新疆博格达地区中—新生代碎屑成分特征与盆山分异过程  

The Mesozoic-Cenozoic Clastic Composition of Bogda Area, Xinjiang: Implications on the Evolution of Basin-Range Pattern

作　　者：方世虎[1] 宋岩[1] 贾承造[1] 王绪龙[2] 袁庆东[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]新疆油田公司,克拉玛依834000

出　　处：《地质学报》2007年第9期1229-1237,共9页Acta Geologica Sinica

基　　金：中国石油集团中青年石油科技创新基金(编号05E7036;07E1028);中国博士后科学基金(编号2005037101);中国石油重点科技攻关资助项目(编号0601A-02-01)资助的成果

摘　　要：新疆博格达地区中—新生界碎屑成分自中侏罗世的中晚期开始发生了巨大变化,主要表现在:自中侏罗世晚期开始,沉积重矿物组合及相对含量发生较大变化,不稳定重矿物、较高级别变质岩岩屑明显增多,显示此时发生的物源属性变化及构造活动的存在;自侏罗系西山窑组沉积晚期开始,砂岩碎屑成分中的沉积岩碎屑明显增加,显示盆缘沉积岩物源的隆升和剥蚀作用。结合前人研究成果,笔者认为,博格达地区的盆山分异过程主要对应于中晚侏罗世-早白垩世早期、晚白垩世和新近纪以来,其中中侏罗世的中晚期是博格达地区开始发生盆山分异的初始时期。It is an important method to understand provenance types, basin-range evolution and tectonic attributes of Bogda area through detrital composition of sandstones. The Mesozoic-Cenozoic detrital compositions utterly differ from the upper Mid-Jurassic ones, which suggests an intense change of basin-range pattern initiated. Increase of that clast of sedimentary rock, high-grade metamorphic rock and unstable heavy minerals shows tectonically active setting and obvious uplift of Bogda Mountain during the Late Jurassic to early Early Cretaceous, Late Cretaceous and Late Cenozoic, led to the widely different sedimentary succession and rapid evolution of basin-range pattern around the Bogda area. In terms of the three tectonic events, that of Middle-Late Jurassic to Early Cretaceous is the initial period for differential evolution of basin-range pattern, and the provenance system changed intensely, following by episodic rapid uplifting of Bogda Mountain during the Late Jurassic to early Early Cretaceous, Late Cretaceous and Late Cenozoic.

关 键 词：博格达地区 中—新生代 碎屑成分 构造活动 盆山格局 

分 类 号：P512.2[天文地球—地质学]