Stable Carbon and Oxygen Isotopes Characteristics of the Authigenic Carbonates in Recovered Sediments during IODP 311 Expedition

Abstract

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 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 δ¹³C_PDBof 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 δ¹⁸O_PDB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.

Key words: IODP 311 Expedition, sediment, authigenic carbonate, stable isotopes of carbon and oxygen

CLC Number:

P736.4

WANG Xiao-qin, WANG Jia-sheng, WEI Qing, CHEN Qi, LI Qing,HU Gao-wei, GAO Yu-ya. Stable Carbon and Oxygen Isotopes Characteristics of the Authigenic Carbonates in Recovered Sediments during IODP 311 Expedition[J]. Geoscience, 2008, 22(3): 397-401.

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