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Pressure-temperature conditions of the Ryoke metamorphic rocks in Yanai district, SW Japan

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Abstract

Pressure-temperature conditions of metamorphism in the Yanai district, Ryoke belt, SW Japan, have been determined using garnet-biotite thermometry in combination with an empirically calibrated barometer in the assemblage common in pelitic and siliceous rocks, garnet + biotite + plagioclase + quartz. The barometer estimates pressure difference between a well-established sample and unknown samples based on the reaction,

$$ {\text{pyrope}}\; + \;{\text{grossular}}\; + \;{\text{eastonite}}\; + \;{\text{quartz}}\; = \;{\text{phlogopite}}\; + \;{\text{anorthite}} $$

Pressure and pressure gradient increased with increasing temperature such that pressures of high-grade areas exceeded that of the triple point of aluminosilicates. The thermobaric structure of the study area shows that pressure increased up to 5 kbar with southward increase in metamorphic temperature up to the highest-grade area, the garnet-cordierite zone. Further south, pressure was almost the same as that of the garnet-cordierite zone and temperature decreased. This asymmetric distribution of metamorphic conditions on both sides of the garnet-cordierite zone can explain the asymmetric distribution of metamorphic zones; the K-feldspar-cordierite zone and sillimanite-K-feldspar zone on the north and south sides of the garnet-cordierite zone, respectively. The breakdown reaction of muscovite and quartz defines the beginning of both the K-feldspar-cordierite zone and sillimanite-K-feldspar zone, which took place under low and high pressures, respectively. These thermobaric structures suggest that temperature varied laterally at mid-crustal level during the peak of metamorphism.

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Acknowledgements

I am grateful to S. Banno and T. Nishiyama for critical reading of the manuscript and valued comments. Thanks are also due to M. Brown and J. Ferry for constructive reviews and T. L. Grove for editorial works. This study was financially supported by Grants-in-Aid for Scientific Research (C) (14540451) from the Japan Society for the Promotion of Science.

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  1. Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 33 Hakozaki, 812–8581, Fukuoka, Japan

    Takeshi Ikeda

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Correspondence to Takeshi Ikeda.

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Editorial Responsibility: T.L. Grove

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Ikeda, T. Pressure-temperature conditions of the Ryoke metamorphic rocks in Yanai district, SW Japan. Contrib Mineral Petrol 146, 577–589 (2004). https://doi.org/10.1007/s00410-003-0521-7

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