¹⁰Be Distribution and Uranium-series Dating of Salt Samples from Salt Playae in the Chaidamu Basin,Qinghai,Northwest China

【摘要】 <正> The distributions of cosmogenic nuclide ¹⁰Be in the upper and lower salt units from a core（36.4°N,94.5°E） in the Chaidamu Basin,Qinghai,China have been measured by means of accelerator-mass spec-trometer.The comparison of these ¹⁰Be resuhs measured on salt and detritus fractions shows that thegeochemical behaviour of ¹⁰Be is detritus-phile,In this area ¹⁰Be influx is different in the past tens ofthousands of years,which is suggested to be related to climatic fluctuations during late Pleistocene.It seemsthat ¹⁰Be influx is higher in the humid climate environment than in the dry climate environment.The²³⁰Th-age estimates of two salt units have been determined.The corrected ages of the lower unit show aclimate shift from humid to dry at about 50 Ka ago in this area.更多还原

【Abstract】 The distributions of cosmogenic nuclide ¹⁰Be in the upper and lower salt units from a core（36.4°N, 94.5°E） in the Chaidamu Basin,Qinghai,China have been measured by means of accelerator-mass spec- trometer.The comparison of these ¹⁰Be resuhs measured on salt and detritus fractions shows that the geochemical behaviour of ¹⁰Be is detritus-phile,In this area ¹⁰Be influx is different in the past tens of thousands of years,which is suggested to be related to climatic fluctuations during late Pleistocene.It seems that ¹⁰Be influx is higher in the humid climate environment than in the dry climate environment.The ²³⁰Th-age estimates of two salt units have been determined.The corrected ages of the lower unit show a climate shift from humid to dry at about 50 Ka ago in this area.更多还原