塔里木盆地晚志留世-石炭纪伸展构造的发现及其地质意义  

New discovery of Late Silurian-Carboniferous extensional structure in Tarim Basin and its geological significance

作　　者：李日俊[1] 孙龙德[2] 杨海军[3] 张光亚[4] 曾昌民[3] 冯晓军[3] 文磊[1] 张强[1] 贾铁干 

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》2014年第1期30-48,共19页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项“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：通过精细的地震资料解释,在塔里木盆地中部的满西地区发现晚志留世一石炭纪伸展构造。伸展构造由一系列规模不大的正断层组成,平面上组成两条北东—南西向的左行雁列状正断层带;剖面上构成负花状构造和堑垒构造。根据生长系数计算结果,正断层形成于晚志留世,在泥盆纪和石炭纪持续活动,于石炭纪末停止活动。正断层活动的高峰期为晚志留世。该期伸展构造在塔中和塔北地区也有发育,反映当时塔里木盆地处于区域性伸展构造背景。塔里木盆地晚志留世—石炭纪的伸展构造,是昆仑早古生代晚期(晚奥陶世—中志留世)碰撞造山后构造应力松弛作用的产物。After careful seismic interpretation, Late Silurian-Carboniferous extensional structures were revealed in western Manjiaer Sag, central Tarim Basin. These extensional structures comprise many small normal faults which usually group sinistral en echelon and form 2 tenso-shear normal fault zones. Combinations of the normal faults in profile become negative flower structures and small horst-graben structures. On the basis of growth index calculation, the normal fault formed in Late Silurian, continue active in Devonian and Carboniferous, ceased at the end of Carboniferous. The peak-stage of normal fault activity is Late Silurian. Late Silurian- Carboniferous normal fault also developed in Tazhong and Tabei areas, implying that Tarim Basin was under regional extensional tectonic setting in Late Silurian-Carboniferous. The extensional structure is the result of post-orogeny stress relaxation of Kunlun Caledonian orogenic belt.

关 键 词：塔里木盆地地震解释 晚志留世-石炭纪正断层 左行张扭性断层带 负花状构造 堑垒构造 生长系数 昆仑加里东碰撞造山作用 造山后应力松弛 

分 类 号：P542[天文地球—构造地质学]