气候变化领域集成服务门户(CCPortal): Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene

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DOI	10.1016/j.tecto.2021.228991
	Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene
	Li B.; Yan M.; Zhang W.; Fang X.
发表日期	2021
ISSN	00401951
卷号	815
英文摘要	The Cenozoic evolution of the Altyn Tagh Fault (ATF) is still under debate. Here, we present new paleomagnetic rotation evidence on curvatures south of the ATF in the northeastern Tibetan Plateau to shed new light on this issue. A total of 498 core samples representing 53 sites and 6 time intervals (a-f) were collected from the post-Oligocene sequence at the Heishiqiu locality that in the junction of the northwestern and middle of the reverse S-type northern Qaidam marginal thrust belt. Rock magnetic analysis indicated that the main magnetic carriers were hematite and magnetite. After detailed thermal demagnetization analyses, the characteristic remanent magnetizations of 48 sites (387 samples), which exhibited dual polarities and passed a regional fold test, are most likely the primary magnetizations. Two periods of remarkable rotations are identified at Heishiqiu: a clockwise rotation of ~16.0 ± 10.3° during ~27–17 Ma and a subsequent counterclockwise rotation of ~24.3 ± 14.5° during ~17–10 Ma. The rotations were attributed to two periods of strike-slip faulting along the ATF during the Early Oligocene to Late Miocene, yielding at least ~290–380 km of offset at Heishiqiu. The integrated lines of paleomagnetic and geological evidence suggest that the deformation along the ATF has propagated both southwestward and northeastward from Heishiqiu in the middle ATF since the Early Oligocene. We propose a bidirectional growth model for the ATF that might be applicable to the evolution of the Tibetan Plateau. © 2021 Elsevier B.V.
关键词	Altyn Tagh Fault Heishiqiu Northern Qaidam marginal thrust belt Paleomagnetic rotation Strike-slip faulting
英文关键词	Hematite; Lithology; Magnetite; Magnetization; Strike-slip faults; Clockwise rotation; Counter clockwise rotation; Northeastern tibetan plateaux; Paleomagnetic rotations; Primary magnetization; Remanent magnetization; Strike slip faulting; Thermal demagnetization; Rotation
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208004
作者单位	School of Earth Sciences, East China University of Technology, Nanchang, China; State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li B.,Yan M.,Zhang W.,et al. Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene[J],2021,815.
APA	Li B.,Yan M.,Zhang W.,&Fang X..(2021).Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene.Tectonophysics,815.
MLA	Li B.,et al."Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene".Tectonophysics 815(2021).