秦岭-大巴拗拉槽

QINGLING-DABA AULACOGEN

秦德余 吉让寿 高长林 周克刚

Qin Deyu Ji Rangshou Gao Chanlin Zhou Kegang

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Ministry of Geology and Mineral Resources

通过对秦岭-大巴山沉积建造、构造变动及其演化特征的研究,认为它是一个在中国古地台解体的基础上,从震旦纪开始发育,直到三叠纪消亡,具有明显的多旋回性和强烈的横向分带性的近东西向延伸的不对称的垒堑式拗拉槽。并较详细地叙述该拗拉槽的发育阶段及其演化特征,分析作用力的方向及其所形成的逆冲断裂系及花式构造。

According to the recent studies on sedimentary, metamorphic, magmatic and volcanic formations, as well as the characteristics of later deformation stage in Qingling-Daba Area, it is believed that the aulacogen developed from Sinian to Triassic times with obvious polycycles and transversed zonation. The studied area experienced four stages of tension, faultdown, shortening and subsequent reformation. The authors of this paper suggest that the reformation also could take place during the period of formaion. As the small occeanic basins formed in Early Paleozoic within Shanxian-Erlangping region closed up by obduction, Qingling-Daba Aulacogen was shifted southward to Shanyang-Zhashui Area in late Caledonian Early Variscian. Thereafter, the aulacogen had continuously moved southward to Zhengan-Xunyang Area until the aulacogen itself ceased its aulacogenization. Qingling-Daba Area experienced the compression of horizontal Ew stress in late Indo-Chinese epoch while in late Yanshanian Himalayan, it was compressed by SN horizontal stress. The central belt of Shanxian-Erlang-ping thrusted to its both flanks in a large scale and finally the flower structures were formed.

https://doi.org/10.11781/sysydz198702104