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CONTENT OF CaCO_3 IN THE LOESS OF SHENGSI ISLANDS

XU Jian~1,ZHENG Xiang-min ~1,CAO Xi-qiang~2(1 Key Lab of Geo-information Science,Education Ministry,East China Normal University, Shanghai 200062,China;2 He'nan Scientific Institute of Land and Resources,Zhengzhou 450053,China)  
We analyzed the content of CaCO_(3) in the loess of Shengshan Island and Langgangshan Islands,and found the content is only about 0.1%,which is far below that in other loess sections.That should be caused by high precipitation,thin thickness of the section and lots of volcanic eruptions around.The CaCO_(3) in the loess of Shengshan Island and Langgangshan Islands belongs to deuterogenic residual CaCO_(3),and cannot be used to reflect paleoclimate.We contrast the content of CaCO_(3) in the loess of Shengshan Island and Langgangshan Islands with other loess sections,and find the content of CaCO_(3) in the loess is decreased equably,which should be the result of different velocity of eluviate and illuviate caused by precipitation changes.
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