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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