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

基金项目:

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)。

详细信息

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

1. Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China

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。
- 下白垩统 /
- 生物礁 /
- 控相断裂 /
- 措勤 /
- 西藏
Abstract: 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.
- Lower Cretaceous /
- organic reefs /
- facies-controlling fault /
- Coqen /
- Xizang