Nancy G. Prouty Jason Chaytor 20220811 comma-delimited text data release DOI:10.5066/P9DRU8TP Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9DRU8TP https://www.sciencebase.gov/catalog/folder/61576cdbd34e0df5fb9fc371 Jason Chaytor Nancy G. Prouty 2021 data release DOI:10.5066/P9DRU8TP Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9DRU8TP Geochemical analysis of carbonate rock samples collected from seep fields on the RB1903 and AT41 research expeditions in the U.S. Mid- and South Atlantic. Samples were collected as a fingerprint to past hydrocarbon seep activity, fluid source, and depositional environment. These samples were collected as part of the Deep Sea Exploration to Advance Research on Coral/Canyon/Cold seep Habitats (DEEP SEARCH) study, a multiyear, multi-agency campaign to characterize the deep-sea ecosystems to better understand the distribution of sensitive seafloor communities to inform potential offshore energy development and other deep-sea management. Additional information about the field activities from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-314-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-003-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2018-042-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20180821 20190427 Ground condition at time data were collected. Complete None planned -76.1907 -74.7924 35.9274 32.4938 ISO 19115 Topic Category oceans environment geoscientificInformation Data Categories for Marine Planning Habitat USGS Thesaurus gas hydrate resources geochemistry light stable isotopic analysis chemical analysis Marine Realms Information Bank (MRIB) keywords geochemistry methanogens None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC USGS Metadata Identifier USGS:61576cdbd34e0df5fb9fc371 Geographic Names Information System (GNIS) Atlantic Ocean None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey, Bureau of Ocean Energy Management (BOEM), and the National Oceanic and Atmospheric Administration (NOAA) as the originators 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 Peter Swart (university of Miami), Angela Tan (USGS PCMSC), Colin Carney (University of California, Santa Cruz) Microsoft Excel 16.53 for Mac. Swart, Peter K. Murray, Sean T. Staudigel, Phillip T. Hodell, David D. 2019 https://doi.org/10.1029/2019GC008209 All geochemistry data were calibrated against known standards No formal logical accuracy tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. Both the research vessel and remotely occupied vehicle are equipped with navigational systems and conduct checks to assess the accuracy of the horizontal positioning. A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Both the research vessel and remotely occupied vehicle are equipped with navigational systems and conduct checks to assess the accuracy of the vertical positioning. University of Miami, Rosenstiel School of Marine and Atmospheric Sciences (RSMAS), Stable Isotope Geochemistry Isotope Laboratory 2021 http://mgg.rsmas.miami.edu/groups/sil/clumped.html carbonate lab samples 20210129 Date when lab analyses were completed clumped isotopes Stable carbon and oxygen isotopes were measured using Thermoscientific 253 isotope ratio mass spectrometer. USGS Pacific Coastal and Marine Science Center sediment laboratory 2020 carbonate lab samples 20200527 Date when lab analyses were completed Total carbon (TC), Total inorganic carbon (TIC), and Total organic carbon Total carbon (TC), total inorganic carbon (TIC), and total organic carbon contents of bulk sediment were determined coulometrically (CM 5015 coulometer; UIC, Inc.) at the USGS Pacific Coastal and Marine Science Center sediment lab. University of California, Santa Cruz (UCSC) Stable Isotope Laboratory 2019 https://sites.google.com/ucsc.edu/sil carbonate lab samples 20190109 Date when lab analyses were completed dissolved inorganic carbon Carbonate samples were analyzed for carbon and oxygen stable isotopes using a Thermo-Finnigan MAT 253 with a Kiel IV Automated Carbonate Prep Device Stanford University Stable Isotope and Carbon System Laboratory 2020 https://ccoc.stanford.edu/labs/stanford-stable-isotope-and-carbon-system-laboratory carbonate lab samples 20200116 Date when lab analyses were completed dissolved inorganic carbon Carbonate samples were analyzed for carbon and oxygen stable isotopes using a Thermo-Finnigan MAT 252 with a Kiel III Automated Carbonate Prep Device Authigenic carbonate samples were collected during HOV and ROV dives. Samples were rinsed with freshwater, allowed to dry, photographed and stored at room temperature. 