indicate that no analysis was performed. Producer defined INAA Instrumental Neutron Activation Analysis producer defined Co_method An alphanumeric code that denotes the method and instrumentation used to measure cobalt concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Cr_method An alphanumeric code that denotes the method and instrumentation used to measure choromium concentration Producer defined ICP-OES_4ACID Inductively Coupled Plasma Optical Emission Spectroscopy, four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Cs_method An alphanumeric code that denotes the method and instrumentation used to measure choromium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Cu_method An alphanumeric code that denotes the method and instrumentation used to measure copper concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined F_method An alphanumeric code that denotes the method and instrumentation used to measure fluorine concentration. Values of NaN indicate that no analysis was performed. Producer defined FUS-ISE Lithium Borate Fusion with Ion Selective Electrode producer defined Ga_method An alphanumeric code that denotes the method and instrumentation used to measure gallium concentration. Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Ge_method An alphanumeric code that denotes the method and instrumentation used to measure germanium concentration. Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Hf_method An alphanumeric code that denotes the method and instrumentation used to measure hafnium concentration. Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Hg_method An alphanumeric code that denotes the method and instrumentation used to measure mercury concentration. Producer defined CVAAS Cold Vapor Atomic Absorption Spectroscopy producer defined I_Method An alphanumeric code that denotes the method and instrumentation used to measure iodine concentration. Values of NaN indicate that no analysis was performed. Producer defined INAA Instrumental Neutron Activation Analysis producer defined In_method An alphanumeric code that denotes the method and instrumentation used to measure indium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Li_method An alphanumeric code that denotes the method and instrumentation used to measure lithium concentration based on the measurement method and instrumentation Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Mo_method An alphanumeric code that denotes the method and instrumentation used to measure molybdenum concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Nb_method An alphanumeric code that denotes the method and instrumentation used to measure niobium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Ni_method An alphanumeric code that denotes the method and instrumentation used to measure nickel concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined XRF_BF X-Ray Fluorescence (XRF) on borate fused disks producer defined Pb_method An alphanumeric code that denotes the method and instrumentation used to measure lead concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Rb_method An alphanumeric code that denotes the method and instrumentation used to measure rubidium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Re_method An alphanumeric code that denotes the method and instrumentation used to measure rubidium concentration. Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined S_method An alphanumeric code that denotes the method and instrumentation used to measure sulfur concentration Producer defined ICP_OES_4ACID Inductively Coupled Plasma Optical Emission Spectroscopy, low-mineralized strong acid digestion producer defined Sb_method An alphanumeric code that denotes the method and instrumentation used to measure antimony concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Sc_method An alphanumeric code that denotes the method and instrumentation used to measure scandium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Se_method An alphanumeric code that denotes the method and instrumentation used to measure selenium concentration. Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Sn_method An alphanumeric code that denotes the method and instrumentation used to measure tin concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Sr_method An alphanumeric code that denotes the method and instrumentation used to measure strontium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Ta_method An alphanumeric code that denotes the method and instrumentation used to measure tantalum concentration. Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Te_method An alphanumeric code that denotes the method and instrumentation used to measure tellurium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Th_method An alphanumeric code that denotes the method and instrumentation used to measure thorium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined Tl_method An alphanumeric code that denotes the method and instrumentation used to measure thallium concentration Producer defined ICP_MS_4ACID Inductively Coupled Plasma Mass Spectrometry (ICP-MS) following a four-acid digest of hydrochloric, hydrofluoric, nitric, perchloric acids producer defined U_method An alphanumeric code that denotes the method and instrumentation used to measure uranium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined V_method An alphanumeric code that denotes the method and instrumentation used to measure vanadium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined W_method An alphanumeric code that denotes the method and instrumentation used to measure tungsten concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Zn_method An alphanumeric code that denotes the method and instrumentation used to measure zinc concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Zr_method An alphanumeric code that denotes the method and instrumentation used to measure zirconium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined La_method An alphanumeric code that denotes the method and instrumentation used to measure lanthanum concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Ce_method An alphanumeric code that denotes the method and instrumentation used to measure cerium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Pr_method An alphanumeric code that denotes the method and instrumentation used to measure praseodymium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Nd_method An alphanumeric code that denotes the method and instrumentation used to measure neodymium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Sm_method An alphanumeric code that denotes the method and instrumentation used to measure samarium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Eu_method An alphanumeric code that denotes the method and instrumentation used to measure europium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Gd_method An alphanumeric code that denotes the method and instrumentation used to measure gadolinium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Tb_method An alphanumeric code that denotes the method and instrumentation used to measure terbium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Dy_method An alphanumeric code that denotes the method and instrumentation used to measure dysprosium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Y_method An alphanumeric code that denotes the method and instrumentation used to measure yttrium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Ho_method An alphanumeric code that denotes the method and instrumentation used to measure holmium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Er_method An alphanumeric code that denotes the method and instrumentation used to measure erbium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Tm_method An alphanumeric code that denotes the method and instrumentation used to measure thulium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Yb_method An alphanumeric code that denotes the method and instrumentation used to measure ytterbium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined Lu_method An alphanumeric code that denotes the method and instrumentation used to measure lutetium concentration Producer defined ICP_MS_FUS Inductively Coupled Plasma Mass Spectrometry, Lithium Borate Fusion producer defined This dataset contains one comma separated values (CSV) file (2026-604-FA_NoduleGeochemistry.csv) describing sample and positional information, geochemical analyses results, measurement detection limits, and methods. The first line of the csv file is a header line. The abundance of ferromanganese minerals in each box core sample, in units of kilograms per square meter of seafloor, is included in a separate part of this data release. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in .csv format contained in a single file accompanied by CSDGM FGDC-compliant metadata. 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 15 File contains table in .csv format No compression applied 0.167 https://doi.org/10.5066/P149BW9Z Data can be downloaded using the Network_Resource_Name link and scrolling down to the Water normalized major and trace element geochemistry dataset. None. These data can be viewed with Microsoft Excel or any text reader. 20260623 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