Metamorphic P-T path and tectonic implications of pelitic granulites from the Daqingshan Complex of the Khondalite Belt, North China Craton

doi:10.1016/j.precamres.2013.11.012

	Metamorphic P-T path and tectonic implications of pelitic granulites from the Daqingshan Complex of the Khondalite Belt, North China Craton
	Cai, Jia 2; Liu, Fulai ; Liu, Pinghua ; Liu, Chaohui ; Wang, Fang ; Shi, Jianrong
刊名	PRECAMBRIAN RESEARCH
	2014
卷号	241 页码:161-184
关键词	Pelitic granulite Phase equilibria modeling P-T path The Khondalite Belt Western Block North China Craton
ISSN号	0301-9268
DOI	10.1016/j.precamres.2013.11.012
英文摘要	Pelitic granulites are cropped out in the Daqingshan Complex of the Khondalite Belt, a Paleoproterozoic tectonic belt in the Western Block of the North China Craton. Petrological studies show that these granulites contain four distinct metamorphic assemblages. The core of a garnet porphyroblast, along with fine-grained inclusions of biotite + plagioclase + K-feldspar + quartz +/- sillimanite +/- ilmenite, defines the prograde metamorphic (M-1) stage. The peak (M-2) assemblage consists of garnet (mantle) + biotite + K-feldspar + plagioclase + quartz +/- sillimanite +/- ortbopyroxene +/- ilmenite +/- magnetite +/- rutile. Peak metamorphism was followed by a near-isothermal decompression (M-3) and the development of coronae of garnet + biotite + cordierite + plagioclase + quartz +/- K-feldspar +/- sillimanite +/- spinel ilmenite +/- magnetite (M-3) in the Crd-Grt-Bt gneisses during the following garnet breakdown reactions: garnet + sillimanite + melt -> cordierite + biotite + Fe-oxide and garnet + melt -> biotite + quartz + plagioclase. Retrograde cooling (M-4) assemblages are represented by biotite + muscovite + sillimanite + quartz + plagioclase + K-feldspar +/- ilmenite. Quantitative phase equilibria modeling in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3 was applied to obtain P-T conditions of <780 degrees C and <9 kbar for M-1, 840-880 degrees C and 9-11 kbar for M-2, 800-870 degrees C and 5.0-7.5 kbar for M-3, and <660 degrees C and 4.1-6.9 kbar for M-4. The combination of the mineral assemblages, mineral compositions, and metamorphic reaction histories in the Daqingshan pelitic granulites defines a clockwise P-T path that involves periods of near-isothermal decompression and late cooling that followed the peak granulite-facies metamorphism. This result is consistent with the tectonic history of the Daqingshan Complex in the Khondalite Belt, which involved continent-continent subduction and collision followed by exhumation and cooling. This suggests a continent-continent collisional event between the Yinshan and Ordos blocks, which became amalgamated to form the Paleoproterozoic Khondalite Belt in the Western Block of the North China Craton. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	HIGH-PRESSURE GRANULITES ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; MINERAL EQUILIBRIA CALCULATIONS ; CALCULATED PHASE-EQUILIBRIA ; PARTIAL MELTING EQUILIBRIA ; U-PB ; WESTERN BLOCK ; ZIRCON GEOCHRONOLOGY ; JINING COMPLEX ; METAPELITIC GRANULITES
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000331427500010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40488]
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, Beijing 100037, Peoples R China 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Cai, Jia,Liu, Fulai,Liu, Pinghua,et al. Metamorphic P-T path and tectonic implications of pelitic granulites from the Daqingshan Complex of the Khondalite Belt, North China Craton[J]. PRECAMBRIAN RESEARCH,2014,241:161-184.
APA	Cai, Jia,Liu, Fulai,Liu, Pinghua,Liu, Chaohui,Wang, Fang,&Shi, Jianrong.(2014).Metamorphic P-T path and tectonic implications of pelitic granulites from the Daqingshan Complex of the Khondalite Belt, North China Craton.PRECAMBRIAN RESEARCH,241,161-184.
MLA	Cai, Jia,et al."Metamorphic P-T path and tectonic implications of pelitic granulites from the Daqingshan Complex of the Khondalite Belt, North China Craton".PRECAMBRIAN RESEARCH 241(2014):161-184.