Age and origin of sillimanite schist from the Chinese Altai metamorphic belt: implications for late Palaeozoic tectonic evolution of the Central Asian Orogenic Belt

doi:10.1080/00206814.2013.841335

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	Age and origin of sillimanite schist from the Chinese Altai metamorphic belt: implications for late Palaeozoic tectonic evolution of the Central Asian Orogenic Belt
	Wang, Wei-(RZ)4; Wei, Chunjing 1; Zhang, Yinghui 1; Chu, Hang 2; Zhao, Yue ; Liu, Xiaochun
刊名	INTERNATIONAL GEOLOGY REVIEW
	2014
卷号	56 期号:2 页码:224-236
关键词	Altai sillimanite schist zircon U-Pb dating THERMOCALC heat flux
ISSN号	0020-6814
DOI	10.1080/00206814.2013.841335
英文摘要	Reconstructing late Palaeozoic metamorphism of the Central Asian Orogenic Belt (CAOB) can provide a better understanding of how the CAOB formed. The petrology of sillimanite-bearing metapelitic schists from high-grade portions of the Permian Chinese Altai metamorphic belt (andalusite-type) reflects the effects of poorly understood high-T, low-P metamorphism. Phase equilibria modelling in the Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-TiO2-O (NCKFMASHTO) system restricts P-T conditions of the sillimanite schists to approximately 635-670 degrees C at approximately 5.8-6.8 kbar. SHRIMP U-Pb analyses of zircon from the rocks yield a concordant age of 299.2 +/- 3.4 Ma. Combined with the slightly younger (292.8 +/- 2.3 Ma) areally restricted pelitic granulite with peak P-T conditions of approximately 780-800 degrees C at approximately 5-6 kbar and high-T granulite with P-T conditions of approximately 860 degrees C at approximately 6 kbar, these metamorphic rocks reflect prograde heating at relatively low pressure in early Permian time. Together with contemporary and widespread magmatic activities, they are best explained in the context of a post-orogenic extensional environment related to a mantle plume.
学科主题	变质岩岩石学
WOS关键词	ZIRCON U-PB ; EFFECTIVE BULK-COMPOSITION ; A-TYPE GRANITES ; NW CHINA ; NORTHWEST CHINA ; MINERAL EQUILIBRIA ; CRUSTAL GROWTH ; CONTINENTAL GROWTH ; CENTRAL AUSTRALIA ; SOUTH TIANSHAN
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000325519500006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40600]
专题	中国地质调查局天津地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 3.Inst Geol & Mineral Resources, Tianjin, Peoples R China 4.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Wang, Wei-,Wei, Chunjing,Zhang, Yinghui,et al. Age and origin of sillimanite schist from the Chinese Altai metamorphic belt: implications for late Palaeozoic tectonic evolution of the Central Asian Orogenic Belt[J]. INTERNATIONAL GEOLOGY REVIEW,2014,56(2):224-236.
APA	Wang, Wei-,Wei, Chunjing,Zhang, Yinghui,Chu, Hang,Zhao, Yue,&Liu, Xiaochun.(2014).Age and origin of sillimanite schist from the Chinese Altai metamorphic belt: implications for late Palaeozoic tectonic evolution of the Central Asian Orogenic Belt.INTERNATIONAL GEOLOGY REVIEW,56(2),224-236.
MLA	Wang, Wei-,et al."Age and origin of sillimanite schist from the Chinese Altai metamorphic belt: implications for late Palaeozoic tectonic evolution of the Central Asian Orogenic Belt".INTERNATIONAL GEOLOGY REVIEW 56.2(2014):224-236.