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《Acta Mineralogica Sinica》 2011-03
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LA-ICPMS U-Pb Zircon Geochronology of the Altai Pegmatites and Its Geological Significance

REN Bao-qin1,2 ZHANG Hui1,TANG Yong1,LU Zheng-hang1,2(1.Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
In this paper,we report new LA-ICPMS U-Pb zircon ages for 19 pegmatite veins in the Altai area,NW China.According to zircon ages,the pegmatite can be divided into four periods:(1) Caledonian Period,about 476 Ma;(2) late Hercynian period,260-280 Ma;(3) Indosinian Period,205-250 Ma;(4) Yanshan Period,180-200 Ma.Our results suggest that the Altai pegmatites were mainly formed in Permian and Trias-Jurassic.And Indosinian is an important rare-metal mineralization epoch in the Altay area.After early Permian( 280 Ma),the regional tectonic regime changed from compressional to extensional.Pegmatite formation is controlled by the extensional regime.
【Fund】: 国家重点基础研究发展计划“973”项目(编号:2007CB411303;2006CB403508);; 国家科技部支撑计划“305”项目(编号:2007BAB25B01);; 国家自然科学基金面上项目(批准号:40673052)
【CateGory Index】: P597.3
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