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

CCPortal

DOI	10.1016/j.tecto.2021.228991
	Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene
	Li, Bingshuai; Yan, Maodu; Zhang, Weilin; Fang, Xiaomin
通讯作者	Yan, MD ; Zhang, WL (通讯作者)
发表日期	2021
ISSN	0040-1951
EISSN	1879-3266
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 similar to 16.0 +/- 10.3 degrees during similar to 27-17 Ma and a subsequent counterclockwise rotation of similar to 24.3 +/- 14.5 degrees during similar to 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 similar to 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.
关键词	NORTHERN TIBETAN PLATEAU MIDDLE MIOCENE REORGANIZATION CENOZOIC TECTONIC EVOLUTION QAIDAM BASIN FOLD TEST HEXI CORRIDOR THRUST BELT DEFORMATION CONSTRAINTS UPLIFT
英文关键词	Altyn Tagh Fault; Paleomagnetic rotation; Northern Qaidam marginal thrust belt; Heishiqiu; Strike-slip faulting
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000685264800007
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/260223
推荐引用方式 GB/T 7714	Li, Bingshuai,Yan, Maodu,Zhang, Weilin,et al. Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene[J]. 中国科学院青藏高原研究所,2021,815.
APA	Li, Bingshuai,Yan, Maodu,Zhang, Weilin,&Fang, Xiaomin.(2021).Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene.TECTONOPHYSICS,815.
MLA	Li, Bingshuai,et al."Bidirectional growth of the Altyn Tagh Fault since the Early Oligocene".TECTONOPHYSICS 815(2021).