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DOI	10.1016/j.tecto.2024.230318
	Effects of crustal rheology and fault strength on the formation of the Qaidam Basin: Results from 2-D mechanical modeling
	Zhou, Chao; He, Jiankun; Zhu, Xiaojie; Wang, Xinguo; Wang, Weimin
发表日期	2024
ISSN	0040-1951
EISSN	1879-3266
起始页码	879
卷号	879
英文摘要	The Cenozoic Qaidam Basin on the northern Tibetan Plateau is bounded by the foreland thrust belts of the East Kunlun Mountains to the south and Qilian Mountains to the north. In this basin, the maximum thickness of the accumulated sedimentary strata is similar to 17 km near the geographic center of the basin. Such a basin architecture challenges the classic foreland-basin deformation model, wherein substantial sediments should be localized near the basin margins owing to thrust loads on a bending plate. Based on the available geological and geophysical constraints, we built a two-dimensional viscoelastoplastic finite element model to investigate whether the unique pattern of the Qaidam Basin was mechanically related to the rheological structure of the crust and frictional strength of the basin-bounding thrust fault. By testing reasonable bounds on the viscosity of the ductile crust and effective frictional coefficient of the thrust faults, we modeled a basin framework that fits well with that of Qaidam Basin. The model parameters include a layered rheological structure, with the viscosity of the ductile crust of the basin being two orders of magnitude greater than that of the adjacent mountain belts and an effective frictional coefficient of >0.2. Furthermore, the initial width of the basin significantly affected its deformation style. Therefore, the layered rheological structure of the crust and frictional strength of the basin-bounding thrust faults played important roles in the formation of the Qaidam Basin. Our findings suggest that the inelastic behavior of the crust affects foreland deformation, highlighting that the classic foreland basin model must be revised for some tectonic settings.
英文关键词	Crustal rheology; Fault strength; Foreland deformation; Numerical modeling; Qaidam Basin
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001220879600001
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303608
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zhou, Chao,He, Jiankun,Zhu, Xiaojie,et al. Effects of crustal rheology and fault strength on the formation of the Qaidam Basin: Results from 2-D mechanical modeling[J]. 中国科学院青藏高原研究所,2024,879.
APA	Zhou, Chao,He, Jiankun,Zhu, Xiaojie,Wang, Xinguo,&Wang, Weimin.(2024).Effects of crustal rheology and fault strength on the formation of the Qaidam Basin: Results from 2-D mechanical modeling.TECTONOPHYSICS,879.
MLA	Zhou, Chao,et al."Effects of crustal rheology and fault strength on the formation of the Qaidam Basin: Results from 2-D mechanical modeling".TECTONOPHYSICS 879(2024).