In-situ cosmogenic ^(36)Cl denudation rates of carbonates in Guizhou karst area

查看全文 作　　者：XU [1,2]Sheng;LIU [1]CongQiang;FREEMAN [2]Stewart;LANG [1]YunChao;SCHNABEL [2]Christoph;TU [1]ChengLong;WILCKEN [2]Klaus;ZHAO [1]ZhiQi

机构地区：[1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences;[2]Scottish Universities Environmental Research Center

出　　处：《Chinese Science Bulletin》索引2013年第58卷第20期,共7页

基　　金：supported by the National Natural Science Foundation of China (41130536 and 41021062);the State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences (9014) 摘　　要：This study quantifies surface denudation of carbonate rocks by the first application of in-situ cosmogenic36Cl in China. Concentrations of natural Cl and in-situ cosmogenic36Cl in bare carbonates from Guizhou karst areas were measured with isotope dilution by accelerator mass spectrometer. The Cl concentration varied from 16 to 206 ppm. The 36Cl concentrations were in range of (0.8-2.4)106 atom g-1 , resulting in total denudation rates of 20-50 mm ka-1 that averaged over a 104-105 a timescale. The 36Cl-denudation rates showed roughly a negative correlation with the local mean temperature. This preliminary observation may suggest the variations of proportions of chemical weathering and physical erosion in denudation process, depending upon local climatic conditions. 关键词：喀斯特地区剥蚀速率宇宙成因碳酸盐岩原位贵州加速器质谱仪稀释浓度

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In-situ cosmogenic ^(36)Cl denudation rates of carbonates in Guizhou karst area

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