Pull-apart Basins and the Total Lateral Displacement Along the Haiyuan Fault Zone in Cenozoic  

作　　者：Tian Qinjian, Ding Guoyu, and Shen XuhuiCenter for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China 

出　　处：《Earthquake Research in China》2001年第4期390-398,共9页中国地震研究（英文版）

基　　金：theNationalScienceFoundation (47932 0 95 )andtheNationalEmphasesProgrammingonBasicScience"PredictionandMechanicofStrongEarthquakesinContinent" (95 130 10 2 ) ,China

摘　　要：Pull-apart basins of three scales were found along the Haiyuan fault zone. The largest one is more than 50km long, named Laolongwan basin developed in Miocene. A model was built to calculate the amount of pull-apart of an extensional basin. Parameters used in calculation include thickness and length of deposition and depth of detachment. The results of calculation show that the amount of pull-apart of the Laolongwan Basin is about 30 km. Based on previous studies and calculating by using the average slip rate method, amount of pull-apart of the other two smaller basins are 22 km and 8 km, respectively. Thus, the total displacement of strike-slip along the Haiyuan fault zone is about 60 km, which is close to the offset of the Yellow River from Jingtai to Jingyuan.Pull-apart basins of three scales were found along the Haiyuan fault zone. The largest one is more than 50km long, named Laolongwan basin developed in Miocene. A model was built to calculate the amount of pull-apart of an extensional basin. Parameters used in calculation include thickness and length of deposition and depth of detachment. The results of calculation show that the amount of pull-apart of the Laolongwan Basin is about 30 km. Based on previous studies and calculating by using the average slip rate method, amount of pull-apart of the other two smaller basins are 22 km and 8 km, respectively. Thus, the total displacement of strike-slip along the Haiyuan fault zone is about 60 km, which is close to the offset of the Yellow River from Jingtai to Jingyuan.

关 键 词：LATERAL DISPLACEMENT PULL-APART basin HAIYUAN fault zone 

分 类 号：P315[天文地球—地震学]