气候变化领域集成服务门户(CCPortal): Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan

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DOI	10.1029/2021GC010193
	Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan
	Zhang, Dingding; Ding, Lin; Chen, Yi; Schertl, Hans-Peter; Qasim, Muhammad; Jadoon, Umair Khan; Wang, Houqi; Li, Jinxiang; Zhang, Liyun; Yue, Yahui; Xie, Jing
通讯作者	Ding, L (通讯作者)
发表日期	2022
EISSN	1525-2027
卷号	23 期号:2
英文摘要	In Western Himalayan Syntaxis, the India-Asia continental collision occurred at ca. 50 Ma, while its uplift history and exhumation mechanism are still in dispute despite decades of studies. A new type of eclogite was found in Naran, located ca. 30 km southwest of the Upper Kaghan Valley. Phase equilibrium calculations and thermobarometer performed on the Naran eclogite documented the peak-P metamorphic condition of 720-780 degrees C at 2.4-2.8 GPa. Two further exhumation stages were identified with the first one at high-P granulite-facies conditions of 750-800 degrees C at 1.6-1.9 GPa, and the second at amphibolite-facies conditions of 550-630 degrees C at 0.5-0.8 GPa. SIMS U-Pb dating of metamorphic zircons yielded an age of 46 +/- 2 Ma, which is interpreted to constrain the high-P metamorphism age along the northwestern margin of the Indian plate. SIMS U-Pb dating of rutile yielded a cooling age of 26 +/- 3 Ma, which is interpreted as cooling age in the amphibolite facies. The average speculated exhumation rate of the Naran massif (similar to 3 mm a(-1)) was much lower than that recovered from the Upper Kaghan Valley massif (86-143 mm a(-1)). The tectonic and metamorphic evolution of the whole Western Himalayan Syntaxis shows the difference in temporal and spatial change within the Paleogene era, indicating the inconsistent exhumation histories of the continental slices. Such a multi-slice exhumation process was probably related to the closure of the Neo-Tethys ocean and the break-off of the Indian lithospheric slab.
关键词	MINERAL EQUILIBRIA CALCULATIONS HIGH-PRESSURE METAMORPHISM PARTIAL MELTING EQUILIBRIA FORELAND BASIN EVOLUTION MAIN MANTLE THRUST ZIRCON U-PB TECTONIC EVOLUTION KAGHAN VALLEY ROCK EXHUMATION SOUTHERN TIBET
英文关键词	UHP; eclogite; metamorphism; U-Pb dating; exhumation; western Himalayan syntaxis
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000765651700011
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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/260710
推荐引用方式 GB/T 7714	Zhang, Dingding,Ding, Lin,Chen, Yi,et al. Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan[J]. 中国科学院青藏高原研究所,2022,23(2).
APA	Zhang, Dingding.,Ding, Lin.,Chen, Yi.,Schertl, Hans-Peter.,Qasim, Muhammad.,...&Xie, Jing.(2022).Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,23(2).
MLA	Zhang, Dingding,et al."Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 23.2(2022).