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Open AccessArticle

Phlogopite-Forming Reactions as Indicators of Metasomatism in the Lithospheric Mantle

D.S. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, Academician Ossipyan str., 4, Chernogolovka, Moscow region 142432, Russia
Geological Department, Lomonosov Moscow State University, Vorob’evy Gory, Moscow 119899, Russia
Department of Geology, University of Johannesburg, Auckland Park, Johannesburg 2006, South Africa
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 685;
Received: 4 October 2019 / Revised: 29 October 2019 / Accepted: 2 November 2019 / Published: 6 November 2019
Phlogopite is widely accepted as a major mineral indicator of the modal metasomatism in the upper mantle within a very wide P–T range. The paper reviews data on various phlogopite-forming reactions in upper-mantle peridotites. The review includes both descriptions of naturally occurring reactions and results of experiments that model some of these reactions. Relations of phlogopite with other potassic phases, such as K-richterite, sanidine and K-titanates, are discussed. These data are taken as a basis for thermodynamic modeling of the phlogopite-forming reactions for specific mantle rocks in terms of log(aH2O) − log(aK2O) diagrams (pseudosections) using the Gibbs free energy minimization. These diagrams allow estimation of potassium-water activity relations during metasomatic transformations of mantle rocks, prediction sequences of mineral assemblages with respect to these parameters and comparison of metasomatic processes in the rocks of different composition. This approach is illustrated by examples from peridotite xenoliths from kimberlites. View Full-Text
Keywords: upper mantle; phlogopite; mantle metasomatism; fluid; peridotite upper mantle; phlogopite; mantle metasomatism; fluid; peridotite
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MDPI and ACS Style

Safonov, O.; Butvina, V.; Limanov, E. Phlogopite-Forming Reactions as Indicators of Metasomatism in the Lithospheric Mantle. Minerals 2019, 9, 685.

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