气候变化领域集成服务门户(CCPortal): Metamorphic P-T paths of metapelitic granulites from the Larsemann Hills, East Antarctica

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DOI	10.1016/j.lithos.2014.01.013
	Metamorphic P-T paths of metapelitic granulites from the Larsemann Hills, East Antarctica
	Tong, Laixi; Liu, Xiaohan; Wang, Yanbin; Liang, Xirong
通讯作者	Tong, LX (通讯作者)
发表日期	2014
ISSN	0024-4937
EISSN	1872-6143
起始页码	102
结束页码	115
卷号	192
英文摘要	Through detailed textural observations, a peak M1 assemblage garnet + orthopyroxene + cordierite + K-feldspar has been identified in a structurally early Al-rich metapelitic granulite lens from the Larsemann Hills, East Antarctica. The M1 assemblage has been overprinted by M2 cordierite corona and M3 orthopyroxene + cordierite symplectite on garnet grains. Quantitative modeling for the peak M1 assemblage via the THERMOCALC program in the KFMASH system suggests that it was formed by the crossing of the univariant reaction garnet + biotite =cordierite + orthopyroxene + K-feldspar+ melt under P-T conditions of 6-8 kbar and 840-880 degrees C, followed by post-peak near isobaric cooling. However, the average P-T calculations for the boron-bearing pelitic granulite indicate that peak M1 conditions reached similar to 9.0 kbar and similar to 900 degrees C, and the overprinting M2 assemblage formed under P-T conditions of similar to 7.0 kbar and 800-850 degrees C, reflecting a post-peak near isothermal decompression. P-T estimates show that M3 conditions reached 4-5 kbar and 700-750 degrees C. These imply that the M1 metamorphic evolution of the region displays contrasting P-T paths, while M2 to M3 evolution indicates a decompression-cooling process. The available chronological data support that the M1 metamorphic evolution occurred during the late Proterozoic (1000-900 Ma) Grenvillian high-grade compression tectonic event (D1), and was accompanied by strong magmatism, showing a close affinity to the northern Prince Charles Mountains and the Rayner complex. However, the overprinted M2 to M3 metamorphic evolution formed during the early Palaeozoic (similar to 530 Ma) Pan-African high-grade tectonic events (D2-D3), and was associated with an important intracontinental reworking. This study presents an example for interpreting a complex polymetamorphic history. (C) 2014 Elsevier B.V. All rights reserved.
关键词	PRINCE-CHARLES MOUNTAINS PRYDZ-BAY RAUER GROUP BRATTSTRAND BLUFFS FACIES PARAGNEISS SOSTRENE ISLAND FINAL SUTURE U-PB GARNET CONSTRAINTS
英文关键词	Metamorphic P-T paths; Metapelitic granulites; Larsemann Hills; East Antarctica
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000335102100007
来源期刊	LITHOS
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/258300
推荐引用方式 GB/T 7714	Tong, Laixi,Liu, Xiaohan,Wang, Yanbin,et al. Metamorphic P-T paths of metapelitic granulites from the Larsemann Hills, East Antarctica[J]. 中国科学院青藏高原研究所,2014,192.
APA	Tong, Laixi,Liu, Xiaohan,Wang, Yanbin,&Liang, Xirong.(2014).Metamorphic P-T paths of metapelitic granulites from the Larsemann Hills, East Antarctica.LITHOS,192.
MLA	Tong, Laixi,et al."Metamorphic P-T paths of metapelitic granulites from the Larsemann Hills, East Antarctica".LITHOS 192(2014).