Apatite fission track dating evidence on the tectonization of Gangdese block, south Qinghai-Tibetan Plateau

查看全文 作　　者：YUAN [1]Wanming;WANG [1]Shicheng;LI [2]Shengrong;YANG [3]Zhiqiang 机构地区：[1]Institute of High Energy Physics,Chinese Acadeny of Sciences,Beijing 100039,China;[2]China University of Geosciences,Beijing 100083,China;[3]Exploration and Production Research Institute,SINOPEC,Beijing100083,China 出　　处：《Chinese Science Bulletin》索引2002年第47卷第3期,共5页 基　　金：This work was supported by the President Fund of the Chinese Academy of Sciences (CAS) (Grant No. 99-775); the National Natural Science Foundation of China (Grant No. 40072068) ; Laboratory of Nuclear Analysis Technique, the CAS. 摘　　要：This work makes the quantitative constrain on tectonizations of the Gangdese block, south Qinghai-Tibetan Plateau. Apatite fission track (AFT) dating analyses of 15 samples collected across the Gangdese block show that the Gangdese block went through two periods of tectonizations, during -37.2-18.5 Ma and 18.5 - 8.0 Ma in the south Gangdese block, and during -47.6-5.3 Ma and 5.3-0 Ma in the middle Gangdese block. Different upliftings did not take place in the first period and rapid uplifting occurred in the late period. Meantime, there are some differences be-tween the south and middle Gangdese block. Their uplifting rate is 180 m/Ma and 70 m/Ma respectively. The rapid up-lifting time in the middle Gangdese block lagged behind the time in the south Gangdese block. It is Chala-Jiacuo-Riduo fault zone that is similar to the Yarlung Zangbo fault zone in control of the tectonization. 关 键 词：tectonization fault zone FISSION track APATITE UPLIFTING and cooling GANGDESE block.