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UDC (551.243:552.16):(550.93+550.84)(574.4) THE NATURE OF SUBSTANCE OF METAMORPHIC ROCKS AND GRANITOIDS OF THE CHECHEK DOME STRUCTURE (IRTISH ZONE OF SHEARING)
I. A. Savinsky, V. G. Vladimirov, P. D. Kotler
The paper provides correlation of the composition of migmatites and granite gneisses within the Chechek dome structure to the composition of sedimentary rocks at the margins of the Irtysh zone of shearing. The analysis of geology of the area has shown that the sedimentary strata of the Takyr and Kystav-Kuchum formations were the primary substance for metamorphic rocks and granitoids. Besides, it was previously discovered that the basic melts of the Surovsky gabbro massif, which had been forming at 312 Ma, were a heat source of metamorphism and granite formation. It has been found that the material composition of the Chechek dome rocks corresponds to the silty-sandy deposits of the Takyr Formation, whereas refractory diatexites and amphibolitic gneisses could correspond to limy horizons of the Takyr Formation or the Kystav-Kuchum Formation deposits. As a result, the Chechek dome structure rocks were formed in situ directly in the Irtysh zone of shearing.
Key words: geochemistry, substance, magmatism, metamorphism, granite formation, zone of shearing, the Irtysh zone of shearing, dome structure, East Kazakhstan.
DOI 10.20403/2078-0575-2016-2-126-134
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