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《Journal of Jilin University(Earth Science Edition)》 2012-S1
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Respondence Between Carbon and Oxygen Isotopic Characteristics of Foraminifera from the Northern South China Sea and Late Quaternary Hydrate Released

Cao Chao,Lei Huai-yan College of Oceanography and Environmental Science / State Key Laboratory of Marine Environment Science Xiamen University, Xiamen 361005,Fujian,China  
To search the records of the gas hydrate decomposition events under methane seepage condition since the late Quaternary,carbon and oxygen isotopes analysis and radiometric dating of foraminifera from sediment cores collected from three different blocks of the northern slope of the South China Sea are carried out.The results show:1) the carbon isotope value of benthic foraminifera Uvigerina spp.is-2.12 ‰ to-0.21 ‰ and oxygen isotope value of planktonic foraminifera Globigerinoides ruber is-3.11 ‰ to-0.60 ‰;2) the age of the two cores at the bottom of ZD3 and ZS5 drills are 26 616 a and 64 090 a respectively,corresponding to the early oxygen isotope stage Ⅲ and the end of Ⅳ;3) negative-skewed layer of carbon isotope(up to-2 ‰) corresponds to that of oxygen isotope stage Ⅱ(cold period);4) the foraminifera oxygen isotopic compositions are similar to those from the Late Quaternary sediments of Blake Ridge and the Gulf of Mexico.According to our analysis,the reasons include :1) the study area is under a typical methane seep environment in the area at oxygen isotope stageⅡ;2) due to global sea-level fall,water pressure at the sea floor decreases,gas hydrate decomposed and released;3) large amount of light carbon isotopes of methane were released into the sea inorganic carbon(DIC) pool and were recorded in the foraminifera shell.Pyrite layers developed in the negative bias layers of foraminifera further supports our views that the carbon isotope of the foraminifera were affected by methane more intensely than by the reduction of marine productivity and by early diagenesis.
【Fund】: 国家“973”计划项目(2009CB219501);; 国家自然科学基金项目(40976035)
【CateGory Index】: P597
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