Genesis of the metamorphic rock from southeastern Lhasa terrane and the Mesozoic-Cenozoic orogenesis

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	Genesis of the metamorphic rock from southeastern Lhasa terrane and the Mesozoic-Cenozoic orogenesis
	Dong, X (Dong Xin); Zhang, ZM (Zhang ZeMing); Liu, F (Liu Feng); Wang, W (Wang Wei); Yu, F (Yu Fei); Lin, YH (Lin YanHao); Jiang, HY (Jiang HongYing); He, ZY (He ZhenYu)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:6 特刊 SI 页码:1765-1784
关键词	Lhasa terrane High-grade metamorphic rock Multi-metamorphism Mesozoic-Cenozoic Compound orogeny
ISSN号	1000-0569
英文摘要	This work researched the petrology and chronology of the metamorphic rocks distributed in the Nyingchi region from the southeastern segment of Lhasa terrane, Qinghai-Tibet Plateau. Our study indicates this suit of metamorphic rocks experienced three-stage metamorphism during Mesozoic-Cenozoic, and formed three metamorphic belts. Firstly, Mainling belt experienced peak high temperature (HT) and medium pressure (MP) granulite-facies metamorphism, then amphibolite-facies retrograde metamorphism. The temperature and pressure conditions of the peak granulite-facies metamorphism are 830 similar to 900 degrees C and 0.9 similar to 1.3GPa. And the time of metamorphism is the Late Cretaceous of 89 similar to 81Ma. Secondly, Bayi belt generally experienced low pressure (LP) amphibolite-facies metamorphism, of which the time is Eocene of 55 similar to 49Ma. And the temperature and pressure conditions are 625 similar to 679 degrees C and 0.4 similar to 0.55GPa. Thirdly, Bujiu belt experienced MP amphibolite-facies metamorphism, of which the time is Oligocene of 36 similar to 26Ma. And the temperature and pressure conditions are 615 similar to 663 degrees C and 0.5 similar to 0.8GPa. This study demonstrates that the protoliths of these metamorphic rocks is mainly composed of the Late Paleozoic sedimentary rocks and the Paleozoic to Cenozoic magmatic rocks. Moreover, the material sources of the metasedimentary rocks have the records of the tectono-thermal events related to the Grenville and Pan-African orogenesis, indicating a tectonic affinity to Gondwana supercontinent. We consider that the Late Cretaceous HT and MP metamorphism related to the Andean-type orogeny derived from the subduction of Neo-Tethyan oceanic lithosphere, the Eocene LP amphibolite-facies metamorphism formed during the collision orogeny between Indian and Eurasian continents and then the deep-subduction slab's break-off of Neo-Tethyan, and the Oligocene MP amphibolite-facies metamorphism resulted from the crustal thickening caused by the subduction between India and Eurasia continents. Therefore, the high-grade metamorphic rocks located on the southeastern segment of Lhasa terrane not only reveals the middle and lower crust composition, but also the tectonic evolution for the hanging wall of the subduction/collision compound orogenic belt.
学科主题	构造地质学
WOS关键词	ZIRCON U-PB ; EASTERN HIMALAYAN SYNTAXIS ; HIGH-PRESSURE GRANULITES ; BENEATH SOUTHERN TIBET ; CONTINENTAL COLLISION ; ISOTOPIC COMPOSITIONS ; GANGDESE BATHOLITH ; TECTONIC EVOLUTION ; TRACE-ELEMENTS ; LOWER CRUST
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000305817000006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39720]
专题	中国地质调查局
作者单位	China Univ Geosci, Fac Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Dong, X ,Zhang, ZM ,Liu, F ,et al. Genesis of the metamorphic rock from southeastern Lhasa terrane and the Mesozoic-Cenozoic orogenesis[J]. ACTA PETROLOGICA SINICA,2012,28(6 特刊 SI):1765-1784.
APA	Dong, X .,Zhang, ZM .,Liu, F .,Wang, W .,Yu, F .,...&He, ZY .(2012).Genesis of the metamorphic rock from southeastern Lhasa terrane and the Mesozoic-Cenozoic orogenesis.ACTA PETROLOGICA SINICA,28(6 特刊 SI),1765-1784.
MLA	Dong, X ,et al."Genesis of the metamorphic rock from southeastern Lhasa terrane and the Mesozoic-Cenozoic orogenesis".ACTA PETROLOGICA SINICA 28.6 特刊 SI(2012):1765-1784.