气候变化领域集成服务门户(CCPortal): Anisotropy of Magnetic Susceptibility Reveals Late Miocene Tectonic Activity in the Western Qaidam Basin

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DOI	10.3389/feart.2022.845924
	Anisotropy of Magnetic Susceptibility Reveals Late Miocene Tectonic Activity in the Western Qaidam Basin
	Zhang, Weilin; Li, Bingshuai; Yan, Maodu
通讯作者	Zhang, WL (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	The western Qaidam Basin on the northeastern Tibetan Plateau located at the intersection between the Altyn Tagh Fault and the Kunlun Fault/Qimen Tagh Fault holds significant potential to reveal the tectonic process of these two faults as well as the evolution of the Qaidam Basin. In this paper, we conducted detailed anisotropy of magnetic susceptibility (AMS) records from Late Cenozoic sediments at the Qigequan section in the western Qaidam Basin to shed new light on the tectonic processes in this region. Based on the distribution of three principal axes of magnetic fabrics as well as magnetic fabric parameters, the AMS records can be divided into three parts. The lower part (similar to 6.9-4.6 Ma), mainly made of fine-grained mudstone and siltstone, exhibits three well-grouped principal axes with a NE-SW elongated K-min axis as the embryonic tectonic magnetic fabric, suggesting constant NE-SW compressional strain. The middle part (similar to 4.6-3.0 Ma), characterized by mudstone, siltstone and sandstone, shows three less grouped principal axes and suggests a relatively weak and stable tectonic environment. The three principal axes of the upper part (similar to 2.4-0.4 Ma) is composed of sandstone and conglomerate of the Qigequan Formation, similar to the middle part, which was primarily attributed to the coarse lithology and not sensitive to tectonics since similar to 2.6 Ma. The NE-SW compressional strain in the western Qaidam Basin is consistent with that in the northeastern basin, both of which are parallel to the upper crust movements revealed by the GPS, suggesting the dominant NE-SW compressional strain in the western and northern basins in the late Cenozoic. The decreasing magnitude of tectonic activities during similar to 6.9-4.6 Ma indicates that the major geological units released most of the compressional strain in the western Qaidam Basin during tectonic activity that initiated in the early-late Miocene.
关键词	NE TIBETAN PLATEAU ALTYN-TAGH FAULT SEVIER THRUST BELT CENOZOIC UPLIFT WEDGE TECTONICS CHINESE LOESS GROWTH STRATA DEFORMATION EVOLUTION MAGNETOSTRATIGRAPHY
英文关键词	anisotropy of magnetic susceptibility; northeastern Tibetan Plateau; Qaidam Basin; Qigequan; late Cenozoic; magnetic fabric
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000790342900001
来源期刊	FRONTIERS IN EARTH SCIENCE
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/260584
推荐引用方式 GB/T 7714	Zhang, Weilin,Li, Bingshuai,Yan, Maodu. Anisotropy of Magnetic Susceptibility Reveals Late Miocene Tectonic Activity in the Western Qaidam Basin[J]. 中国科学院青藏高原研究所,2022,10.
APA	Zhang, Weilin,Li, Bingshuai,&Yan, Maodu.(2022).Anisotropy of Magnetic Susceptibility Reveals Late Miocene Tectonic Activity in the Western Qaidam Basin.FRONTIERS IN EARTH SCIENCE,10.
MLA	Zhang, Weilin,et al."Anisotropy of Magnetic Susceptibility Reveals Late Miocene Tectonic Activity in the Western Qaidam Basin".FRONTIERS IN EARTH SCIENCE 10(2022).