吐鲁番-哈密盆地是我国西部极端干旱区。吐哈地区的干旱化是何时开始的，其时空演化特征又是什么？这对于揭示亚洲内陆干旱化的动力学机制提供重要数据。在前期研究初步建立了风化矿物40Ar/39Ar测试的实验流程,在此基础上，本申请拟以该吐哈盆地为研究目标区，以吐哈地区西部、中部和东部三个矿区的矿床氧化带中黄钾铁矾(明矾石等)为主要测试对象，通过应用40Ar/39Ar定年和H-O稳定同位素（δD和δ18O）分析的联合测试对这些矿物进行详细研究，优化或简化实验流程，获得新生代以来一大批高精度的同位素年龄和H-O稳定同位素数据，查明硫化物矿床大陆化学风化历史和表生矿物富集的时间、速率、周期及期次，揭示吐哈盆地新生代长时间连续完整的干旱化历史、时空上的演化趋势，并探讨青藏高原隆升、全球气候变化、特提斯海的消退等因素在影响该地区干旱化过程中所起的作用。

The Tulufan-Hami Basin is an extreme arid region of northwestern China. The beginning and the evolutionary space-time characteristics of aridification of the Tu-Ha Basin are the important parameters to constrain the dynamics of inland aridification in Asian. In our previous study, the dating experiment procedures had been preliminary established. On this basis, we plan to use 40Ar/39Ar incremental heating method and corresponding stable oxygen and hydrogen isotopes analysis (δD and δ18O) to date and analyze supergene jarosite (alunite etc.) in the oxidation zone of sulfide deposits in the western, central and eastern mining areas of the Tu-Ha Basin, to optimize or simplify the experimental procedures and to determine continental chemical weathering history and the time, rate, cycle and period of the supergene mineral enrichment. According to the results, we analyze the origin and evolution of the dry climate and get a long-term continuous and complete aridification history and the of the Tu-Ha Basin during Cenozoic, and then discuss the role played by the Tibetan uplift, global cooling and the retreat of the Paratethys Sea on the drying of Tu-Ha Basin.