• 责任者：Wang Baodi (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Wang Liquan
• 刊名：Acta Petrologica Sinica
• 出版年：2011
• 卷期：27(9)
• 关键词：花岗质片麻岩 ; granitic gneiss ; 岩石地球化学 ; lithogeochemistry ; 铪同位素 ; hafnium isotopes ; 澜沧江 ; Lancang River
• 页码：p.2752-2762
• 图表：6 illus., 3 tables, 41 refs.
• 分类号：0802
• 出版序号：1676
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

A suit of granitic gneiss was recognized in the Jitang rock group from Leiwuqi area in the East Tibet. Cameca U-Pb zircon analyses suggest that the granitic gneiss was dated at (246.3±0.8) Ma, suggesting the metamorphic granite was formed in the Early Triassic. The features suggest that the granitic gneiss is similar to collision type granite. The Leiwuqi granitic gneiss was most likely formed at post-collision setting in the Lancangjiang belt. They were probably generated by highly fractional crystallization of parent magma, which mixing with melts from remelting of ancient crust materials induced by mantle-derive magma underplating and mantle-derive magma melts, product of collisional orogenesis. The results indicate that magmatic growth in Lancangjiang suture during Early Triassic, and had entered a continental collision stage by the Early Triassic (~ 246 Ma) in the Leiwuqi area of the eastern Tibet.