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Ore mineralization of Proterozoic rocks from the lower volcanic formations in the SG-3 section and their homologues in the near-surface zone
Abstract. Inclusions in zircon of magmatic and metamorphic genesis from biotite-plagioclase gneiss in SG-3 Archaean unit VIII have been studied. A criterion of magmatic zircon genesis is the presence of melted inclusions in them, the study of which allows determining the composition and evolution of the primary melts. The study of the inclusion composition showed that crystallization of plagiorhyodacitic melts started with formation of micro grains of potassium-bearing plagioclase (Ab61, An26, and Or13) and titanomagnetite. At the same stage zircon grains were likely to be formed. Some of them trapped liquid СО2 inclusions and syngenetic melted inclusions. The presence of such inclusions points to crystallization of early zircon from СО2-saturated magmas at P ~3.5 kbar. During metamorphism of plagiogneiss protoliths, isometric crystals of zircon cut in a complicated manner were formed. They contained primary inclusions of chloride solutions similar to those in plagioclase and quartz from plagiogneiss. The fluid pressure, assessed by inclusions of water solutions and СО2 rich inclusions in the zircons under study, reached 2.8-4.0 kbar at Т = 540-620°С.
Printed reference: Yakovlev Yu.N., Skufin P.K. Ore mineralization of Proterozoic rocks from the lower volcanic formations in the SG-3 section and their homologues in the near-surface zone // Vestnik of MSTU. 2007. V. 10, No 1. P. -.
Electronic reference: Yakovlev Yu.N., Skufin P.K. Ore mineralization of Proterozoic rocks from the lower volcanic formations in the SG-3 section and their homologues in the near-surface zone // Vestnik of MSTU. 2007. V. 10, No 1. P. -. URL: http://vestnik.mstu.edu.ru/v10_1_n26/articles/07_yakov.pdf.
