柴达木盆地北缘地区新生代构造特征及变形规律  

CENOZOIC STRUCTURAL FEATURES AND DEFORMATION REGULARITIES OF THE NORTHERN QAIDAM BASIN, CHINA

作　　者：刘志宏[1] 万传彪[2] 杨建国[2] 刘振文[2] 高军义[2] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地质科学》2005年第3期404-414,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：大庆油田有限责任公司勘探开发研究院项目"柴北缘新生代构造地震地层解释"资助;国家自然科学基金重点项目(批准号:49832040)资助。

摘　　要：柴达木盆地北缘地区的新生代构造主要为一系列断层转折褶皱、断层传播褶皱。在邻近祁连山山前的北东背斜带中主要发育规模相对较小、隆升幅度较低的断层传播褶皱和与之相伴产出的突破断层,开始形成于古新世上新世早期;中部背斜带中发育的构造主要为断层转折褶皱和少量断层传播褶皱,开始形成于中新世上新世中期;远离山前的南西背斜带主要发育断层转折褶皱和少量滑脱褶皱,开始于上新世晚期更新世。研究区的台阶状逆断层及其相关褶皱是由祁连山山前向盆地按照一定的序次、以背驮式渐次扩展的,这个扩展过程自古新世一直持续到现在。The Cenozoic structures in northern marginal area of the Qaidam Basin consisted mainly of a series of fault-band folds and fault-propagation folds, where could be separated into three belts. The Northeastern Anticline Zone, along the foothill of the Qilian Mountains, consisted of small scale and relatively gentle fault-propagation folds and break-through faults, which started to form during Paleocene to the early stage of Pliocene. The Central Anticline Zone composed of fault-band folds and a few fault-propagation folds, which started to form during Miocene to the middle stage of Pliocene. The Southeastern Anticline Zone, far away from the foothill of the Qilian Mountains, created during the late stage of Pliocene to Pleistocene. The flat-ramp faulting and fault-related folding in northern margin of the Qaidamu Basin migrated from foothill of the Qilian Mountains to the basin in sequence of piggyback, and they were formed from Paleocene to now.

关 键 词：构造特征 变形规律 柴达木盆地 新生代 

分 类 号：P542[天文地球—构造地质学]