Geochemical constraints on the distribution of gas hydrates in the Gulf of Mexico |
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Authors: | C K Paull W Ussler III T Lorenson W Winters J Dougherty |
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Institution: | (1) Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039, USA;(2) United States Geological Survey, Menlo Park, CA 94025, USA;(3) United States Geological Survey, Woods Hole, MA 02543, USA |
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Abstract: | Gas hydrates are common within near-seafloor sediments immediately surrounding fluid and gas venting sites on the continental
slope of the northern Gulf of Mexico. However, the distribution of gas hydrates within sediments away from the vents is poorly
documented, yet critical for gas hydrate assessments. Porewater chloride and sulfate concentrations, hydrocarbon gas compositions,
and geothermal gradients obtained during a porewater geochemical survey of the northern Gulf of Mexico suggest that the lack
of bottom simulating reflectors in gas-rich areas of the gulf may be the consequence of elevated porewater salinity, geothermal
gradients, and microbial gas compositions in sediments away from fault conduits. |
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