【摘要】 用高灵敏度加速器质谱计测量柴达木盆地干盐湖一个钻孔岩心（36.4°N,94.5°E）上下两个盐层的盐相和碎屑相的宇宙成因核¹⁰Be的分布,结果表明¹⁰Be的地化特征是亲碎屑相的。在近几万年以来,¹⁰Be的沉降速率是不均匀的,似乎与气候有关,湿润期的沉降速率大于干旱期的沉降速率。用²³⁰Th法测定了两个盐层的年代。校正后下部盐层的年龄说明该地区气候由湿润变为干旱期约发生在距今45ka。这和深海岩心2阶段和3阶段交界的²³⁰Th年龄（36.3±1.8ka）基本吻合。更多还原

【Abstract】 The distributions of cosmogenic nuclide 10Be in the upper and lower salt anils from a core (36.4°N,94.5°E) in the Chaidamu basin,Qinghai,China have been measured using the accelerator mass spectrometer.The comparison of these 10Be results measured on saline and detritus phases shows that the Geochemical behaviour of 10Be is detritusphile.In this area 10Be deposition rates are 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 deposition rates were higher in wet environments than in dry environments.The 230Th-based age estimates of two salt units have been determined.The corrected age results of the lower unit show a climate shift from wet into dry at about 45 ka ago in this area.This is in agreement with the 230Th age (36.3±18ka) of the deep sea core sample at the boundaiv between Stage 2 and Stage 3更多还原