气候变化领域集成服务门户(CCPortal): Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet

CCPortal

DOI	10.1080/00206814.2013.818750
	Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet
	Wang, Shifeng; Mo, Yasi; Phillips, Richard J.; Wang, Chao
通讯作者	Wang, SF (通讯作者)
发表日期	2014
ISSN	0020-6814
EISSN	1938-2839
起始页码	15
结束页码	28
卷号	56 期号:1
英文摘要	The role of the Karakoram fault (KKF) in evolution of the Tibetan-Himalayan orogenic belt is controversial. Some consider the KKF to be a stable, long-lived feature with several hundred kilometres of offset along its entire current trace, whereas others interpret it as having propagated along its NW-SE trend since initiation at approximate to 16Ma with small-scale slip being gradually absorbed by transfer structures along the fault trace. Here we report new zircon U-Pb and mica Ar-40/Ar-39 ages related to the Ayi Shan detachment to better constrain the activity of the KKF in southwestern Tibet. The zircon U-Pb data show migmatite ages of 489, 478, and 435Ma from the footwall of the Ayi Shan detachment involved in the KKF ductile shear zone. Mylonitized migmatite in the South Ayilari did not record any KKF activity. Similarly aged magmatic and metamorphic information recorded in mylonites and undeformed rocks of the Animaqing Group around the North Ayilari also rules out the effect of KKF movement on zircon growth. Cenozoic information recorded in North Ayilari zircons evidently resulted from Trans-Himalayan magmatic belt (THB) magmatism during 45-50Ma and 32-25Ma. Four mica dates from the same mylonitized samples all cluster around 12Ma. Combined zircon U-Pb and mica Ar-40/Ar-39 ages from the mylonites and undeformed rocks support the hypothesis that the KKF imposed a structural fabric on the rocks of the Animaqing Group and the THB granites at around 12Ma in the Ayilari Range. Chronologic, kinematic, and geometric studies demonstrate that the fault propagated southeastward into SW Tibet at 12Ma.
关键词	LARGE-SCALE GEOMETRY ASIA SUTURE ZONE U-PB TECTONIC EVOLUTION SOUTHWEST TIBET STRUCTURAL EVOLUTION DEFORMATION HISTORY KINEMATIC EVOLUTION SOUTHERN TIBET WESTERN TIBET
英文关键词	Karakoram fault; Ayi Shan detachment; Animaqing Group; mylonitized migmatite; U-Pb age; Ar-40; Ar-39 age
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000325197600002
来源期刊	INTERNATIONAL GEOLOGY REVIEW
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/258354
推荐引用方式 GB/T 7714	Wang, Shifeng,Mo, Yasi,Phillips, Richard J.,et al. Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet[J]. 中国科学院青藏高原研究所,2014,56(1).
APA	Wang, Shifeng,Mo, Yasi,Phillips, Richard J.,&Wang, Chao.(2014).Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet.INTERNATIONAL GEOLOGY REVIEW,56(1).
MLA	Wang, Shifeng,et al."Karakoram fault activity defined by temporal constraints on the Ayi Shan detachment, SW Tibet".INTERNATIONAL GEOLOGY REVIEW 56.1(2014).