论文部分内容阅读
根据青藏高原那曲地区错鄂CE-1孔~(137)Cs和~(210)Pb测试结果,建立了该孔年代序列.根据沉积物岩性、碳酸盐含量、介形虫壳体Sr/Ca和Mg/Ca比值、碳酸盐同位素分析,推测青藏高原中部近0.2 ka来环境变化经历了两大阶段,即:前0.1 ka,气候干旱,沉积环境为沼泽环境;后0.1 ka,气温上升,湿度增大,为湖泊环境.0.1 ka来的湿度变化存在0.02 ka的周期,其中,1920～1940和1960～1980年前后,为两个较为湿润的时期,1980年以来该地区变干.
Based on the results of ~ (137) Cs and ~ (210) Pb measurements of CE-1 in Ercao in the Naqu area of the Qinghai-Tibet Plateau, the sequence of the pores was established. According to lithology and carbonate content of sediments, Sr / Ca and Mg / Ca ratio and carbonate isotope analysis, it is speculated that the environmental change in the central part of Qinghai-Tibet Plateau has been going through two stages, ie, the first 0.1 ka, the dry climate and the sedimentary environment in a swamp environment; after 0.1 ka, the temperature rises , The humidity increased, and the lacustrine environment. There was a period of 0.02 ka for the change of humidity at 0.1 ka, of which two periods were relatively humid from 1920 to 1940 and 1960 to 1980, and the area became dry after 1980.