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The Dihedral Angle and Intersection processes of a Conjugate Strike-Slip Fault System in the Tarim Basin, NW China

Acta Geologica Sinica(English Edition) 2018年第1期92卷 74-88页

作者： WU Guanghui YUAN Yajuan HUANG Shaoying Thomas Matthew Vandyk XIAO Yang CAI Quan LUO Bingxu Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering School of Marine Sciences Sun Yat-sen University Guangzhou 510006 China PetroChina Tarim Oilfield Company Korla 841000 China Department of Earth Sciences Royal Holloway and Bedford New College University of London Egham Surrey TW20 OEX UK

Recent studies, focused on dihedral angles and intersection processes, have increased understandings of conjugate fault mechanisms. We present new 3-D seismic data and microstructural core analysis in a case study of a large conjugate strike-slip fault system from the intracratonic Tarim Basin, NW China. Within our study area, ＂X＂ type NE and NW trending faults occur within Cambrian- Ordovician carbonates. The dihedral angles of these conjugate faults have narrow ranges, 19~ to 62~ in the Cambrian and 26~ to 51~ in the Ordovician, and their modes are 42~ and 44~ respectively. These data are significantly different from the ~60~ predicted by the Coulomb fracture criterion. It is concluded that：（1） The dihedral angles of the conjugate faults were not controlled by confining pressure, which was low and associated with shallow burial; （2） As dihedral angles were not controlled by pressure they can be used to determine the shortening direction during faulting; （3） Sequential slip may have played an important role in forming conjugate fault intersections; （4） The conjugate fault system of the Tarim basin initiated as rhombic joints; these subsequently developed into sequentially active ＂X＂ type conjugate faults; followed by preferential development of the NW-trending faults; then reactivation of the NE trending faults. This intact rhombic conjugate fault system presents new insights into mechanisms of dihedral angle development, with particular relevance to intracratonic basins.

关键词： Conjugate fault strike-slip dihedral angle fault intersection faulting process Carbonate

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