The stable isotopic composition of sediments in methane fluid flowing area, Haiyang IV, the northern part of South China Sea

YU Xiao-guo; JIN Xiao-bing; YAO Xu-ying; GONG Jian-ming

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Journal of Marine Sciences ›› 2013, Vol. 31 ›› Issue (3) : 1-7.

The stable isotopic composition of sediments in methane fluid flowing area, Haiyang IV, the northern part of South China Sea

YU Xiao-guo^1,2, JIN Xiao-bing^1,2, YAO Xu-ying^1,2, GONG Jian-ming³

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Abstract

Sediments from the site GC16 of Haiyang IV, the South China Sea show anomalous values of δ¹³C_org, δ¹⁵N and δ¹³C_inorg. The sulfate methane transition zone (SMTZ) is a key biochemical interface in CH₄ fluid flowing area. The values of δ¹³C_org and δ¹⁵N show obviously depleted in STMZ. Comparing with the date above the STMZ, depleted 1.4‰PDB and 0.93‰ respectively within the zone. The data of δ¹³C_inorg also identify the authigenic carbonates as microbially-mediated methane-derived precipitates. The 2 times of vigorous methane-rich fluid expulsion had occurred since the bottom sediments deposition of the core. The depth of methane fluid arriving coincident with the up limited of STMZ.

Key words

stable isotopic composition / SMTZ / AOM / ammonia oxidation

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YU Xiao-guo, JIN Xiao-bing, YAO Xu-ying, GONG Jian-ming. The stable isotopic composition of sediments in methane fluid flowing area, Haiyang IV, the northern part of South China Sea[J]. Journal of Marine Sciences. 2013, 31(3): 1-7

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