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| Origin and growth mechanisms of strike-slip faults in the central Tarim cratonic basin, NW China |
| WU Guanghui1,2, Ma Bingshan1,2, HAN Jianfa3, GUAN Baozhu3, CHEN Xin1, YANG Peng4, XIE Zhou3 |
1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, Chengdu 610500, China;
3. Tarim Oilfield Company, PetroChina, Kuerle 841000, China;
4. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China |
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Abstract Through fault structure analysis, fracture cements U-Pb dating, and regional structure analysis, 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 age is constrained at about 460 Ma according to U-Pb dating in the fault cements and the fault termination layers in seismic sections. (2) The formation of the strike-slip faults were controlled by the near N-S direction regional stress field caused by far-field compression of the closing of the Proto-Tethys Ocean. (3) The pre-existing structures of the NE trending weakening zones in the basement, the structure boundary and the platform margin impacted the faults localization and characteristics in the different units 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 and strain in the 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 system in the central Tarim basin. The regional and localized field stress, and pre-existing structures and lithofacies had strong impacts on the diversity of the strike-slip faults in the Tarim intracratonic basin.
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Received: 11 February 2020
Published: 19 October 2020
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