气候变化领域集成服务门户(CCPortal): Paleomagnetic Rotation Constraints on the Deformation of the Northern Qaidam Marginal Thrust Belt and Implications for Strike-Slip Faulting Along the Altyn Tagh Fault

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DOI	10.1029/2018JB015753
	Paleomagnetic Rotation Constraints on the Deformation of the Northern Qaidam Marginal Thrust Belt and Implications for Strike-Slip Faulting Along the Altyn Tagh Fault
	Li, Bingshuai; Yan, Maodu; Zhang, Weilin; Fang, Xiaomin; Yang, Yongpeng; Zhang, Dawen; Chen, Yi; Guan, Chong
通讯作者	Yan, MD (通讯作者)
发表日期	2018
ISSN	2169-9313
EISSN	2169-9356
起始页码	7207
结束页码	7224
卷号	123 期号:9
英文摘要	Discordant Cenozoic paleomagnetic rotation results obtained throughout the northeastern Tibetan Plateau have yielded different tectonic models for the evolution of the Altyn Tagh Fault and the northeastern Tibetan Plateau. Here based on detailed existing magnetostratigraphic age constraints, we carried out an in-depth paleomagnetic study along the Hongliugou section in the middle northern Qaidam marginal thrust belt to address the Cenozoic rotations of this region. A total of 1,342 Jurassic-Neogene siltstone-sandstone core samples were collected from 128 sites across 18 time intervals. Rock magnetic analysis suggested that magnetite and hematite are the dominant magnetic carriers. Detailed thermal demagnetization analyses were performed, and the characteristic remanent magnetizations of 90 sites (743 samples) were obtained, which yielded positive fold and reversals tests, indicating that they likely represent primary magnetizations. Detailed paleomagnetic declination versus age analyses revealed three periods of rotations: 12.515.7 degrees statistically insignificant counterclockwise rotations during 45-33Ma, successive clockwise rotations of 32.215.4 degrees during 33-14Ma, and subsequent statistically insignificant counterclockwise rotations of 8.79.4 degrees after 14Ma. These three periods of rotations are similar to those calculated based on previously available magnetostratigraphic data from the nearby Dahonggou section. Based on the integration of these data with other lines of geological evidence, we attributed the latter two periods of rotations to fast strike-slip faulting along the Altyn Tagh Fault.
关键词	APATITE FISSION-TRACK CENOZOIC TECTONIC EVOLUTION NE TIBETAN PLATEAU U-PB GEOCHRONOLOGY QILIAN-SHAN NORTHEASTERN MARGIN FOLD TEST BASIN IMPLICATIONS MIOCENE SEDIMENTS NORTHWEST CHINA
英文关键词	Cenozoic; paleomagnetic rotations; Altyn Tagh Fault; northern Qaidam marginal thrust belt
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000447858800001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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/259216
推荐引用方式 GB/T 7714	Li, Bingshuai,Yan, Maodu,Zhang, Weilin,et al. Paleomagnetic Rotation Constraints on the Deformation of the Northern Qaidam Marginal Thrust Belt and Implications for Strike-Slip Faulting Along the Altyn Tagh Fault[J]. 中国科学院青藏高原研究所,2018,123(9).
APA	Li, Bingshuai.,Yan, Maodu.,Zhang, Weilin.,Fang, Xiaomin.,Yang, Yongpeng.,...&Guan, Chong.(2018).Paleomagnetic Rotation Constraints on the Deformation of the Northern Qaidam Marginal Thrust Belt and Implications for Strike-Slip Faulting Along the Altyn Tagh Fault.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(9).
MLA	Li, Bingshuai,et al."Paleomagnetic Rotation Constraints on the Deformation of the Northern Qaidam Marginal Thrust Belt and Implications for Strike-Slip Faulting Along the Altyn Tagh Fault".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.9(2018).