大柴旦盐湖卤水演变及环境变化的矿物学记录.PDF

第 40 卷 第 2 期 Vol.40, No.2, 156~162 2011 年 3 月 GEOCHIMICA Mar., 2011 1, 2 1 1* 1, 2 1, 2 高春亮 , 张丽莎 , 余俊清 , 成艾颖 , 刘 永 (1. , 810008; 2. , 100049) 摘 要: , (AMS) 14C , 3600 a BP ; 3 ; , 关键词: ; ; ; ; 中图分类号: P59; P539.7 文献标识码: A 文章编号: 0379-1726(2011)02-0156-07 A mineralogical record of brine evolution and environmental change from Da Qaidam Salt Lake in the northern Qaidam Basin 1,2 1 1* 1,2 1,2 GAO Chun-liang , ZHANG Li-sa , YU Jun-qing , CHENG Ai-ying and LIU Yong 1. Institute of Salt Lake Studies , Chinese Academy of Sciences, Xinning 810008, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China Abstract: Da Qaidam Salt Lake is known for its both liquid and solid boron resource. The exploitation of the boron deposits and related geological studies started since 1950s. Little attention has been paid, however, to the study of sedimentary records from the salt lake as regarding to brine evolution and environmental change. Here we report the result of AMS 14C dating and mineralogical investigation on a subbottom sediment section from the central area of the saline water-body. The result reveals that the subbottom pinnoite deposit was formed before 3600 a BP, and that the lake underwent three stages of lake–levels and br