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《Earth Science(Journal of China University of Geosciences)》 2010-04
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Carbon Isotope Evidence of Gas Hydrate Dissociation in South China Sea

WANG Shu-hong1,2,YAN Wen1,2,CHEN Zhong1,2,CHEN Mu-hong1,SONG Hai-bin2,3 1.CAS Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China 2.Guangzhou Center for Gas Hydrate Research,Chinese Academy of Sciences,Guangzhou 510640,China 3.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China  
High-resolution carbon and oxygen isotope analysis for cores NS93-5and NS97-37from southern South China Sea(SCS)shows the rapid negative excursion of carbon isotope in the last deglaciation(about 18ka)and the penultimate deglaciation(about 130ka).In the same layer,the oxygen isotope also displays similar phenomena.It is found that the Globigerinoides rubber(Pink)died out in midpoint of MIS 5/6(about 129.84ka).The change of carbon and oxygen isotope is in consonance with atmospheric methane concentration from the Vostok ice core.The two rapid negative excursions of carbon isotope recorded in SCS are likely related to gas hydrate dissociation,i.e.the changes of temperature and pressure induced gas hydrate dissociation and released methane in SCS and/or other areas,which made the climate warmer,ocean anoxic and further led to the extinction of some marine organism and accelerated glacial termination.
【Fund】: 国家自然科学基金(Nos.40676043 40706022) 国家自然科学基金-广东联合基金(No.U0733003);; 中国科学院边缘海地质重点实验室基金(No.MSGL0703) 中国科学院南海海洋研究所青年人才领域前沿项目 中国科学院知识创新工程重要方向项目(No.KZCX2-YW-211)
【CateGory Index】: P618.13
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