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ZHONG Yun, XIA Bin, LIU Wei-liang, XIA Lian-ze, XIA Zhong-Yu, WANG Li-hong. 2013: LA-ICP-MS zircon U-Pb age and genesis of Longbucun granite in Southern Gangdise Belt, Tibet. Geological Bulletin of China, 32(9): 1362-1370. DOI: 10.12097/gbc.20130905
Citation: ZHONG Yun, XIA Bin, LIU Wei-liang, XIA Lian-ze, XIA Zhong-Yu, WANG Li-hong. 2013: LA-ICP-MS zircon U-Pb age and genesis of Longbucun granite in Southern Gangdise Belt, Tibet. Geological Bulletin of China, 32(9): 1362-1370. DOI: 10.12097/gbc.20130905
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LA-ICP-MS zircon U-Pb age and genesis of Longbucun granite in Southern Gangdise Belt, Tibet

  • Guangdong University Key Labaratory of Offshore Oil Exploration and Development, School of Marine Science, Sun Yat-sen University, Guangzhou 510275, Guangdong, China; 2. Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, Guangdong, China;3. Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, Guangdong, China

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  • Granite has important significance for the study of ocean plate subduction and continent-continent collision under certain conditions. Longbucun granite belongs to the middle part of Southern Gangdise Belt, and the formation age of the granitoids in this belt is a subject of much controversy. The LA-ICP-MS U-Pb zircon age of Longbucun granite is 157.0Ma±2.9Ma, which shows that there existed granitic magmation in the Late Jurassic in Southern Gangdise Belt. Longbucun granite is enriched in such large-ion lithophile elements as Rb, Ba, Th, U and K and depleted in the high field strength elements like Nb, Ta and Ti, suggesting the features of island arc magmatic rocks and indicating that there existed an early-stage northward subduction of the Neo-Tethys Ocean to the Eurasian Plate in the Late Jurassic period. Longbucun granite was formed by partial melting of the mantle wedge under the subduction of the Neo-Tethys plate.
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