On alkaline magmatic rocks
Abstract
The author dwells on the issue of the differentiation of the primary planetary magma (see the article). Besides the factors that operated and determined magmatic differentiation during the period of the planet's cooling and solidification, other factors subsequently came into play, continuing the work of their predecessors. These factors must be recognized as water and the atmosphere after their appearance on Earth. These agents continued to differentiate the rocks, separating bases and acids and concentrating them in individual locations, for example, depositing thick strata of limestones, quartz sandstones, alkali chlorides, and other compounds. These concentrated bases and acids, when reabsorbed by the magma, were possibly the cause of the disruption of homogeneity and the excessive enrichment in bases, which gave rise to the appearance of basic rocks, both alkaline and alkaline-earth. Adopting such a viewpoint, we can, starting from a single primary magma, for example, a granitic magma, explain all the diversity of magmas that have given rise to the magmatic rocks exposed on the Earth's surface, with which we are gradually becoming acquainted.
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References
- Prof. A. I. Vvedensky. Logic as a Part of the Theory of Knowledge, p. 94.
- H. Rosenbusch. Mikroskopische Physiographie der massigen Gesteine. Band II, p. 71. 1907.
- H. Rosenbusch. Elemente der Gesteinslehre. 1910. § 124.
- F. Loewinson-Lessing. On the Fundamental Problems of Petrogenesis. Izv. SPb. Polytechn. Inst. 1910, Vol. XII. (in Russian)