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Formation of late Miocene silicic volcanic rocks in the central Tibetan Plateau by crustal anatexis of granulites

文献类型：期刊论文

作者Ou, Quan3,5; Wang, Qiang2,3,4; Wyman, Derek A.1; Zhang, Xiu-Zheng3,4; Hao, Lu-Lu3,4; Zeng, Ji-Peng3; Yang, Jin-Hui6; Zhang, Hai-Xiang3; Hou, Ming-Cai5; Qi, Yue3
刊名LITHOS
出版日期2022-12-01
卷号432页码:12
ISSN号0024-4937
关键词Late Miocene Trachydacite Granulite Peritectic reaction Tibetan Plateau
DOI10.1016/j.lithos.2022.106882
英文摘要Partial melting of granulites generates melts, which causes the modification of continental crust. However, the detailed mechanisms of this partial melting and related magmatic processes are debated. In this study, we investigated how crustal melting of granulites generated late Miocene (ca. 6.0 Ma) silicic volcanic rocks in the Chibuzhangcuo area of the Qiangtang Block, Tibet. Various peritectic textures (e.g., quartz inclusions in clino-pyroxene and fluorhydroxyl phlogopite) suggest that the pyroxenes were derived from a residual granulite phase and peritectic reactions, and were then entrained into the partial melts. The F-rich mica, granulite mineral as-semblages, and high titanomagnetite-ilmenite (811-975 degrees C) and zircon saturation (836-867 degrees C) temperatures indicate the silicic magmas were high-temperature and water-poor. The geochemical and isotopic compositions of the silicic volcanic rocks are similar to those of middle-lower crustal intermediate-mafic granulite xenoliths in Cenozoic volcanic rocks in the Qiangtang Block. We suggest that these volcanic rocks were generated by partial melting of hydrous mineral-bearing granulites, triggered by an underlying thermal anomaly associated with the high crustal heat-flow of the central Tibetan Plateau. This work indicates that the occurrence of restitic hydrous mineral and perturbation of thermal anomaly are the primary conditions to cause the partial melting of granulite. As the melting went on, the residual granulite phase and peritectic minerals were likely to be preferentially entrained into the melt due to the erosion effect caused by the continued melt flow at the sites of melting.
WOS关键词U-PB ; CONTINENTAL-CRUST ; PERITECTIC GARNET ; ZIRCON GEOCHRONOLOGY ; GRANITE ; CONSTRAINTS ; ENCLAVES ; BENEATH ; RESTITE ; ORIGIN
资助项目National Natural Science Foundation of China[42021002] ; National Natural Science Foundation of China[91855215] ; National Natural Science Foundation of China[41802057] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000870985300001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/107755]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Qiang; Zhang, Xiu-Zheng
作者单位1.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
2.Univ Chinese Acad Sci, Beijing 10069, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
4.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
5.Chengdu Univ Technol, Inst Sedimentary Geol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ou, Quan,Wang, Qiang,Wyman, Derek A.,et al. Formation of late Miocene silicic volcanic rocks in the central Tibetan Plateau by crustal anatexis of granulites[J]. LITHOS,2022,432:12.
APA Ou, Quan.,Wang, Qiang.,Wyman, Derek A..,Zhang, Xiu-Zheng.,Hao, Lu-Lu.,...&Liu, Zhao.(2022).Formation of late Miocene silicic volcanic rocks in the central Tibetan Plateau by crustal anatexis of granulites.LITHOS,432,12.
MLA Ou, Quan,et al."Formation of late Miocene silicic volcanic rocks in the central Tibetan Plateau by crustal anatexis of granulites".LITHOS 432(2022):12.

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来源：地质与地球物理研究所

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