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- W2160486256 abstract "WIDESPREAD VOLCANISM is characteristic of the Siberian platform, and was especially intense during uppermost Paleozoic and lower Mesozoic time. The Siberian traps, which occupy an area of more than 1,500,000 km, are best developed there. These are effusive and hypabyssal rocks of basalt-dolerite type, closely resembling trap rocks in other ' parts of the globe, especially the Karroo dolerires of South Africa. The rise of trap magma began in the upper Paleozoic ( Permian or even as early as Upper Carboniferous) time , and reached its climax in the Lower Triassic period. It was accompanied by the ejection of much pyroclastic material, which formed a thick series of tuffs. Lava sheets and hypabyssal intrusions of various kinds and sizes were formed . The process of volcanism was rather com plicated, and at present M. 1. Lurie and V. Z. Masaitis distinguish five volcanic phases and 13 separate intrusive complexes, each having its own specific features and pattern of develop ment in various parts of the platform. In spite of this, however, the magma had some charac teristic features over the entire area, notably an iron content somewhat higher than is usual and an especially rapid increase of relative iron con tent during the process of crystallization dif ferentiation. The increase of the iron content of the fernie minerals in the process of crystalliza tion prevails over the conventional reaction series of Bowen. For example, olivine of early formation contains abour 20 % fayalite, that characteristic of the usual type of traps contains about 40 % fayalite , and the iron content of olivine in pegrnatoid veins is as high as 80 %. The residue of the differentiation is as a rule micropegmatite, either in the rnesostasis, or in some cases forming veinlets of granite cornpo" @default.
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- W2160486256 date "1963-10-01" @default.
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- W2160486256 title "Characteristic Features of the Volcanism of the Siberian Platform" @default.
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