Sea floor responses to hydrocarbon seeps,Louisiana continental slope |
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| Authors: | H H Roberts P Aharon R Carney J Larkin R Sassen |
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| Institution: | (1) Coastal Studies Institute and Department of Geology and Geophysics, School of Geoscience, Louisiana State University, 70803 Baton Rouge, LA, USA;(2) Department of Geology and Geophysics, School of Geoscience, Louisiana State University, 70803 Baton Rouge, LA, USA;(3) Coastal Ecology Laboratory, Center for Wetland Resources, Louisiana State University, 70803 Baton Rouge, LA, USA;(4) Department of Microbiology, College of Basic Sciences, Louisiana State University, 70803 Baton Rouge, LA, USA;(5) BP Exploration, 9401 Southwest Freeway, 77074 Houston, TX, USA |
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| Abstract: | Observations and samples from research submersible dives confirm that brines, crude oil, fluid mud, and gases are common seep
products. Through this mechanism a unique interplay of geochemical, geologic, and biological processes resulting in unusual
sea floor features ranging from carbonate-rich nodular sediments to mounds with tens of meters relief. Stable carbon isotopes
occluded in the carbonates provide a permanent imprint that links these authigenic carbonates to by-products of microbial
breakdown of crude oil and gas. Recent DSV ALVIN dives confirm that hydrocarbon seeps and their accompanying chemosynthetic
communities and authigenic carbonate mounds occur over the entire depth range of the slope. |
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