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Pressure-temperature dependent compositional variation of phlogopitic micas in upper mantle peridotites

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Abstract

Compositional variation of phlogopitic micas in upper mantle peridotites is reviewed. Phlogopitic micas in garnet peridotites are systematically lower in Al (or eastonite component) than those in spinel peridotites. The core of phlogopite megacryst and phenocryst of kimberlite is always lower in Al than the rim. It is apparent that Al/(Al + Si) ratio or eastonite component in phlogopitic micas in ultramafic rocks is controlled by the equilibrium pressure and temperature. In the upper mantle peridotites containing garnet or spinel, the Al/(Al + Si) ratio of phlogopitic mica decreases with increasing pressure at constant temperature. Phlogopitic mica is a potential thermo-barometer in both garnet- and spinel-peridotite facies.

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  1. Institute of Geoscience, University of Tsukuba, 305, Ibaraki, Japan

    Shoji Arai

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  1. Shoji Arai
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Arai, S. Pressure-temperature dependent compositional variation of phlogopitic micas in upper mantle peridotites. Contr. Mineral. and Petrol. 87, 260–264 (1984). https://doi.org/10.1007/BF00373059

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  • DOI: https://doi.org/10.1007/BF00373059

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