Composition and Thermochronology of Alkaline Granites of the Ingur Massif: The Problem of Detection of Factors Contributing to Formation of Rare-Metal Mineralization in Alkaline Granites of Western Transbaikalia
D. A. Lykhin, V. V. Yarmolyuk, A. A. Vorontsov, L. O. Magazina
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引用次数: 0
Abstract
The question of what factors contributed to the formation of rare metal mineralization in alkaline granites of Western Transbaikalia is considered. This work is based on the results of comparison of petro-geochemical characteristics of alkaline granitoids from the nearby ore-bearing Ingur and ore-free Sherbakhtinskii massifs. The rocks of these massifs form a common series of compositions with variations from syenites to alkaline granites (in the Sherbakhtinskii massif) and from alkaline granites to pegmatites (in the Ingur massif). The formation of this series of rocks is associated with a deep differentiation of the original magma common to both massifs, accompanied by a sequential decrease in the magnesium content and the accumulation of rare elements (Be, Ta, Nb, Th, U, HREEs) in residual melts. They reach the highest values in the pegmatites of the Ingur massif, in which rare metal mineralization appears. Its formation is associated with the fact that, according to the thermochronological studies, the Ingur massif was located in the temperature range from 900 to 500°C for 6 Ma. Such a long stay in the region of high temperatures was accompanied not only by deep differentiation of residual melts, but also stimulated fluid activity, which contributed to the redistribution and accumulation of ore elements in pegmatites.
期刊介绍：
Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.
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