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Origin and growth mechanisms of strike-slip faults in the central Tarim cratonic basin, NW China

Petroleum Exploration and Development 2021年第3期48卷 595-607页

作者： WU Guanghui MA Bingshan HAN Jianfa GUAN Baozhu CHEN Xin YANG Peng XIE Zhou School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China PetroChina Key Laboratory of Carbonate Reservoir Southwest Petroleum UniversityChengdu 610500China Tarim Oilfield Company PetroChinaKorla 841000China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China

Through fault structure analysis and chronology study, we discuss the origin and growth mechanisms of strike-slip faults in the Tarim Basin.(1) Multiple stages strike-slip faults with inherited growth were developed in the central Tarim cratonic basin. The faults initiation time is constrained at the end of Middle Ordovician of about 460 Ma according to U-Pb dating of the fault cements and seismic interpretation.(2) The formation of the strike-slip faults was controlled by the near N-S direction stress field caused by far-field compression of the closing of the Proto-Tethys Ocean.(3) The faults localization and characteristics were influenced by the pre-existing structures of the NE trending weakening zones in the basement and lithofacies change from south to north.(4) Following the fault initiation under the Andersonian mechanism, the strike-slip fault growth was dominantly fault linkage, associated with fault tip propagation and interaction of non-Andersonian mechanisms.(5) Sequential slip accommodated deformation in the conjugate strike-slip fault interaction zones, strong localization of the main displacement and deformation occurred in the overlap zones in the northern Tarim, while the fault tips, particularly of narrow-deep grabens, and strike-slip segments in thrust zones accumulated more deformation and strain in the Central uplift. In conclusion, non-Andersonian mechanisms, dominantly fault linkage and interaction, resulted in the small displacement but long intraplate strike-slip fault development in the central Tarim Basin. The regional and localized field stress, and pre-existing structures and lithofacies difference had strong impacts on the diversity of the strike-slip faults in the Tarim cratonic basin.

关键词： strike-slip fault fault dating fault growth mechanism non-Andersonian faulting stress field pre-existing structure Tarim Basin

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Concordant structural variations from the surface to the base of the upper mantle in the North China Craton and its tectonic implications

Concordant structural variations from the surface to the bas...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Ling Chen~* Seismological Laboratory(SKL-LE),Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

This study presents an integrated study of the North China Craton(NCC)based on recent high-resolution seismic images combined with observations on surface geology,regional tectonics and mantle dynamics. Seismic images reveal markedly concordant and rapid variations in crustal and lithospheric structure and thickness,upper mantle anisotropy,and discontinuity structures and thickness of the mantle transition zone near the boundary between the eastern and central parts of the *** rapid variations roughly coincide with the sudden change in both surface topography and gravity field as marked by the North-South Gravity Lineament(NSGL).Such a shallow-deep structural concordance may reflect different lithospheric tectonics and mantle processes in the two domains during the Phanerozoic reactivation of the *** structural variations are particularly present to the west of the NSGL,especially between the Archean Ordos Plateau, which retains the characteristics of a typical craton,and the surrounding Cenozoic rift systems which are underlain by a significantly modified and thinned *** observations provide deep structural evidence that the Phanerozoic reactivation was not confined to the eastern NCC as previously thought,but also affected areas in the central and western NCC,though to a much lesser *** both sides of the NSGL, lithospheric modification and thinning appear to be more pronounced along Paleoproterozoic belts suturing Archean blocks,demonstrating the importance of pre-existing lithosphere-scale structures in controlling the tectonic evolution of the *** further indicates that craton reactivation probably is common given the fact that structural heterogeneities are always present in cratonic *** seismic structural images together with geological,petrological,geochemical and mineral physics data suggest that the fundamental destruction of the eastern NCC lithosphere may have been triggered largely by the deep subduction of t

关键词： North China Craton Lithospheric reactivation Concordant structural variation pre-existing structure Pacific subduction

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