MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION OF HYDROCARBON SEEP SEDIMENTS FROM THE GULF OF MEXICO

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dc.contributor.author Canet C.
dc.contributor.author Prol-Ledesma R.M.
dc.contributor.author Mortera-Gutiérrez C.
dc.contributor.author Linares C.
dc.contributor.author Escobar-Briones E.
dc.contributor.author Cruz R.L.S.
dc.contributor.author Cienfuegos E.
dc.contributor.author Morales-Puente P.
dc.date.accessioned 2024-12-07T09:08:04Z
dc.date.available 2024-12-07T09:08:04Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=14683422
dc.identifier.citation Marine and Petroleum Geology, 2006, 23, 5, 605-619
dc.identifier.issn 0264-8172
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/46859
dc.description.abstract A common characteristic of the Gulf of Mexico (GOM) seafloor, hydrocarbon seepage produces asphalt volcanism, brine pools, gas hydrates and authigenic carbonates. We studied authigenic carbonates from two areas: Green Canyon (Louisiana slope, 1000 mbsl) and the Chapopote diapir (abyssal plain, southwestern GOM, 2900 mbsl). Carbonates consist of oily, matrix-supported limestones with variable porosity and a fine-grained matrix of calcite. They occur in Green Canyon as both concretions formed below the seafloor and as slabs of seabed pavements. In each case, the carbonates are mudstones with a mud matrix consisting of high-Mg calcite, disseminated pyrite and detrital quartz. The carbonate slabs have vug microporosity and contain barite that occurs as vug lining. The precipitation of barite results from a reaction between barium-rich and sulfate-free seep fluids and downwards-diffusing seawater. The carbonates in Chapopote occur in relation to tar flows and form crusts of wackestones with bivalve shells. The matrix is composed by low-Mg calcite with disseminated pyrite and detrital quartz. The carbonate mud shows depletion in 13C, with δ13C between -36.9‰ and -23.0‰. Carbonates precipitate as a consequence of anaerobic methane oxidation coupled with seawater sulfate reduction. δ18O values (3.4-4.4‰) suggest precipitation at temperatures between 5 and 9 °C. © 2006 Elsevier Ltd. All rights reserved.
dc.subject BARITE
dc.subject CARBONATES
dc.subject COLD SEEPS
dc.subject STABLE ISOTOPES
dc.title MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION OF HYDROCARBON SEEP SEDIMENTS FROM THE GULF OF MEXICO
dc.type Статья
dc.identifier.doi 10.1016/j.marpetgeo.2006.05.002


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