Abstract
A study is made of a complex where the metamorphis zonation with respect to pressure does not coincide with the temperature zonation. The possibility of estimating the P-T conditions of metamorphism is shown on the basis of quantitative statistical characteristics in the distribution of critical minerals, combined with data on the bulk rock chemistry. An example is also given of metamorphic zonation in which a general trend of decreasing pressure is observed in the direction of increasing temperature. Based on schematic P-T diagrams for quartz and muscovite-bearing metapelites the conditions of metamorphism in the middle-temperature region can be examined in detail and the best ways of subdividing corresponding facies into subfacies can be determined. Results are presented concerning the dependence of the compositions of a number of minerals of common parageneses on pressure. Criteria are suggested for the estimation of conditions of metamorphism based on the chemical characteristics garnets and biotites.
Published Version
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