酒泉盆地南缘新生代冲断带的变形特征和变形时间

doi:10.11743/ogg20060408

Abstract

Abstract:

The multi-layer thrust belt in the southern margin of Jiuquan basin consists of a long distance shallow thrust system,a short distance middle thrust system,and a deep in-situ thrust system.The long distance thrust system is composed of Ordovician and Silurian and some part of it shows as a klippe.The short distance thrust system that hides under the long distance thrust system and locally crops out as a structural window is composed of Paleozoic and Mesozoic and has the deformation style of imbricate structure.The in-situ thrust system,with duplex or stacking structure in its south,a simpler deformation of propagation fold and fault-bend fold in its northeast,and a pop-up in its front,is under the short distance thrust system and the Quaternary.The thrust belt in the southern margin of Jiuquan basin occurs as a thin-skinned thrust system with a large structural shortening of 52.7 km and a shortening rate of 55.1% on the Hanxia section.Deformation of the thrust belt started at about 9 Ma and extended northward progressively,with faulting beginning at 8.3 Ma in the front of thrust belt.

Key words: shortening, shortening rate, deformation time, deformation structure, thrust belt, Cenozoic, southern Jiuquan basin

CLC Number:

TE111.2

Chen Hanlin, Yang Shufeng, Xiao Ancheng, Pan Zhengzhong, Cheng Xiaogan, Chen Jianjun, Fan Mingtao, Tian Duowen. Deformation characteristics and time of Cenozoic thrust belt in southern margin of Jiuquan basin[J]. Oil & Gas Geology, 2006, 27(4): 488-494.

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Deformation characteristics and time of Cenozoic thrust belt in southern margin of Jiuquan basin

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