Problems of the origin, ore-bearing and evolution of rare-metal granitoids

Details Problems of the origin, ore-bearing and evolution of rare-metal granitoids Problems of the origin, ore-bearing and evolution of rare-metal granitoids

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...35...51k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 35, Issue 1-3, p. 51-62.

Physics

7

Scientific paper

On the basis of detailed geological, petrographic, geochemical (including isotopic and partition coefficient evidence) and experimental (phase relationships in the systems granite-H2O-HF, ongonite-H2O-HF, quartz-albite-orthoclase-F-H2O, data on melt and fluid inclusions in minerals) studies, it has been shown that rare-metal Li-F granites and ongonites were formed at the latest stages of crystallization differentiation of a granitic magma with a somewhat increased fluorine content. At the end of the process of crystallization differentiation, as a result of the build-up of water in residual magma, emanation differentiation (metamagmatism) may play a significant role. Parental magma of rare-metal Li-F granites, with a somewhat increased fluorine content, may have been formed either owing to crystallization differentiation of a common sialic granitic melt or owing to the anatexis of rare-metal metasomatites in continental crust environments.

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