措勤盆地下白垩统郎山组生物礁的平面分布特征及意义探讨  

The planar distribution and significance of the organic reefs in the Lower Cretaceous Nangshan Formation in the Coqen Basin, Xizang

作　　者：陈明[1] 王剑[1] 谭富文[1] 杜佰伟[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059

出　　处：《沉积与特提斯地质》2003年第4期68-70,共3页Sedimentary Geology and Tethyan Geology

基　　金：国土资源部"十五"重大基础研究项目"青藏高原重点沉积盆地演化与油气远景分析"(20010208)。

摘　　要：措勤盆地生物礁的分布有一定规律性,现今发现的8个生物礁剖面均分布于且坎 古昌 罗波 当穹错断裂两侧。结合该断裂带出现的放射虫硅质岩沉积和火山岩堆积,推测该断裂带不仅为控相断裂,而且曾经有深水沉积,由于后期的再次活动而消失于断裂带内部。断裂带两侧的生物礁应为台地边缘礁。The Coqen Basin is located in the hinterland of the Qinghai-Xizang Plateau. Eight organic reef sections have been identified in the basin along the Qiekan-Guchang-Luobo-Dangqiongco fault zone. It is inferred, from the radiolarian siliceous rocks and volcanic rocks, that the fault zone should be a facies-controlling fault zone, where the deep-water deposits including platform-margin slope and basin deposits were once (accumulated). Afterwards these deep-water deposits disappeared within the fault zone due to subsequent reactivation of faulting. The organic reefs along the both sides of the fault zone should be assigned to the platform-margin reefs.

关 键 词：下白垩统 生物礁 控相断裂 措勤盆地 西藏 

分 类 号：P534.53[天文地球—古生物学与地层学] Q178.535[天文地球—地质学]