Late Oligocene–Early Miocene Thrusting in Southern East Kunlun Mountains, Northern Tibetan Plateau

作     者：吴珍汉 叶培盛 Barosh J Patrick 胡道功 赵文津 吴中海 

作者机构：Institute of GeomechanicsChinese Academy of Geological Sciences P. J. Barosh and Associate103 Aaron AvenueBristolRI 02809USA Chinese Academy of Geological Sciences 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2009年第20卷第2期

页      面：381-390页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the Ministry of Science and Technology of China (No. 2006DFB21330) China Geological Survey (Nos. 1212010711510 and 1212010511809) 

主　　题：South Kunlun thrust (SKT) thrusting and folding chronological constrain northern Tibetan plateau. 

摘      要：Southward thrusting occurred in Late Oligocene-Early Miocene in southern East Kunlun （昆仑） Mountains formed the South Kunlun thrust （SKT）. Permian strata and Triassic rocks were thrusted over the Paleocene-Eocene red-beds of Fenghuoshan （风火山） Group and Oligocene brownish red conglomerate and sandstone of Yaxicuo （雅西错） Group along SKT faults, formed tectonic slices, low-angle thrust faults, multi-scaled outliers, and nappe structures in south of Middle Kunlun fault （MKF）. In addition, SKT displacement or shortening is estimated to be -（30-35） km across Dongdatan （东大滩） valley and East Wenquan （温泉） basin. 39Ar-40Ar dating of chlorite of ductile shear zone along front thrust fault indicates that SKT thrusting occurred at 26.5±2.7 Ma, and fission track dating of apatite from mylonitic granite in SKT gives the age 26±2 Ma, corresponding to initial time of rapid uplift of East Kunlun Mountains. Thrust faults and folds of SKT were covered unconformably by Late Miocene lacustrine strata, and major thrusting of SKT ended before 13.5-14.5 Ma according to regional chronological data in northern Tibetan plateau.