The lacustrine sediments of the Nam Co Basin in Tibet from 116 ka and related environmental evolution and climate changes
The lacustrine sediments of the Nam Co Basin in Tibet from 116 ka and related environmental evolution and climate changes
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西藏纳木错盆地116ka以来的湖泊沉积及相关环境演化和气候变化
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Meng Qing
中科院分区：
文献类型：
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作者：
Q. Jun;Zhu Da;Meng Xiangang;Shao Zhaogang;Han Jian;Meng Qing
水位仪测量结果表明，纳木错湖岸发育48 ~ 139.2 m的湖相沉积，并形成6级湖泊梯田，梯田高度低于湖平面48 m。根据湖相和湖滨沉积的地质剖面测量、地层层序和岩性、同位素定年，将湖相沉积地层划分为一群和两组。盐沉积物的研究,pH值、地球化学、粘土矿物、介形亚纲和孢粉分析表明,湖岸存款记录的信息环境演化和气候变化从116 ka B.P.The达达表明从116 ka B.P.The最好的温暖和潮湿的气候发生在全新世,但从90.1到86.5 ka B.P.The气候相对温暖,温度等于或略高于现在,属于温暖潮湿的或稍干燥的气候;36.0 ~ 35.0 ka b.p.，气温、湿度比现在略高或略高。研究结果表明，自晚更新世以来，环境经历了多次冷暖变化和干（湿）变化，总变化趋势是由冷逐渐变暖。
The results of the measurement by the water-level instrument show that there are the lacustrine deposits from 48 to 139.2 meters and the six grade lake terraces whose heights are less than 48 meters above the lake-level along the coasts of the Nam Co Lake.According to the measurement of geological sections,strata sequence and lithology,isotopic dating of the lacustrine and lakeshore deposits,the strata of the lacustrine deposits has been divided into one group and two formations.The studies of the salt sediments,pH value,geochemistry,clay minerals,ostracoda and sporopollen analysis show that the lakeshore deposits recorded the information of the environmental evolution and climate changes from 116 ka B.P.The dada shows that from 116 ka B.P.the best warm and humid climate occurred in Holocene,but from 90.1 to 86.5 ka B.P.the climate is relative warmer,temperature was equal or slightly higher than that of the present,belongs to warm and humid or slightly dry climate;from 36.0 to 35.0 ka B.P.air temperature and humidity is slightly high or higher than that of the present.The study results show that the environment have experienced many times of cold-warm changes and dry-(humid) changes within the total changing trend from cold to warm gradually since the Late Pleistocene.