Molecular distributions and carbon isotopic compositions of fatty acids in the surface sediments from Shenhu Area,northern South China Sea

ZHU Xiaowei; MAO Shengyi; WU Nengyou; SUN Yongge; GUAN Hongxiang

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ZHU Xiaowei, MAO Shengyi, WU Nengyou, SUN Yongge, GUAN Hongxiang. Molecular distributions and carbon isotopic compositions of fatty acids in the surface sediments from Shenhu Area,northern South China Sea[J]. Haiyang Xuebao, 2013, 35(6): 75-85.

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Molecular distributions and carbon isotopic compositions of fatty acids in the surface sediments from Shenhu Area,northern South China Sea

1.
Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China;Guangzhou Center for Gas Hydrate Research, CAS, Guangzhou 510640, China
2.
Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, CAS, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, CAS, Guangzhou 510640, China
3.
Department of Geosciences, Zhejiang University, Hangzhou 310037, China

Received Date: 2012-10-08

Abstract

Abstract

The lipid biomarkers of fatty acids in the surface sediments from Shenhu Area,northern South China Sea continental slope were investigated in the present paper. The total contents of the fatty acid from the sediments amounts to 5.14 ~ 8.99 μg/g,and its carbon number ranges from C₁₂ to C₃₂. The fatty acid includes 48 types such as the saturated fatty acid,branched fatty acid,monounsaturated fatty acid,polyunsaturated fatty acid and isoprenoid acid. In these five samples,the short chain saturated fatty acid mainly came from bacteria and planktons,while the long chain saturated fatty acid was from the terrigenous higher plants. Their ratio indicates that the input of marine bacteria and planktons is far more than that of the terrigenous higher plant in the studied area. The branched fatty acid 10me16:0 and monounsaturated fatty acid 18:1ω9、16:1ω9 are mainly synthesized by the sulfate reducing bacteria,while 16:1ω7 is from the sulfur oxidizing bacteria. Comparison of the relative content of them,the author believes that the surface sediments of the Shenhu area may be embraced by reducing environment. In addition,eight isoprenoid acids detected in the samples,mainly phytanic acid and 17β(H),21β(H)-32-hopanoic acid,and a small amount of the pristane acid,presumably for the joint contribution of chlorophyll A and bacterial microorganisms.
- fatty acid,
- sulfate reducing bacteria,
- sulfur oxidizing bacteria,
- Shenhu Area

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