摘要
在晚白垩世—始新世夷平面基础上,由于断裂作用形成了贝加尔裂谷系。断裂作用最大幅度超过10km。在裂谷系中心部位发育的断层长度最大、最深、最早,并以准对称形式向四周扩展。贝加尔裂谷系是在地幔隆起和印度—欧亚大陆碰撞双重作用下形成。贝加尔裂谷系与中国东部新生代断陷盆地和汾渭裂谷系同时形成,并有密切的成因联系。它们的形成不仅受太平洋板块的俯冲和印度—欧亚大陆碰撞的制约和影响,而且位于中国西南部的地幔流发散中心,呈扇状向太平洋区流动,可能是它们在更深层次上的共同场源基础。
The Baikal rift system was formed due to faulting on the late CretaceousEocene. Epoch planation surface base. The maximum range of the faulting goes beyond 10 km. The development of faults in the Baikal rift system is of obvious regularity. Firstly, The scope of faults is the largest in the central part of the rift system, and decreases gradually towards both ends. Secondly, the correlativity of depth and length of faults is very high(0.73). Thirdly, the faulting took place first in the central part of the rift system, and then extended towards all directions in a quasisymmetry pattern. The formation of Baikal rift system was the result of both uplift of the mantle and the effect of collsion of IndiaEurasia, the former being dominant. Therefore, the rift system is of complicated internal texture and unique evolution. The Baikal rift system in Russia and Cenozic faulted basin and FenWei rift system in East China were synchronously formed, and thus having a closely genetic relationship. Their fomation was restricted and influenced by subduction of the Pacific oceanic plate and collision of IndiaEurosia. In addition there is a center of mantle flux in the southwestern part of China. The mantle flux presents a fanshape flow towards the Pacific oceanic region, and is possibly a field source at deep level of the Baikal rift system and East China.
出处
《地球科学进展》
CAS
CSCD
2003年第1期45-49,共5页
Advances in Earth Science
基金
国家自然科学基金国际合作项目"西太平洋中新生代构造带地貌构造特征"(编号:40102010)
国家自然科学基金项目"东昆仑中新生代以来隆升作用过程及机制研究"(编号:40072062)资助
关键词
俄罗斯
贝加尔湖
伸展构造
中国
断陷盆地
岩石圈构造
地幔流动
Baikal rift system
Fen-Wei rift system
Extensional tectonics
Faulted basin in east China
Lithopshere tectonics
Mantle flux.
