Title: Stable Carbon and Oxygen Isotopes Characteristics of the Authigenic Carbonates in Recovered Sediments during IODP 311 Expedition
Abstract:To understand better the responses of authigenic minerals in sediments of the gas hydrate geo-system,some authigenic carbonates in sediments from IODP 311 Expedition were analyzed for the purposes of ...To understand better the responses of authigenic minerals in sediments of the gas hydrate geo-system,some authigenic carbonates in sediments from IODP 311 Expedition were analyzed for the purposes of studying their mineral components,textures,and stable carbon and oxygen isotopes.XRD and SEM results show that Fe-dolomites and calcites are the dominant minerals in the authigenic carbonates,which occurred mainly in pore-rich spheroids and un-regular aggregations.The δ13 CPDB of collected authigenic carbonates recorded the typical extreme negative values is low to-41.50‰,indicating the involvement of methane in the anaerobic oxidation of methane(AOM)under the methane seepage in gas hydrate geo-system.The δ18OPDB of the authigenic carbonates generally decreased with depth,possibly implying a decreasing environment temperature during carbonate precipitation from lower(old) to upper(new) part of sediment column.This study thus has a significant meaning in exploring the potential marine gas hydrate in China and in deciphering the ancient methane hydrate-associated sedimentary records in the Earth history.Read More
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 1
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