{
    "tag": 19513,
    "title": "Molecular (C1-C5 hydrocarbon, CO2, O2, and N2) and \u03b413C-CH4 composition of pressure core, void, and hydrate gases from the Terrebonne Basin, Gulf of America (Gulf of Mexico), Walker Ridge 313 Site",
    "pubdate": "2025",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5281\/zenodo.15626975",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/zenodo\/ZEN_15626975\/USGS-gas_UT-GOM2-2_meta.faq.html",
    "format": null,
    "email": null,
    "descript": "These data include composition of void gas, pressure core gas, and hydrate gas samples collected from the Terrebonne Basin in the Gulf of America (Gulf of Mexico) at Walker Ridge Site H, Holes H003 and H002. Cores were collected during drilling as part of the Deepwater Hydrate Coring Expedition (UT-GOM2-2) in August 2023. This U.S. Department of Energy funded project was focused on better understanding microbial methane generation in marine sediments and characterizing coarse-grained gas hydrate reservoirs. Sediments were recovered continuously down to 155 meters below the seafloor and as spot cored intervals down to 861 meters below the seafloor. Cores were recovered using both conventional and pressure cores. Gas samples were collected from both conventional and pressure cores in order to understand the source of gases in Terrebonne Basin sediments. Gas samples were analyzed for C1-C5 hydrocarbon, CO2, O2, N2, and \u03b413C-CH4 composition using gas chromatography and cavity ringdown spectroscopy.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Phillips, Stephen C.",
            "role": "Author"
        },
        {
            "name": "Pohlman, John W.",
            "role": "Author"
        },
        {
            "name": "Casso, Michael A.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "153",
            "name": "chemical analysis",
            "scope": "Chemical techniques used to identify the composition of substances."
        },
        {
            "thcode": 2,
            "code": "212",
            "name": "core analysis",
            "scope": "Study of the composition and layers of cylindrical samples of rocks, trees, ice, and other materials extracted by drilling into a mass. Intended for broad use for the analysis of all types of core samples. The combination of this term with other terms will convey the context of the activity."
        },
        {
            "thcode": 2,
            "code": "248",
            "name": "diagenesis",
            "scope": "Chemical, physical, and biological changes in sediment during and after its conversion to rock (lithification)."
        },
        {
            "thcode": 2,
            "code": "281",
            "name": "drilling and coring",
            "scope": "Cutting into the subsurface, for example into underground strata, ice, or a tree trunk, to remove material for examination. Intended for broad use wherever coring is done. The combination of this term with other terms will convey the context of the activity."
        },
        {
            "thcode": 2,
            "code": "426",
            "name": "gas chromatography",
            "scope": "Chromatographic technique used to separate or partition the components of a mixture.  Solid and liquid samples are vaporized and passed through a column containing a liquid that differentially absorbs the  molecules."
        },
        {
            "thcode": 2,
            "code": "1773",
            "name": "interagency programs",
            "scope": "Ongoing organizational activities in which USGS works directly with other government agencies"
        },
        {
            "thcode": 2,
            "code": "654",
            "name": "light stable isotope analysis",
            "scope": "Analytical technique using mass spectrometry to measure the different isotopic forms of low mass (light) elements such as oxygen, hydrogen, carbon, nitrogen and sulfur that occur in samples."
        },
        {
            "thcode": 2,
            "code": "2062",
            "name": "piston coring",
            "scope": "Use of a piston mechanism and a weight with a triggering mechanism to drive a coring tube deep into underwater sediments for extraction and study."
        },
        {
            "thcode": 2,
            "code": "2065",
            "name": "rotary drilling",
            "scope": "Use of machinery to drive a rotating bit through earth materials in order to sample below the surface."
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        }
    ],
    "place_term": [],
    "image": [],
    "fan": [
        "2023-021-FA"
    ]
}