临夏盆地毛沟剖面2) Linxia Basin 临夏盆地 1. Fission track dating of Cenozoic strata in Linxia Basin; 临夏盆地新生代地层裂变径迹年龄测定 2. Grain-size records of Cenozoic Lacustrine sediments from Linxia Basin and the aridification