Fission track age of granite batholith from Southern Tibet:implications for the plateau uplift

查看全文 作　　者：[1]ZHAOZhidan;[1]MOXuanxue;[1]GUOTieying;[1]ZHANGShuangquan;[1]ZHOUSu;[1]DONGGuochen;[1]WANGLiangliang;[1]ZHANGFengqin;[2]WANJinglin 机构地区：[1]ChinaUniversityofGeosciences,Beijing100083,China;[2]InstituteofGeology,ChinaSeismologicalBuresu,Beijing100029,China 出　　处：《Progress in Natural Science:Materials International》索引2003年第13卷第8期,共5页 基　　金：Supported by the National Natural Science Foundation of China (Grant Nos.40103003,49802005),National Key Project for Basic Research on Tibetan Plateau (G1998040800,2002CB412600),Key Basic (9501101-3) and Special Projects on Tibetan Plateau of the Minist 摘　　要：Fission track (FT) ages of apatite and zircon from four granite batholiths from Lhasa and Shannan areas are measured. The FT ages of apatite range from 3.2 to 8.3 Ma, corresponding to the uplift rates of 0.12 to 0.20 mm*a-1 during this period. The uplift height is 580 m, showing that there is not large-scale rapid uplifting in southern Tibet from 3.2 to 8.3 Ma. The zircon FT ages of Lhasa batholith are 25.9±1.7 and 32.7±2.8 Ma, yielding an uplift rate of 0.08 mm*a-1 between 26 and 33 Ma. Combining this work with other studies, it is suggested that the average uplift rate in southern Tibet is low from the time of collision between India and Asian continents to ~3 Ma. The uplift of Tibetan Plateau seems to have finished in multi-stage processes with varied rates. 关 键 词：花岗岩 磷灰石 锆石 裂变径迹年龄 西藏南部 高原隆起