Jason D. Chaytor Nancy G. Prouty 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 Nancy G. Prouty Jason D. Chaytor 2022 tabular digital data 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 Results are presented from Accelerator Mass Spectrometry (AMS) carbon-14 radiocarbon dating of carbonate rock samples collected from seep fields offshore the U.S. Mid- and South Atlantic in 2018 and 2019. 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=2019-620-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. 20180828 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 Chemical analysis radiometric dating carbon-14 analysis Marine Realms Information Bank (MRIB) keywords ecosystems chemical oceanography 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:615770f9d34e0df5fb9fc37d 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

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Jason D Chaytor (USGS WHCMSC) Microsoft Excel for Microsoft 365 MSO Minze Stuiver Henry A. Polach 1977 publication Stuiver, M., and Polach, H.A., 1977, Discussion reporting of 14C data: Radiocarbon, v. 19, pp. 355-363. https://doi.org/10.1017/S0033822200003672 All samples submitted to NOSAMS are checked for accuracy via the primary standard for 14C measurements - NBS Oxalic Acid I (NIST-SRM-4990). Every group of samples processed includes an appropriate blank, analyzed concurrently. Process blank materials include but are not limited to Carrara marble (IAEA C-1) and Icelandic Doublespar (Third International Radiocarbon Intercomparison F) for inorganic carbon. Data have been check for omissions and duplicates. Dataset represents analysis of a set of subsamples from larger primary samples recovered during the field activities. Primary samples were selected for collection at a limited number of sites during dives and represent only a small portion of the exposed authigenic carbonate material. Positioning data for HOV Alvin (AT41) and ROV Jason II (RB1903) are derived from the fusion of several different sensors installed on the underwater vehicles (doppler velocity logs, gyrocompasses and inertial navigation systems) and the surface vessels (ultra-short baseline acoustic transponders and differential/augmented GPS receivers). Based on the stated accuracy of each of the sensors on the ships and vehicles, horizontal location accuracy is expected to be be better than 10 m. Depth accuracy based on calibrated pressure sensors is 0.1 meters National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility 20210913 publication https://www2.whoi.edu/site/nosams/ Digital and/or Hardcopy 20210913 Date when lab analyses were completed AMS carbon-14 dating An accelerator mass spectrometer (AMS) was used to measure inorganic radiocarbon 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 saw to expose fresh surfaces. Subsamples were isolated using trim saws, diamond drills and hand scribes. AMS carbon-14 dating 2021 Jason Chaytor USGS Research Geologist mailing and physical

384 Woods Hole Road

Woods Hole MA 02543 USA (508) 457-2351 jchaytor@usgs.gov Point Point 13 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 AMS carbon-14 radiocarbon dating of authigenic carbonate samples. Producer defined. Cruise ID Identification number of DEEPSEARCH cruise on which samples were collected. Producer defined AT41 AT41=R/V Atlantis [AT] and sequential cruise number. The corresponding USGS Field Activity Number (FAN) for this sample collection is 2018-042-FA. Producer defined RB1903 NOAA Ship Ron Brown [RB] and [20XX year, month]. The corresponding USGS Field Activity Numbers (FANs) for this sample collection are 2019-003-FA and 2019-620-FA. Producer defined Vessel Name of ship on which samples were collected Producer defined. R/V Atlantis The R/V Atlantis is a research vessel owned and operated by Woods Hole Oceanographic Institution Producer defined NOAA Ship Ronald H. Brown The NOAA Ship Ronald H. Brown is a research vessel owned and operated by the National Oceanic and Atmospheric Administration (NOAA) Producer defined Site Site Name where samples were collected Producer defined. List of Site names Date Collected Date [YYYY-MM-DD] Producer defined. 2018-08-28 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, 1=first rock collected). Producer defined. List of sample IDs Depth meters below sea level Producer defined. 235 2165 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 Split ID U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center (WHCMSC) unique subsample ID based on the field activity number (e.g., 18042), unique cruise sample ID (e.g. A4967-R2), analysis type (e.g., RC=radiocarbon) and sequential number of subsamples analyzed Producer defined. Unique subsample ID Date Reported Date analysis results returned from the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility Producer defined. 07/24/2020 09/13/2021 Type Sample type submitted for dating Producer defined. authigenic carbonate material extracted from a sample of authigenic carbonate Producer defined mollusc Mollusc shell extracted from authigenic carbonate sample Producer defined Process Method used by NOSAMS to produce CO2 from samples Producer defined. hydrolysis acid hydrolysis process Producer defined Accession # Unique analysis ID from NOSAMS Producer defined. unique analysis ID number F Modern The measured deviation of the 14C/12C ratio from Modern. Modern is defined as 95 percent of the 14C concentration of the National Bureau of Standards Oxalic Acid I standard (SRM 4990B) normalized to d13C VPDB (-19ppm) in 1950 AD (VPDB = Vienna Pee Dee Belemnite geological standard. standard reporting values in carbon-14 radicarbon analysis, defined in Stuiver and Polach (1977) 0.0658 0.6382 unitless 0.0001 Fm Error Fraction modern (Fm) Error is a measurement of the deviation of the delta-Carbon-14/delta-Carbon-12 ratio of a sample from modern carbon (Stuiver and Polach, 1977). standard reporting values in carbon-14 radicarbon analysis, defined in Stuiver and Polach (1977) 0.0008 0.0016 unitless 0.0001 Age Conventional Radiocarbon Age calculated using the radiocarbon decay equation (Stuiver and Polach, 1977). >Modern indicates a fraction modern greater than 1 with Modern defined as 95% of the radiocarbon concentration in AD 1950 of National Bureau of Standards Oxalic Acid I Producer defined. 3,610 21,900 years 10 Age Err Standard error for Conventional Radiocarbon Age. Producer Defined 20 170 years 5 d13C Delta-C-13 is a measure of the ratio of stable isotopes Carbon-13:Carbon-12, reported in parts per thousand (per mil). defined in Stuiver and Polach (1977) -50.93 -8.13 parts per thousand (per mil) 0.01 d13C Source Method by which d13C was obtained for the sample (measured=measured by NOSAMS during sample analysis) Producer Defined measured by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility during sample analysis D14C Report the D14C value as defined in Stuiver and Pollach (1977) as the relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and d13C. The D14C is age corrected to account for decay that took place between collection (or death) and the time of measurement so that two measurements of the same sample made years apart will produce the same calculated D14C result. Collection year must be specified in order for D14C results to be calculated. Stuiver and Pollach (1977) -367.05 -934.70 per mil 0.01 Authigenic Carbonate Material Type of material sampled from within the subsample (groundmass, cement, or shell) Producer Defined Cement Secondary calcium carbonate binding groundmass components together Producer defined Bulk Undifferentiated subsample containing groundmass and cement or unprocessed mollusc shell material Producer defined The first line of the tab-delimited text file is a header line. U.S. Geological Survey U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov These data are available in a text file (DEEPSEARCH_AC_radiocarbon.csv) which contains radiocarbon results from selected 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 0.03 https://www.sciencebase.gov/catalog/file/get/61576cdbd34e0df5fb9fc371 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

2885 Mission Street

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