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UHT sapphirine granulite metamorphism at 1.93-1.92 Ga caused by gabbronorite intrusions: Implications for tectonic evolution of the northern margin of the North China Craton

文献类型：期刊论文

作者Guo, JingHui1; Peng, Peng1; Chen, Yi1; Jiao, ShuJuan1; Windley, Brian F.2
刊名PRECAMBRIAN RESEARCH
出版日期2012-12-01
卷号222页码:124-142
关键词Sapphirine granulite Ultrahigh-temperature (UHT) metamorphism P-T path Palaeoproterozoic Khondalite belt North China Craton
ISSN号0301-9268
DOI10.1016/j.precamres.2011.07.020
文献子类Article
英文摘要Sapphirine granulites occur in the Daqingshan and Jining areas in the Palaeoproterozoic Khondalite belt, which divides the Western Block of the North China Craton into the Yinshan block to the north and the Ordos block to the south. The sapphirine granulites in the Daqingshan area are always in contact with meta-gabbronorite dykes, implying a causal relationship. The sapphirine-bearing rocks are divided into spinel-garnet-sillimanite-biotite-plagioclase-sapphirine gneiss, UHT sapphirine granulite, and spinel-garnet granulite. The sapphirine granulite contains up to 30% sapphirine, garnet (30-50%), spinel (5-15%), sillimanite (5-15%), biotite (10-20%) and plagioclase (10-20%) with minor cordierite, rutile and ilmenite, but without quartz and orthopyroxene. Bulk chemical compositions show that the sapphirine granulites have very low SiO2 contents (39 wt.%), high Al contents, and low X-Mg. Biotite contains very high TiO2 contents up to 7.6 wt.%. Detailed petrographic examination of the sapphirine granulites reveals five mineral assemblages (M-0-M-4): (1) an assemblage (M-0) of mineral inclusions within garnet cores, (2) a matrix (peak) assemblage (M-1) represented by coarse-grained garnet, sapphirine, spinel, sillimanite, biotite and plagioclase, (3) sapphirine + plagioclase symplectite (M-2), (4) spinel + plagioclase symplectite (M-3), and (5) retrogressive biotite (M-4). The P-T stability field in the pseudosection of the NCKFMASH system indicates that the temperature of the peak UHT metamorphism of the Daqingshan sapphirine granulites is in the range 910-980 degrees C (this compares with the peak regional metamorphic temperature of the khondalites of 700-820 degrees C). The P-T path inferred from the P-T stability fields of the mineral assemblages (M-1-M-4) suggests that the peak UHT metamorphism (M-1) was followed by nearly isothermal decompression (M-2 and M-3) and later cooling (M-4). Field relations and geochronological data suggest that the high-heat flow necessary for the UHT metamorphism of the sapphirine granulites from the Daqingshan area was provided by coeval similar to 1.93-1.92 Ga gabbronorite intrusions that were most probably generated by ridge subduction, which was also responsible for abundant garnet-rich granites by crust melting the area. (c) 2011 Elsevier B.V. All rights reserved.
WOS关键词ULTRAHIGH-TEMPERATURE METAMORPHISM ; PB ZIRCON GEOCHRONOLOGY ; HIGH-PRESSURE GRANULITES ; CALCULATED PHASE-EQUILIBRIA ; BEARING MINERAL ASSEMBLAGES ; WUTAI-FUPING COMPLEXES ; U-PB ; CRUSTAL METAMORPHISM ; KHONDALITE BELT ; WESTERN BLOCK
WOS研究方向Geology
语种英语
WOS记录号WOS:000313765700006
出版者ELSEVIER SCIENCE BV
资助机构Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; 40372089) ; 40372089) ; 40372089) ; 40372089) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; 40372089) ; 40372089) ; 40372089) ; 40372089) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; 40372089) ; 40372089) ; 40372089) ; 40372089) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; 40372089) ; 40372089) ; 40372089) ; 40372089)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84072]  
专题中国科学院地质与地球物理研究所
通讯作者Guo, JingHui
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
推荐引用方式
GB/T 7714		 Guo, JingHui,Peng, Peng,Chen, Yi,et al. UHT sapphirine granulite metamorphism at 1.93-1.92 Ga caused by gabbronorite intrusions: Implications for tectonic evolution of the northern margin of the North China Craton[J]. PRECAMBRIAN RESEARCH,2012,222:124-142.
APA Guo, JingHui,Peng, Peng,Chen, Yi,Jiao, ShuJuan,&Windley, Brian F..(2012).UHT sapphirine granulite metamorphism at 1.93-1.92 Ga caused by gabbronorite intrusions: Implications for tectonic evolution of the northern margin of the North China Craton.PRECAMBRIAN RESEARCH,222,124-142.
MLA Guo, JingHui,et al."UHT sapphirine granulite metamorphism at 1.93-1.92 Ga caused by gabbronorite intrusions: Implications for tectonic evolution of the northern margin of the North China Craton".PRECAMBRIAN RESEARCH 222(2012):124-142.

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来源：地质与地球物理研究所

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