Thrust and strike-slip deformation sequence of Micangshan structural belt
Online published: 2011-08-20
Micangshan structural belt is located in northern margin of Yangtze plate, which has transition relations with Longmen Mountain in west and south Daba Mountain in east. Under the multiple geodynamics of its peripheral orogenic belts, the study on structure and evolution of Micangshan structural belt is very important. Based on joint plane and scratch measured in Micangshan structural belt, Wulff net is applied to recover the palaeostress field. According to the intersection relation of joint fissures and the chronologic age of joint plane, combining with existing chronology data and fault features, the structure evolution ofMicangshan structural belt is reconstructed firstly. Micangshan structural belt experienced five phases of tectonic movement:①From200Ma to 160Ma, N-S thrusting compressional movement;②From 120 Ma to 100 Ma, S-Nstrike-slipping compressional movement;③95Ma, NW-SE compressional movement; ④From 50 Ma to 40 Ma, NE-SW compressional movement; ⑤15Ma, E-W compressional movement. In generally, the first and second phases of palaeostress field formed the Micangshan uplift and the E-Wstructures in the front area ofMicangshan, the third and fourth phases of palaeostress field superimposed the early structures and then formed superimposed structures in the front, and the fifth phase of palaeostress field finally make the Micangshan structure belt formed.
GAO Changhai , ZHANG Xinzheng , ZHA Ming , WANG Xiaoyan . Thrust and strike-slip deformation sequence of Micangshan structural belt[J]. Lithologic Reservoirs, 2011 , 23(4) : 81 -87 . DOI: 10.3969/j.issn.1673-8926.2011.04.015
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