CRITERIA OF RELATIVE DEPTHS AND RELATED PORPHYRACEOUS ANALOGS

E. M. Kozhakhmetov

1992

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DOI 10.2113/rgg.1992.33.3.129
Data confidence 70 medium
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Abstract

Based on analysis of composition of magmatic inclusions and contents of Fe3+ impurity in alkaline feldspars of granites and ongonite rocks from Kazakhstan, critertia of relative depths have been proposed. By comparing oxidation degree of granites from a single complex, the relative depths of their origin can be defined. According to oxidation degree of a magmatic fluid, phenocrysts in porphyraceous analogs of granites are subdivided into deep-seated (intratelluric) and near-surface phases.