Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications

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	Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications
	Qi, XX (Qi XueXiang); Zhao, YH (Zhao YuHao); Zhu, LH (Zhu LuHua); Li, ZQ (Li ZhiQun)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:6 特刊 SI 页码:1846-1856
关键词	High-pressure pelitic granulite High-pressure/-temperature metamorphism Continental collision Ailaoshan orogenic belt
ISSN号	1000-0569
英文摘要	High-pressure pelitic granulite containing porphyroblasts of garnet (Grt), sillimanite (Sil), K-feldspar (Kf) and plagioclase (Pl), and inclusions of spinel (Spl), kyanite (Ky), sapphirine (Spr) and rutile (Rut) have been found from the Ailaoshan orogenic belt, southeastern Tibet, regarded as a key indicator for identification of the boundary between the Indochina and South China blocks. The temperatures and pressures calculated by garnet-biotite-plagioclase-quartz geothermobarometery and high-temperature equilibrium spinal + quartz assemblage show the formation and evolution of the graunlite had experienced clockwise P-T path from high-pressure/-temperature to mid-temperature and low-pressure metamorphism. That are 1) the high-pressure/-temperature metamorphism (HP/HT) is characterized by an assemblage of Ky + Sil + Grt(1) + Kf(1) + Pl(1) + Spr + Ter(Kf + Pl) + Bt(1) + Spl + Qtz + Ilm(1) + Rut(1), and the peak P-T conditions of >= 10.4kbar at 850 similar to 919 degrees C; 2) the mid-temperature and low-pressure retrogressive metamorphism characterized by an assemblage of Grt(2) + Bt(2) + Pl(2) + Ms + Qtz + Ilm(2) + Rut(2), and two stage P-T conditions of 4.9 similar to 6.5kbar at 664 similar to 754 degrees C and 3.5 similar to 3.9kbar at 572 similar to 576 degrees C respectively. The dynamic metamorphic path was that the metapelitic rock experienced high-pressure/-temperature granulite-facies metamorphism in lower continental crust (>= 30km) exhumated to mid-upper crust rapidly, it might be related to the continental collision and underthrusting between the Indochina and South China blocks, and exhumation and slip shearing lately.
学科主题	变质岩岩石学
WOS关键词	SHAN-RED RIVER ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; SOUTHERN INDIA IMPLICATIONS ; SHEAR ZONE ; NORTHERN VIETNAM ; SOUTHWEST CHINA ; COLLISION ZONE ; KONTUM MASSIF ; STRIKE-SLIP ; EVOLUTION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000305817000010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39636]
专题	中国地质调查局
作者单位	Yunnan Bur Nonferrous Geol, Kunming 650051, Peoples R China
推荐引用方式 GB/T 7714	Qi, XX ,Zhao, YH ,Zhu, LH ,et al. Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications[J]. ACTA PETROLOGICA SINICA,2012,28(6 特刊 SI):1846-1856.
APA	Qi, XX ,Zhao, YH ,Zhu, LH ,&Li, ZQ .(2012).Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications.ACTA PETROLOGICA SINICA,28(6 特刊 SI),1846-1856.
MLA	Qi, XX ,et al."Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications".ACTA PETROLOGICA SINICA 28.6 特刊 SI(2012):1846-1856.