Pressure-temperature Evolution of the Metapelites in the Motuo Area, the Eastern Himalayan Syntaxis

doi:10.1111/1755-6724.12213

	Pressure-temperature Evolution of the Metapelites in the Motuo Area, the Eastern Himalayan Syntaxis
	Dong Hanwen 3; Xu Zhiqin ; Li Yuan ; Liu Zhao 1
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2014
卷号	88 期号:2 页码:544-557
关键词	metamorphic rocks P-T path Motuo area the Eastern Himalayan Syntaxis
ISSN号	1000-9515
DOI	10.1111/1755-6724.12213
英文摘要	The Motuo area is located in the east of the Eastern Himalayan Syntaxis. There outcrops a sequence of high-grade metamorphic rocks, such as metapelites. Petrology and mineralogy data suggest that these rocks have experienced three stages of metamorphism. The prograde metamorphic mineral assemblages (M-1) are mineral inclusions (biotite + plagioclase + quartz +/- sillimanite +/- Fe-Ti oxides) preserved in garnet porphyroblasts, and the peak metamorphic assemblages (M-2) are represented by garnet with the lowest X-Sps values and the lowest X-Fe# ratios and the matrix minerals (plagioclase + quartz +/- K-feldspar + biotite + muscovite + kyanite +/- sillimanite), whereas the retrograde assemblages (M-3) are composed of biotite + plagioclase + quartz symplectites rimming the garnet porphyroblasts. Thermobarometric computation shows that the metamorphic conditions are 562-714 degrees C at 7.3-7.4 kbar for the M-1 stage, 661-800 degrees C at 9.4-11.6 kbar for the M-2 stage, and 579-713 degrees C at 5.5-6.6 kbar for the M-3 stage. These rocks are deciphered to have undergone metamorphism characterized by clockwise P-T paths involving nearly isothermal decompression (ITD) segments, which is inferred to be related to the collision of the India and Eurasia plates.
学科主题	变质岩岩石学
WOS关键词	BENEATH SOUTHERN TIBET ; NAMCHE BARWA SYNTAXIS ; NORTH CHINA CRATON ; TECTONIC IMPLICATIONS ; METAMORPHIC EVOLUTION ; CONTINENTAL COLLISION ; GEOLOGIC EVOLUTION ; GRANULITES ; PETROLOGY ; SUBDUCTION
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000335451300012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40497]
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, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 2.China Univ Geosci, Beijing 100083, Peoples R China 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Dong Hanwen,Xu Zhiqin,Li Yuan,et al. Pressure-temperature Evolution of the Metapelites in the Motuo Area, the Eastern Himalayan Syntaxis[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2014,88(2):544-557.
APA	Dong Hanwen,Xu Zhiqin,Li Yuan,&Liu Zhao.(2014).Pressure-temperature Evolution of the Metapelites in the Motuo Area, the Eastern Himalayan Syntaxis.ACTA GEOLOGICA SINICA-ENGLISH EDITION,88(2),544-557.
MLA	Dong Hanwen,et al."Pressure-temperature Evolution of the Metapelites in the Motuo Area, the Eastern Himalayan Syntaxis".ACTA GEOLOGICA SINICA-ENGLISH EDITION 88.2(2014):544-557.