柴达木盆地侏罗系分布的主控因素研究  

The main control factor for Jurassic distribution in Qaidam Basin

作　　者：陈志勇[1] 肖安成[2] 周苏平 何光玉[2] 

机构地区：[1]中国地质大学(武汉)研究生院,湖北武汉430000 [2]浙江大学地球科学系,浙江杭州310027 [3]中国石油青海油田分公司,甘肃敦煌736202

出　　处：《地学前缘》2005年第3期149-155,共7页Earth Science Frontiers

基　　金："十五"国家重点科技攻关项目(2004BA616A-04-01);中国石油青海油田公司资助项目(02-107401-7)

摘　　要：探讨了柴达木盆地现今上、中和下侏罗统的残余分布及控制因素,指出侏罗纪为连续的沉积过程,下侏罗统的断陷盆地原始沉积中心集中在阿尔金、红山和冷湖构造带以南的地区;中侏罗世为坳陷型盆地,沉积面积大于早侏罗世;晚侏罗世和早白垩世为范围广阔的大型坳陷盆地。晚白垩世大面积隆升,侏罗系剥蚀量最大的地区位于冷湖一带。新生代晚期的走滑冲断作用对于侏罗系的分布有着决定性的影响,赛什腾山和北部的南祁连山隆升使侏罗系被分割成南北两个残余分布区。We discuss in this paper controls on the current distribution of Jurassic strata in Qaidam Basin. Jurassic sedimentation was uninterrupted. The depocenter of the Lower Jurassic fault basin lies south of the Altun Fault and the Hongshan and Lenghu structural belts. A down-warped basin formed in the Middle Jurassic, and the area of sedimentation was larger than that of the Early Jurassic. A larger down-warped basin formed during the Late Jurassic and the Early Cretaceous. The basin was uplifted and denuded in the Late Cretaceous, and most of the denudation region was in the Lenghu area. The current distribution of Jurassic strata was influenced critically by strike-slip faulting and thrusting in the Late Cenozoic. Uplift of the Saishiteng and Southern Qilian Mountains divided the Jurassic sequences into southern and northern geographic remnants.

关 键 词：柴达木盆地 侏罗系 沉积物分布 

分 类 号：P534.52[天文地球—古生物学与地层学]