Contributions to Mineralogy and Petrology

, Volume 87, Issue 3, pp 260–264 | Cite as

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

  • Shoji Arai


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.


Constant Temperature Mineral Resource Compositional Variation Ultramafic Rock Equilibrium Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Shoji Arai
    • 1
  1. 1.Institute of GeoscienceUniversity of TsukubaIbarakiJapan

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