Abstract
The paper presents the results of a study of desilicated rocks of the middle crust at the level of amphibolite facies using the example of corundum-bearing plagioclasites developing over the metabasites at the unique Khitostrov mineral deposit in the Belomorian-Lapland orogen of the Fennoscandian Shield. The main attention is paid to new geological data, documentation and analysis of metasomatic zoning, determination of the P-T conditions of its formation, and a model of the metasomatic process.
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