塔里木盆地阿瓦提凹陷周缘的晚新生代张扭性断层带  

The Late Cenozoic tensor-shear fault zones around Awati Sag,NW Tarim Basin

作　　者：李曰俊[1] 孙龙德[2] 杨海军[3] 张光亚[4] 齐英敏[3] 桑洪[3] 王月然[3] 刘亚雷[1] 张强[1] 文磊[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油天然气股份有限公司,北京100007 [3]中国石油塔里木油田分公司,新疆库尔勒841000 [4]中国石油勘探开发研究院,北京100083

出　　处：《地质科学》2013年第1期109-123,共15页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项课题"全球重点大区石油地质特征与油气分布规律"(编号:2011ZX05028-003);塔里木油田资助

摘　　要：塔里木盆地西北部的阿瓦提凹陷周缘发育晚新生代正断层,其中第四纪的正断层活动是塔里木盆地构造地质研究的新发现。这些正断层受先存基底断裂控制,平面上沿沙井子断裂带、阿恰断裂带和吐木休克断裂带右阶式雁列状分布,构成右阶左旋张扭性正断层带。剖面上,向下断达下古生界后不清楚,向上断至第四系上部,构成阶梯状或小型地堑(或负花状构造)构造。生长系数计算结果表明,正断层带形成于新近纪末,第四纪早-中期持续活动,到第四纪晚期停止活动。这些张扭性正断层带的成因是阿瓦提地块相对于周边地质体的顺时针旋转而致,其动力学来源于印度板块与欧亚板块陆一陆碰撞,在晚喜马拉雅山期依然持续作用而导致的远程效应。Late Cenozoic normal faults are developed around Awati Sag,NW Tarim Basin. In which, the Quaternary normal fault activities is the first discovery of structural study in Tarim Basin. The normal faults are controlled with the pre-existed basement faults. Horizontally, they are arranged in right-step en echelon along Shajingzi, Aqia and Tumuxiuke Fault zones, constitute sinistral tenso-shear fault zones. In profile,the normal fault zones cut thxough Upper Paleozoic to Middle Quaternary, forming small horst-graben structures or step cross sections. They not clear in Lower Paleozoic. On the basis of careful seismic interpretation and the growth-indices of the normal faults, the tenso-shear normal fault zones were formed at the end of Neogene, activing in Early-Middle Quaternary and ceased in Late Quaternary. The genesis of the tenso- shear fault zones is the clockwise rotation of Awati block related to its surrounding geologic bodies.

关 键 词：塔里木盆地西北部 阿瓦提凹陷 上新世晚期-第四纪中期 正断层 张扭性断层带 顺时针旋转 

分 类 号：P542[天文地球—构造地质学]