青海大通宝库河断裂活动性研究

RESEARCH ON THE ACTIVITY OF BAOKU RIVER FAULT, DATONG COUNTY,QINGHAI PROVINCE

摘要:

本文在对宝库河地区第四系及地貌单元划分对比的基础上,结合年代测试结果,分析了宝库河断裂带的断错微地貌特征。结果表明,宝库河断裂穿过的Ⅰ-Ⅲ级冲积、坡洪积阶地未被断错;经热释光年代测定,至少在距今6.6±0.8万年以来该断裂未再活动过,是一条晚更新世早期断裂,属左旋走滑型兼具挤压逆冲特性。

Abstract:

In this paper,on the basis of division and comparison of the Quaternary system and geo-morphic units in Baoku river area and according to the ages of specimens,authors analysed the characters of dislocated micro-geomorphology. The results show that Baoku River fault does not cut the first-order to third-order alluvial or pluvial terraces crossed by the fault.Through the thermoluminescent dating, authors found that the Baoku river fault has not revived since 66±8 ka. B,P. The Baoku river fault is a left-lateral and compressional reverse fault,and belongs to late Pleistocene fault.