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DOI	10.1016/j.tecto.2010.07.015
	Paleomagnetic evidence for clockwise rotation and tilting in the eastern Tethyan Himalaya (SE Tibet): Implications for the Miocene tectonic evolution of the NE Himalaya
	Antolin, Borja; Appel, Erwin; Gloaguen, Richard; Dunkl, Istvan; Ding, Lin; Montomoli, Chiara; Liebke, Ursina; Xu, Qiang
通讯作者	Antolin, B (通讯作者)
发表日期	2010
ISSN	0040-1951
起始页码	172
结束页码	186
卷号	493 期号:1-2
英文摘要	Crustal movement around and away from the Namche Barwa syntaxis is indicated in the Asian velocity field inferred from GPS data and Quaternary fault slip rates. Nevertheless, there is a limited field-based control on the rotational history of the north-eastern Himalayan arc. Exploring the poly-phase nature of deformation, within the Cretaceous diorite dykes and their host-rock (Triassic flysch), in the eastern Tethyan Himalaya (90 degrees-92 degrees E), combined with new remote sensing data and existing thermo-geochronological data, allow us to unravel the kinematic relationship between paleomagnetic remanence vectors and the deformation phases. Decay at 325 degrees C in high temperature susceptibility curves and in the thermal demagnetization of the SIRM indicate that the characteristic remanent magnetization in the Cretaceous diorite dykes is carried by pyrrhotite. The pyrrhotite component unblocks at 280-350 degrees C, revealing normal and reverse polarities. It is of post-folding origin with a mean remanence direction of 019 degrees/28 degrees and 001 degrees/20 degrees in the eastern (Qonggyai valley) and western (Nagarze) part of the sampling area, respectively. The similar to 22 Ma K-Ar age of the last metamorphic event support that the remanence is post-Eohimalayan folding and likely of thermoremanent or thermo-chemical origin. Comparison of the declination with respect to the Early-Miocene reference direction, yields a trend from no apparent rotation in the west to 20 degrees clockwise rotation in the east with respect to the stable Indian plate. This result can be kinematically related to the Middle to Late-Miocene strain partitioning between far-field southeast extrusion of SE Tibet and near-field strike-slip faulting and E-W extension. Furthermore the observed pattern of tilting around horizontal axis may reflect concealed North Himalayan doming. (C) 2010 Elsevier B.V. All rights reserved.
关键词	INDIA-ASIA COLLISION LEFT-SLIP FAULTS SOUTHERN TIBET CENTRAL NEPAL OROGEN-PARALLEL CONTINENTAL COLLISION STRUCTURAL EVOLUTION SOUTHEASTERN TIBET WESTERN HIMALAYA GROWTH-MECHANISM
英文关键词	Tethyan Himalaya; Paleomagnetism; Pyrrhotite; SE Tibet; Miocene; Tectonics
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000283700800012
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/257823
推荐引用方式 GB/T 7714	Antolin, Borja,Appel, Erwin,Gloaguen, Richard,et al. Paleomagnetic evidence for clockwise rotation and tilting in the eastern Tethyan Himalaya (SE Tibet): Implications for the Miocene tectonic evolution of the NE Himalaya[J]. 中国科学院青藏高原研究所,2010,493(1-2).
APA	Antolin, Borja.,Appel, Erwin.,Gloaguen, Richard.,Dunkl, Istvan.,Ding, Lin.,...&Xu, Qiang.(2010).Paleomagnetic evidence for clockwise rotation and tilting in the eastern Tethyan Himalaya (SE Tibet): Implications for the Miocene tectonic evolution of the NE Himalaya.TECTONOPHYSICS,493(1-2).
MLA	Antolin, Borja,et al."Paleomagnetic evidence for clockwise rotation and tilting in the eastern Tethyan Himalaya (SE Tibet): Implications for the Miocene tectonic evolution of the NE Himalaya".TECTONOPHYSICS 493.1-2(2010).