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	Metamorphism evolution of mafic granulite from the Larsemann Hills, East Antarctica.
	Zhou Xin; Tong LaiXi; Liu XiaoHan; Wang YanBin; Chen YiBing
通讯作者	Zhou, X (通讯作者)
发表日期	2014
ISSN	1000-0569
EISSN	2095-8927
起始页码	1731
结束页码	1747
卷号	30 期号:6
英文摘要	The Larsemann Hills are located in the central part of the Prydz tectonic belt in East Antarctica. The study of granulite metamorphism of this area is essential to understanding the tectonic nature of the Prydz belt. The petrographic study of the garnet-bearing mafic granulite boulder collected from the region demonstrates that pre-peak prograde mineral assemblage (M1) consists of hb + opx +/- cpx + pl + bi + ilm +/- q +/- mt, and peak metamorphic assemblage ( M2) comprises g + opx + cpx + hb + +/- ilm mt +/- q, whereas the symplectite opx + pl + hi + ilm mt represents a superimposed assemblage ( M3) associated with a decompression event. Mineral chemistry shows that garnets and orthopyroxenes in the mafic granulite have weak compositional zonings. Through the use of THERMOCALC program, the thermodynamic modeling in the NCFMASHTO system has been undertaken for the mafic granulite. Combined with conventional thermobarometers and the average P-T estimates, P-T' conditions of the different metamorphic stages are estimated as 650 similar to 750 degrees C/5.5 similar to 6.5kb ( M1), 850 similar to 950 degrees C/8 similar to 8.5kb ( M2), and 800 similar to 900 degrees C/5. 5 similar to 6. 5kb ( M3), respectively. Its metamorphism evolution of the mafic granulite is a typical post-peak isothermal decompression ( ITD) clockwise P-T path. Compared with the mafic granulites in this region, we argue that this sample may originate from basement in Larsemann Hills. Combined with available chronological data in the region, it is suggested that the peak metamorphism likely corresponds to the Greenville high-grade tectonism, whereas post-peak retrograde metamorphism may be related to the Pan-African high-grade tectonism, implying that the Pan-African Prydz belt could be an intracontinental mobile belt.
关键词	MINERAL EQUILIBRIA CALCULATIONS TEMPERATURE-TIME PATHS NORTH CHINA CRATON PRYDZ-BAY GROVE MOUNTAINS RAUER GROUP METAPELITIC GRANULITES GARNET THERMOMETER REACTION TEXTURES MORB GLASSES
英文关键词	Mafic granulite; Phase equilibrium modeling; P-T path; Tectonic significance; Larsemann Hills; East Antarctica
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000338487400015
来源期刊	ACTA PETROLOGICA SINICA
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/258325
推荐引用方式 GB/T 7714	Zhou Xin,Tong LaiXi,Liu XiaoHan,et al. Metamorphism evolution of mafic granulite from the Larsemann Hills, East Antarctica.[J]. 中国科学院青藏高原研究所,2014,30(6).
APA	Zhou Xin,Tong LaiXi,Liu XiaoHan,Wang YanBin,&Chen YiBing.(2014).Metamorphism evolution of mafic granulite from the Larsemann Hills, East Antarctica..ACTA PETROLOGICA SINICA,30(6).
MLA	Zhou Xin,et al."Metamorphism evolution of mafic granulite from the Larsemann Hills, East Antarctica.".ACTA PETROLOGICA SINICA 30.6(2014).