![]() ![]() Subsequently, SB5 underwent several strike slips of weak strength. The R-shears were transtensional during the progressive deformation. The second activity of SB5 occurred at the end of the late Ordovician, during which it was a dextral transtensional strike-slip deformation belt consisting of left-stepping en echelon R-shears. Although these structures show clear boundaries between them, they correspond to the same formation time, indicating that they underwent deformation simultaneously. Along the vertical profiles, various structural styles occurred at various depths and strata in response to various stratigraphy mechanisms. In the plan view, R-shears and P-shears with local transpressional and transtensional structures were observed. SB5 was formed as a dextral simple shear belt at the end of the Middle Ordovician. To this end, its structural framework, tectonic evolution, and associated plate tectonics were investigated using 2D and 3D seismic data. In this study, models of plan view and vertical profile were established to interpret SB5 with multi-cycled tectonic activities. The Shunbei 5 fault belt (SB5), a long strike-slip deformation belt in the Tarim Basin, played an important role in the formation of a recently discovered major oilfield known as the Shunbei oilfield. Strike-slip deformation belts are interesting structures in the crust and are of significance in petroleum exploration. 3China University of Petroleum-Beijing at Karamay, Karamay, China.2College of Geosciences, China University of Petroleum, Beijing, China.1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China. ![]() Haowei Yuan 1,2*, Shuping Chen 1,2*, Yuan Neng 3, Huaibo Zhao 1,2, Shidong Xu 1,2, Xinpeng Wang 1,2 and Guimin Feng 1,2 ![]()
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January 2023
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