On the Unusual Holocene Carbonate Sediment in Lake Nam Co,Central Tibet

查看全文 作　　者：LI [1]Minghui;KANG [1,2]Shichang;ZHU [1]Liping;WANG [3]Feiyue;WANG [1]Junbo;YI [1]Chaolu;FANG [1]Xiaomin;XIE [1]Manping

机构地区：[1]Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, Beijing 100085, China;[2]State Key Laboratory of Cryospheric Science, CAS, Lanzhou 730000, China;[3]Department of Environment and Geography and Department of Chemistry, University of Manitoba, Winnipeg MB R3T 2N2, Canada

出　　处：《Journal of Mountain Science》索引2009年第6卷第4期,共8页

基　　金：supported by the National Basic Research Program of China (2005CB422000);the National Natural Science Foundation of China (40801075, 40830743, 40701194, 40671023, and 40730101) 摘　　要：In lacustrine sediments,aragonite is a widespread mineral,whereas monohydrocalcite is a rare carbonate mineral. In the cold and high-attitude Xizang (Tibetan) Plateau,where aragonite has been commonly found in lacustrine sediments,there is no aragonite,but low-Mg calcite,monohydrocalcite and trace dolomite. The lake receives solutes primarily from surface runoffs and remains fairly constant water chemistry for a long time. The total CaCO3 percentage in sediments could be controlled by evaporation and inflow of detrital materials. The absence of aragonite is unusual when compared to other lacustrine sediments from the Tibetan Plateau. This could be due to low Ca/Mg ratio,low salinity,low Mg and Ca concentration. Monohydrocalcite might precipitate from the lake water mediated by biological activities. Low-Mg calcite originated from minor ostracoda shell and the precipitation of lake water with biological activities. 关键词：湖泊沉积物碳酸盐矿物西藏中部纳木错全新世盐湖西藏高原地表径流

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On the Unusual Holocene Carbonate Sediment in Lake Nam Co,Central Tibet

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