气候变化领域集成服务门户(CCPortal): Magnetic Fabric Constraints on the Cenozoic Compressional Strain Changes in the Northern Qaidam Marginal Thrust Belt and Their Tectonic Implications

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DOI	10.1029/2019TC005989
	Magnetic Fabric Constraints on the Cenozoic Compressional Strain Changes in the Northern Qaidam Marginal Thrust Belt and Their Tectonic Implications
	Li, Bingshuai; Yan, Maodu; Zhang, Weilin; Pares, Josep M.; Fang, Xiaomin; Yang, Yongpeng; Zhang, Dawen; Guan, Chong; Bao, Jing
通讯作者	Yan, MD (通讯作者)
发表日期	2020
ISSN	0278-7407
EISSN	1944-9194
卷号	39 期号:6
英文摘要	Reconstructing the compressional strain history of the northern Qaidam marginal thrust belt has significant implications for understanding the mountain building processes of the northeastern Tibetan Plateau and the tectonic evolution of the Altyn Tagh Fault. However, the variation of compressional strain in this region has rarely been studied. Here, we present Cenozoic anisotropy of the low-field magnetic susceptibility records from the fluvial-lacustrine Hongliugou profile within the middle part of the northern Qaidam marginal thrust belt. The magnetic fabrics of the Shizigou Formation are dominated by a primary sedimentary magnetic fabric, whereas those of the lower Lulehe Formation are undetermined, most likely due to the conglomerate lithology; in contrast, the magnetic fabrics of the middle Lulehe to Shangyoushashan Formations, all of which are dominated by antiferromagnetic hematite and paramagnetic components with crystallographic preferred orientations, are mostly embryonic tectonic fabrics induced by prefolding layer-parallel shortening. Compared with previously reported paleomagnetic rotation results within the Hongliugou locality, the rotation-corrected compressional strain directions that are perpendicular to the rotation-corrected magnetic lineations exhibit a regular trend from nearly N-S before similar to 33 Ma to NE-SW at similar to 10 Ma. Integrated with other lines of evidence from the northern Qaidam Basin, we attribute the similar to 45 degrees successive clockwise rotations of the compressional strain directions to the propagation of significant strike-slip faulting along the Altyn Tagh Fault into the northern Qaidam marginal thrust belt that resulted in significant vertical axis clockwise rotations in the region.
关键词	ALTYN-TAGH FAULT TIBETAN PLATEAU CONSTRAINTS U-PB GEOCHRONOLOGY TIAN-SHAN AR-40/AR-39 THERMOCHRONOLOGY NORTHEASTERN MARGIN CLOCKWISE ROTATION MIOCENE SEDIMENTS HEXI CORRIDOR RED-BEDS
英文关键词	magnetic fabric; Altyn Tagh Fault; compressional strain; Qaidam; Cenozoic; rotation
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000546019000007
来源期刊	TECTONICS
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/260028
推荐引用方式 GB/T 7714	Li, Bingshuai,Yan, Maodu,Zhang, Weilin,et al. Magnetic Fabric Constraints on the Cenozoic Compressional Strain Changes in the Northern Qaidam Marginal Thrust Belt and Their Tectonic Implications[J]. 中国科学院青藏高原研究所,2020,39(6).
APA	Li, Bingshuai.,Yan, Maodu.,Zhang, Weilin.,Pares, Josep M..,Fang, Xiaomin.,...&Bao, Jing.(2020).Magnetic Fabric Constraints on the Cenozoic Compressional Strain Changes in the Northern Qaidam Marginal Thrust Belt and Their Tectonic Implications.TECTONICS,39(6).
MLA	Li, Bingshuai,et al."Magnetic Fabric Constraints on the Cenozoic Compressional Strain Changes in the Northern Qaidam Marginal Thrust Belt and Their Tectonic Implications".TECTONICS 39.6(2020).