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Mineralogy of the Koktokay No.3 pegmatite,Altai,NW China:implications for evolution and melt–fluid processes of rare-metal pegmatites

Mineralogy of the Koktokay No.3 pegmatite,Altai,NW China:imp...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： QIFENG ZHOU KEZHANG QIN DONGMEI TANG CHUNLONG WANG YE TIAN PATRICK ASAMOAH SAKYI Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Xinjiang Research Center for Mineral Resource Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth Science University of Ghana

The Koktokay No.3 pegmatite is the largest Li-Be-Nb-Ta-Cs pegmatitic rare-metal deposit of the Chinese Altai orogenic belt,and is famous for its concentric ring zonation pattern(nine internal zones)and rare-metal *** this paper,we present the results of major and trace element analysis for garnet,tourmaline,and beryl from the outer to inner zones of the No.3 *** previous studies on tourmaline and beryl,potential tracers of the degree of pegmatite evolution could be found by comparing with accepted indicators and evolutionary trends from the outer to inner zones of this *** Sc,Y,Li,Ta contents and Y/Ho value of garnet,together with the Ti,Ca,Na,Pb,Bi and REE contents of tourmaline,and the Fe,Ga and Rb concentrations of beryl could be possible tracers of the degree of evolution of *** textures and internal structures(homogeneity,oscillatory pattern,heterogeneous rims,replacement structures)of minerals in the pegmatite suggest that the rock underwent(1)rapid undercooling and crystallization after emplacement,resulting in the formation of an unidirectional solidification texture(UST),and then(2)became relatively stable,forming coarse crystals in outer zones,and finally(3)experienced disequilibrium crystallization,leading to the formation of complex internal structures of minerals in the inner zones,mainly caused by exsolution of more fluid and the formation of immiscible melts with different alkali *** evolutionary trend and the internal structures of tourmaline and beryl indicate that the formation of the Koktokay No.3 pegmatite was controlled mainly by fractional *** convex tetrad effect,nonCHARAC Y/Ho values,and extreme Eu depletion of garnet suggest that immiscibility,which is a significant mechanism during the formation of the No.3 pegmatite,occurred during *** differences in composition and internal structures of the minerals between the outer and inner zones of the No.3 pegmatite suggest

关键词： garnet tourmaline beryl EMPA LA-ICP-MS fractional crystallisation melt-fluid process Koktokay No 3 pegmatite Altai

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