Soft-sediment deformation structures from the Upper Triassic Taishanmiao Formation of the Nanzhao Basin in Henan Province and their palaeogeographic significances
Yang Wentao Wang Min
Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454003,Henan
Abstract：A lot of soft-sediment deformation structures,including synsedimentary faults,liquefied homogeneous layers and water escape veins,diapirs,plastic deformation,cataclasites and large load structures,occurred in the Upper Triassic Taishanmiao Formation of the Nanzhao Basin in Henan Province. They mainly cluster together in the middle part of deep lacustrine deposits,which is the transitional zone between the lower deep water and the upper shallow water. Most of the soft￣sediment deformation structures are preserved in turbidites,except for the synsedimentary faults in shales. The major trigger mechanism of the soft-sediment deformation structures is the palaeoearthquake,although the depositional process of turbidite may play a role. The liquefied,plastic and brittle deformation structures are considered as the indicater of the high magnitude palaeoearthquake,which record the intense orogenic movements of the Qinling orogen during the Late Triassic. With the thrusting of the Qinling orogen,the Nanzhao Basin was uplifted,whereas the synchronous Jiyuan Basin,adjacent to the north,was subsided. They most likely represent the wedgetop depozone and the foredeep depozone of the foreland basin system respectively.
基金资助:*国家自然科学基金项目(编号: 41440016)、国家自然科学基金青年科学基金(编号: 41502106)、河南理工大学博士基金(编号: B2013-076)联合资助; [Co-funded by the National Natural Science Foundation of China(No.41440016),the Young Scientists Fund of National Natural Science Foundation of China(No.41502106),and the Doctor Foundation of Henan Polytechnic University(No: B2013-076)]
. Soft-sediment deformation structures from the Upper Triassic Taishanmiao Formation of the Nanzhao Basin in Henan Province and their palaeogeographic significances[J]. JOPC, 2017, 19(1): 117-128.
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