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Cenozoic structural deformation in the Yuqia-Jiulongshan region, northern Qaidam Basin, China
Received date: 2019-05-14
Revised date: 2019-12-10
Online published: 2020-02-19
Supported by
Supported by the China National Science and Technology Major Project(2016ZX05003-001);Supported by the China National Science and Technology Major Project(2017ZX05008-001)
Based on field geological survey, interpretation of seismic reflection profile and thermochronology dating, this paper systematically studied the structural deformation of the Yuqia-Jiulongshan region in northern Qaidam Basin during the Cenozoic. The results show that the area is primarily dominated by a large box-shaped anticline, with steep limbs and a wide and gently-deformed core. The Mahaigaxiu and Jiulongshan anticlines are secondary folds controlled by secondary faults in the limbs of the box-shaped anticline. Whereas the Yuqia and the Northern Yuqia anticlines are secondary folds within the wide core of the box-shaped anticline. The geometry of the box-shaped anticline is mainly controlled by some high-angle reverse faults with certain right-lateral strike-slip components, displaying distinct positive flower structures in section view. Combining the sedimentary correlation and detrital apatite fission track analysis, we believe that the Yuqia-Jiulongshan region was a paleo-uplift that developed slightly in the early Cenozoic, resulting in the relatively thin Cenozoic strata. The intense deformation that shaped the present-day structural framework occurred in or after the sedimentary period of Shizigou Formation. The Yuqia - Jiulongshan paleo-uplift is adjacent to the Sainan depression that is rich in Lower-Middle Jurassic source rocks, and thus has high potential for future hydrocarbon exploration.
Siyuan CHEN , Yongshu ZHANG , Lei WU , Junyong ZHANG , Liqun WANG , Ancheng XIAO , Ya SHEN . Cenozoic structural deformation in the Yuqia-Jiulongshan region, northern Qaidam Basin, China[J]. Petroleum Exploration and Development, 2020 , 47(1) : 114 -123 . DOI: 10.1016/S1876-3804(20)60010-6
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