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The carbonate cycles in the northern South China Sea during the last 30 ka and the paleoclimatic significance

GE Qian1,2,MENG Xian-wei3,CHU Feng-you2,FANG Yin-xia2,YANG Ke-hong2,LEI Ji-jiang2,LI Xiao-hu2,ZHAO Jian-ru2(1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China;2.Second Institute of Oceanography,SOA,Laboratory of Submarine Geosciences,SOA,Hangzhou 310012,China;3.First Institute of Oceanography,SOA, Qingdao 266061,China)  
Core ZHS-176,which lies above the lysocline,contains the paleoceanographic records from the northern South China Sea(SCS) during the last 30 ka.An approach based on the carbonate content has been used to identify the feature of carbonate cycles in the northern SCS.The carbonate content is high during the interglacial periods and low during the glacial periods,and the carbonate cycles could be divided into 5 stages:(Ⅰ) last glaciation,CaCO3 content is low;(Ⅱ) deglaciation,CaCO3 content increases markedly,and appears the first peak value;(Ⅲ) early post-glacial period,CaCO3 content decreases obviously,and appears the low value;(Ⅳ) middle post-glacial period,CaCO3 content increases again,and shows the second peak;(Ⅴ) late post-glacial period,CaCO3 content decreases appreciably.Although the variations of carbonate content in Core ZHS-176 show that the feature of carbonate cycles in northern SCS is typical Atlantic type as a whole,there is a low carbonate event at about 8.5~7.5 ka B P,which may result from the high terrigenous dilution and strong carbonate dissolution.
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