Precambrian high-pressure metamorphism of the Northern Lhasa Terrane,;Tibet and its tectonic implications

	Precambrian high-pressure metamorphism of the Northern Lhasa Terrane,;Tibet and its tectonic implications
	Yan Rong 3; Zhang ZeMing ; Dong Xin ; Lin YanHao 1; Liu Feng 1
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:1949-1961
关键词	HP granulite Northern Lhasa Terrane P-T path Oceanic subduction
ISSN号	1000-0569
英文摘要	High-pressure (HP) mafic granulite is characterized by the key assemblage garnet-clinopyroxene-plagioclase-quartz, and it is one of the best carriers to study oceanic or continental crust subduction-collision. The HP mafic granulite occurs as the tectonic block in the Early Paleozoic sedimentary strata of the northern Lhasa terrane. The protolith of the HP granulite is a gabbro, which experienced four-stage metamorphism: early amphibolite-facies (0.9 similar to 1.0GPa, 710 similar to 720 degrees C), the peak HP granulite-facies (1.55 similar to 1.65 GPa, 730 similar to 740 degrees C), granulite-facies (similar to 0.82GPa, similar to 821 degrees C) and later amphibolite-facies (0.60 similar to 0.68GPa, 520 similar to 540 degrees C), respectively. The clockwise metamorphic P-T path includes an early prograde process of isobaric decreasing temperature and subsequent isothermal distinctly increasing pressure, and a retrograde process with early slightly heating and decompression and subsequent late decreasing of temperature and pressure, indicating that the HP mafic granulite formed in the high geothermal gradient and experienced heating retrograde process. Therefore, the formation of HP mafic granulite may not be related to the typical oceanic subduction, rather mid-ocean ridge subduction and mantle plume are possible control factors in its genesis.
学科主题	变质岩岩石学
WOS关键词	MINERAL EQUILIBRIA CALCULATIONS ; SYSTEM ; K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 ; SUBDUCTION ZONE ; OROGENIC BELT ; SOUTH TIBET ; MADAGASCAR ; ASSEMBLAGES ; CONSTRAINTS ; EVOLUTION ; PETROLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40080]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.China Univ Geosci, Grad Sch, Wuhan 430074, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Yan Rong,Zhang ZeMing,Dong Xin,et al. Precambrian high-pressure metamorphism of the Northern Lhasa Terrane,;Tibet and its tectonic implications[J]. ACTA PETROLOGICA SINICA,2013,29(6):1949-1961.
APA	Yan Rong,Zhang ZeMing,Dong Xin,Lin YanHao,&Liu Feng.(2013).Precambrian high-pressure metamorphism of the Northern Lhasa Terrane,;Tibet and its tectonic implications.ACTA PETROLOGICA SINICA,29(6),1949-1961.
MLA	Yan Rong,et al."Precambrian high-pressure metamorphism of the Northern Lhasa Terrane,;Tibet and its tectonic implications".ACTA PETROLOGICA SINICA 29.6(2013):1949-1961.