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

• Main Authors: Krylov, Alexey, Logvina, Elizaveta, Hachikubo, Akihiro, Minami, Hirotsugu, Nunokawa, Yutaka, Shoji, Hitoshi, Mazurenko, Leonid, Matveeva, Tatyana, Obzhirov, Anatoly, Jin, Young Keun
• Format: Text
• Language: English
• Published: The University of British Columbia 2017
• Subjects: Sakhalin
• Online Access: https://dx.doi.org/10.14288/1.0041015; https://doi.library.ubc.ca/10.14288/1.0041015

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. ...