气候变化领域集成服务门户(CCPortal): Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau

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DOI	10.1029/2022TC007620
	Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau
	Dai, Shuang; Ma, Xiaojun; Zhao, Zhenbin; Fan, Xin; Wang, Yilin; Wang, Zixuan; Zhang, Xiang; Cai, Lipiao; Deng, Wei; Hou, Xubo; Xu, Jianjun; Li, Jiasheng
发表日期	2023
ISSN	0278-7407
EISSN	1944-9194
卷号	42 期号:4
英文摘要	Basin evolution along the northeastern Tibetan Plateau related to the Altyn Tagh Fault (ATF) has significant implications for deciphering the formation of the Tibetan Plateau. However, the Mesozoic history of the ATF is still not well understood. In this contribution, we present a comprehensive sedimentologic and provenance analysis of the Jurassic Dunhuang Basin (DHB) to reconstruct the basin prototype and evolution and to discuss the early history of the ATF. The basin infill consists of late-Early through Late Jurassic sediments interbedded with basalt, which were deposited in alluvial to lacustrine environments during the Early to Middle Jurassic, and in fluvial to fan delta environments during the Late Jurassic. The analyses of gravel component, paleocurrent and detrital zircon U-Pb geochronology indicate that the clastic sediments were mainly derived from peripheral areas of the Bei Shan (north), Altyn Tagh-Qilian Shan (south), and the internal Sanwei Shan. Combined with seismic reflection data interpretations, our results suggest that rifting started by the activation of bilateral boundary faults during the Early Jurassic. This was followed by extension and associated magmatism due to subcrustal ductile necking and increased heat flux during the Middle Jurassic, and by final transformation into subsidence sag related to boundary fault die-out or weakening during the Late Jurassic. We conclude that the DHB formed in an extensional setting generated by the far-field effects of the Bangong-Nujiang Ocean closure during the Jurassic, and that the ATF consisted of three subordinate normal faults rather than a sinistral strike-slip fault during the Jurassic.
关键词	Jurassic detrital zircon geochronology sedimentation basin evolution Altyn Tagh Fault
英文关键词	ZIRCON U-PB; STRIKE-SLIP MOVEMENT; PALEOZOIC MULTIPLE ACCRETIONARY; OROGENIC BELT INSIGHTS; TECTONIC EVOLUTION; NW CHINA; TARIM CRATON; QILIAN SHAN; FISSION-TRACK; QAIDAM BASIN
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000973057600001
来源期刊	TECTONICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283525
作者单位	Ministry of Natural Resources of the People's Republic of China; Lanzhou University; Lanzhou University
推荐引用方式 GB/T 7714	Dai, Shuang,Ma, Xiaojun,Zhao, Zhenbin,et al. Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau[J],2023,42(4).
APA	Dai, Shuang.,Ma, Xiaojun.,Zhao, Zhenbin.,Fan, Xin.,Wang, Yilin.,...&Li, Jiasheng.(2023).Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau.TECTONICS,42(4).
MLA	Dai, Shuang,et al."Jurassic Evolution of the Dunhuang Basin and Its Implications for the Early History of the Altyn Tagh Fault, Northeast Tibet Plateau".TECTONICS 42.4(2023).