气候变化领域集成服务门户(CCPortal): Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin

CCPortal

DOI	10.1016/j.tecto.2021.229142
	Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin
	Li, Bingshuai; Yan, Maodu; Zhang, Weilin; Fang, Xiaomin; Yang, Yongpeng; Zhang, Dawen; Guan, Chong; Bao, Jing
通讯作者	Yan, MD (通讯作者)
发表日期	2021
ISSN	0040-1951
EISSN	1879-3266
卷号	821
英文摘要	The timing and mechanism of the changes in the stress/strain field direction on the northeastern Tibetan Plateau are controversial, which limits our understanding of the tectonic evolution of the northeastern Tibetan Plateau and the Altyn Tagh Fault (ATF). Here, we conducted a detailed anisotropy of low-field magnetic susceptibility analysis of successive fluvial-lacustrine sediments deposited since the early Oligocene at Eboliang in the middlewestern Qaidam Basin. Magnetic fabrics of the upper part (the Qigequan Formation) are predominantly considered to be primary sedimentary magnetic fabrics, while those of the lower-middle parts (the Shangganchaigou to Shizigou Formations) are mainly pre-folding, layer-parallel shortening induced embryonic tectonic fabrics. The magnetic lineation revealed similar to 50 degrees successive clockwise rotations of the compressional strain orientations from nearly N-S to NE-SW in the middle-western Qaidam Basin during similar to 15-7 Ma. The nearly N-S compressional event is consistent with the generally N-S-directed India-Asia collision and thus was attributed to its far-field effects, whereas the post-mid-Miocene transition of similar to 50 degrees clockwise rotations of the compressional strain orientations is consistent with the tectonic deformation in the basin interior. This transition lagged far behind that in the northern Qaidam marginal thrust belt (NQMTB), which began in the early Oligocene. The laterally diachronous transition in compressional strain orientation and deformations in the middle-western and northern Qaidam Basin were most likely due to the two-stage, sinistral strike-slip faulting of the ATF, with confined sinistral shear occurring along the ATF and partially transferred into the NQMTB during the early Oligocene to middle Miocene, while distributed sinistral shear occurred on the northeastern Tibetan Plateau beginning in the middle Miocene. A bidirectional propagation of compressional strain variation and tectonic deformation from the northern Qaidam Basin since the early Oligocene is proposed to reflect the tectonic evolution of the northeastern Tibetan Plateau.
关键词	CENOZOIC TECTONIC EVOLUTION NORTHERN TIBETAN PLATEAU MIDDLE MIOCENE REORGANIZATION NORTHEASTERN MARGIN HEXI CORRIDOR TIAN-SHAN TOPOGRAPHIC GROWTH CLIMATE-CHANGE THRUST BELT UPLIFT
英文关键词	Anisotropy of magnetic susceptibility; Compressional strain; Rotations; Qaidam Basin; Eboliang; Altyn Tagh Fault
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000721721600004
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/260451
推荐引用方式 GB/T 7714	Li, Bingshuai,Yan, Maodu,Zhang, Weilin,et al. Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin[J]. 中国科学院青藏高原研究所,2021,821.
APA	Li, Bingshuai.,Yan, Maodu.,Zhang, Weilin.,Fang, Xiaomin.,Yang, Yongpeng.,...&Bao, Jing.(2021).Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin.TECTONOPHYSICS,821.
MLA	Li, Bingshuai,et al."Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin".TECTONOPHYSICS 821(2021).