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Metamorphic P–T conditions and retrograde path of high-pressure Barrovian metamorphic zones near Cairn Leuchan, Caledonian orogen, Scotland

Published online by Cambridge University Press:  13 August 2013

K. AOKI ,
B. F. WINDLEY ,
S. MARUYAMA  and
S. OMORI
K. AOKI*
Affiliation:
Department of Earth Science and Astronomy, The University of Tokyo, Tokyo 153-8902, Japan
B. F. WINDLEY
Affiliation:
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
S. MARUYAMA
Affiliation:
Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan
S. OMORI
Affiliation:
Department of Liberal Arts, The Open University of Japan, Chiba 261-8586, Japan
*
†Author for correspondence: [email protected]
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Abstract

The metamorphic P–T conditions and associated relationships of the Barrovian zones near Glen Muick were re-examined by focusing on the petrology and thermodynamics of rocks at Cairn Leuchan, where garnetite lenses and layers occur in surrounding garnet amphibolite in the highest-grade sillimanite zone. The representative mineral assemblages in the garnet-rich lenses and garnet amphibolite are garnet + quartz + clinopyroxene + plagioclase + amphibole ± epidote, and garnet + amphibole + quartz + plagioclase ± clinopyroxene ± epidote, respectively. The chemical compositions of constituent minerals are the same in both garnetite and garnet amphibolite. The metamorphic P–T conditions of these rocks were estimated by thermodynamic calculations. The results show that the rocks underwent high-pressure granulite facies metamorphism at P = c. 1.2–1.4 GPa and T = c. 770–800°C followed by amphibolite facies metamorphism at P = c. 0.5–0.8 GPa and T = c. 580–700°C. Integration of our new results with previously published data suggests that the retrograde P–T trajectory of the highest-grade Barrovian metamorphic rocks marks a temperature decrease during decompression from a crustal depth of the high-pressure granulite facies, which is much deeper than previously considered.

Keywords

Barrovian zonespseudosectionP–T conditionretrograde path
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 3 , May 2014 , pp. 559 - 571
Copyright
Copyright © Cambridge University Press 2013 

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