Age dating of lacustrine sedi - ments in Lake Tianshuihai of the Tibetan Plateau by using U-series isochron method and Its significance

摘要

The age of the clastic - clay sediments with var - ied content of carbonate in core TS95 taken from the Lake Tianshuihai in the northwest of the Tibetan Plateau was de - Termined successfully by using the total sample dissolution U-series isochron method for the first time. With this method, The serial absolute timescale (isotope time scale) covered the Last 240 ka in the main body of the Tibetan Plateau with a Sea level up to 4000 m is also established for the first time, Thereby laying the foundation for the research on the paleo - Climate and palaeoenvironment in the Lake Tianshuihai re - Gion as well as the relationship between evolution ofo the Ti - Betan Plateau and global changes.