Authigenic carbonates related to gas seepage structures in the Sea of Okhotsk (NE offshore Sakhalin): Results from the Chaos Project

Mineralogical and isotopic analysis of authigenic carbonates from different gas hydrate-bearing seepage structures in the Derugin Basin (Sea of Okhotsk) are presented. The analysis showed the existence of four morphological types of carbonates, with all of them mainly of Mg-calcite.13C values of car...

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Bibliographic Details
Main Authors: Krylov, Alexey, Logvina, Elizaveta, Hachikubo, Akihiro, Minami, Hirotsugu, Nunokawa, Yutaka, Shoji, Hitoshi, Mazurenko, Leonid, Matveeva, Tatyana, Obzhirov, Anatoly, Jin, Young Keun
Other Authors: University of British Columbia. Department of Chemical and Biological Engineering, International Conference on Gas Hydrates (6th : 2008 : Vancouver, B.C.)
Format: Conference Object
Language:English
Published: 2008
Subjects:
Gas hydrates
Authigenic carbonates
Okhotsk
Sakhalin
Online Access:http://hdl.handle.net/2429/1173
Description
Summary:Mineralogical and isotopic analysis of authigenic carbonates from different gas hydrate-bearing seepage structures in the Derugin Basin (Sea of Okhotsk) are presented. The analysis showed the existence of four morphological types of carbonates, with all of them mainly of Mg-calcite.13C values of carbonates generally light owing to the inheritance of carbon from microbial methane. 13C-enriched samples at the VNIIOkeangeologia structure with 13C values of up to +9.3‰ represent carbonate precipitation due to methanogenesis. The calculated equilibrium 18O values of carbonates in general correspond to measured values. Non UBC Unreviewed

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