2020 Authigenic carbonate samples were cut using a diamond band saw to expose fresh surfaces. Subsamples, including discretely drilled powders for isotope and carbon analysis, in order to isolate cement from different precipitation events. Results from the different labs were combined into one spreadsheet. Empty cells are designated by -9999 indicating no analysis was performed. Stanford UCSC RSMAS 2020 Point Point 46 0.0001 0.0001 Decimal degrees D_WGS_1984 D_WGS_1984 6378137.000000 298.257224 A comma-delimited text file with the first line being a header line. Output of geochemical analysis of authigenic carbonate samples. Producer defined. Cruise Name of cruise on which samples were collected. The name of the cruise may contain a ship abbreviation and year (Ron Brown=RB1903 and [20XX year, month], AT41=R/V Atlantis and sequential cruise number). Producer defined List of cruise names Ship Name of ship on which samples were collected Producer defined. List of cruise names Site Name Site Name where samples were collected Producer defined. List of Site names Date Date [YYYY-MM-DD] Producer defined. 2018-08-21 2019-04-27 Sample ID Unique cruise sample ID based on cruise ID (e.g., RB1903, AT41), submersible (J2=JASON II, AL=Alvin), dive number (e.g., 1133; 4967), sample storage location (e.g., B5=biobox 5, RB=rear biobox), and sample number (e.g., R1 with R=rock). Producer defined. List of sample IDs Depth meters above seafloor Producer defined. 235 2169 meters 1 Latitude Latitude of sample location Producer defined. 32.4938 35.9274 decimal degrees 0.0001 Longitude Longitude of sample location Producer defined. -76.1907 -74.7924 decimal degrees 0.0001 Total carbon Total carbon measured in carbonate sample Producer defined. 5.887 10.830 percent 0.001 Total organic carbon Total organic carbon measured in carbonate sample Producer defined. 0.069 0.752 percent 0.001 Total inorganic carbon Total inorganic carbon measured in carbonate sample Producer defined. 5.336 10.583 percent 0.001 Calcium carbonate Total calcium carbonate measured in carbonate sample Producer defined. 44.463 88.184 percent 0.001 delta-C-13 delta-C-13 is a measure of the ratio of stable isotopes Carbon-13:Carbon-12, reported in parts per thousand (per mil). standard reporting values in isotope chemistry -47.65 -38.07 parts per thousand (per mil) 0.01 delta-O-18 delta-O-18 is a measure of the ratio of stable isotopes Oxygen-18:Oxygen-16, reported in parts per thousand (per mil). standard reporting values in isotope chemistry 2.87 4.24 parts per thousand (per mil) 0.01 Delta-47 Clumped isotope measurement following methods from Swart and others (2019) by examining the clumping of C-13 and O-18 isotopes within a single carbonate phase Producer defined. 0.630 0.661 per mil 0.001 Delta-47 standard deviation Standard deviation of Delta-47 measurements based on replicate measurements Producer defined. 0.001 0.210 per mil 0.001 Temperature Delta-47 derived temperature for the reaction at 90°C following the calibration equation from Swart and others (2019) Swart and others (2019) 5.90 15.10 degrees Celsius 0.01 Temperature error Error associated with temperature calculations based on replicated of Delta-47 measurements Swart and others (2019) 0.40 8.00 degrees Celsius 0.01 The first line of the tab-delimited text 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 a text file (DEEPSEARCH_Carbonates_Isotopes.csv) which contains seawater carbonate analysis and CTD data for all collected water samples. 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 16.53 ASCII text file none 0.08 https://www.sciencebase.gov/catalog/file/get/61576cdbd34e0df5fb9fc371 https://www.sciencebase.gov/catalog/item/61576cdbd34e0df5fb9fc371 https://doi.org/10.5066/P9DRU8TP Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page for the water parameter data and its metadata. The third link points to a landing page for the entire data release. None. These data can be viewed with any text editor software. 20220811 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