geothermobarometry of al2sio5-bearing metapelites in the ardara aureole, nw ireland: an implication for p-t stability field of aluminium silicate polymorphs
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abstract
andalusite, kyanite and sillimanite occur in well-defined zones in the ardara aureole, nwireland. temperature and pressure conditions of the al2sio5-bearing pelites in this aureole wereestimated using ten different calibrations of garnet-biotite thermometry and five calibrations of garnetplagioclase-al2sio5-quartz barometry. the different calibrations provide different estimates oftemperature and pressure. however, using the most recent, and the best reversed experimental data givetemperatures varying from 510 to 605 ºc, and a pressure of around 4 kbar across the ardara aureole. thecalculated temperatures for the analyzed samples are compared with published andalusite=sillimaniteequilibria, and these equilibria are evaluated in the ardara aureole.
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Journal title:
iranian journal of science and technology (sciences)ISSN 1028-6276
volume 29
issue 1 2005
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