柴达木盆地北缘的右行走滑冲断系统及其动力学

doi:10.11743/ogg20060407

摘要/Abstract

摘要：

通过对于断裂系统分析和地球物理资料的解释,证实了柴达木盆地北缘西段的主要构造形成时间为上新世以后,变形样式为一系列右行走滑冲断构造。走滑冲断构造带内部的断层在平面上呈分支复合,剖面上表现为正花状构造,断层上、下盘地层层序无法直接对比。右行走滑冲断构造形成于南祁连由北向南的斜向推覆作用,而主要应力来源于柴达木地块北缘由南向北的陆内俯冲作用。用一个运动学模型解释了柴北缘的右行走滑冲断作用机制。

关键词: 右行走滑, 冲断构造, 运动学, 柴达木盆地, 南祁连山

Abstract:

Interpretation of geophysical data and analysis of fault systems confirm that structures in the northern margin of Qaidam basin were formed after the Pliocene and occur as a series of right-lateral strike-slip thrusts.The faults within the strike-slip thrust belts occur as structure in sectional view,thus direct correlation of strata between the hanging wall and footwall is impossible. The formation of the right-lateral oblique thrust belts were controlled by the N-S oblique thrusting of South Qilian Orogeny and the main terrestrial stress came from the S-N intracontinental subduction of the north margin of Qaidam massive.To interpret the right-lateral strike-slip thrusting,a kinematics model is also provided.

Key words: Qaidam basin, right-lateral strike-slip thrust, South Qilian Orogeny, dynamics

中图分类号:

TE112.2

肖安成,杨树锋,程晓敢,等. 柴达木盆地北缘的右行走滑冲断系统及其动力学[J]. 石油与天然气地质, 2006, 27(4): 482-487,494. doi: 10.11743/ogg20060407 Xiao Ancheng,Yang Shufeng,Chen Xiaogan,et al. Right-lateral strike-slip thrust system and its dynamics along the northern margin of Qaidam basin[J]. Oil & Gas Geology, 2006, 27(4): 482-487,494. doi: 10.11743/ogg20060407

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