喜马拉雅淡色花岗岩_吴福元要点详解.pdf

1000-0569 /2015 /031 (01)-0001-36 Acta Petrologica Sinica 岩石学报 * 喜马拉雅淡色花岗岩 吴福元 刘志超 刘小驰 纪伟强 WU FuYuan ，LIU ZhiChao ，LIU XiaoChi and JI WeiQiang 中 ， 100029 国科学院地质与地球物理研究所岩石圈演化国家重点实验室 北京 State Key Laboratory of Lithospheric Evolution ，Institute of Geology and Geophysics ，Chinese Academy of Sciences，Beijing 100029，China 2014-05-04 收稿，2014-08-27 改回. Wu FY ，Liu ZC ，Liu XC and Ji WQ. 2015. Himalayan leucogranite :Petrogenesis and implications to orogenesis and :1 － 36 plateau uplift. Acta Petrologica Sinica ，31 (1) Abstract The Himalayan orogenic belt is characterized by widespread of leucogranites which are mostly peraluminous with mafic mineral less than 5% . Two sub-parallel belts ，i. e. ，Higher Himalayan and Tethyan Himalayan ，have been recognized according to their distribution. Petrologically ，this kind of granitic rocks can be classified as three sub-groups of muscovite-，tourmaline-and garnet- bearing rocks. It was previously thought that the Himalayan leucogranite was formed during India-Asia continental collision by in situ partial melting of the Higher Himalayan paragneisses at amphibolite- to granulite-facies metamorphic conditions ，since it locates near the minimum eutectic point in the granitic Q-Ab-Or system. It was also proposed that the muscovite-granite was formed at higher temperature than those of the tourmaline- and garnet-bearing granites. However ，the detailed investigations indicate that this granite might be in fact a kind of high temperature magma ，which had undergone an intensive crystal fractionation ，and could be considered as an end-member of fractionated granites on our Earth. It is almost impossible to constrain its genetic type due to later fractional crystallization altho