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GEOTHERMOBAROMETRY OF Al2SiO5-BEARING METAPELITES IN THE ARDARA AUREOLE, NW IRELAND: AN IMPLICATION FOR P-T STABILITY FIELD OF ALUMINIUM SILICATE POLYMORPHS | ||
| Iranian Journal of Science | ||
| مقاله 17، دوره 29، شماره 1، اردیبهشت 2005، صفحه 163-179 اصل مقاله (870.34 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijsts.2005.2794 | ||
| نویسنده | ||
| S. M. HOMAM* | ||
| Faculty of Earth Sciences, Damghan University of Sciences, Cheshmeh-Ali Road, Damghan, I. R. of Iran. | ||
| چکیده | ||
| Andalusite, kyanite and sillimanite occur in well-defined zones in the Ardara aureole, NW Ireland. Temperature and pressure conditions of the Al2SiO5-bearing pelites in this aureole were estimated using ten different calibrations of garnet-biotite thermometry and five calibrations of garnetplagioclase- Al2SiO5-quartz barometry. The different calibrations provide different estimates of temperature and pressure. However, using the most recent, and the best reversed experimental data give temperatures varying from 510 to 605 ºC, and a pressure of around 4 kbar across the Ardara aureole. The calculated temperatures for the analyzed samples are compared with published andalusite=sillimanite equilibria, and these equilibria are evaluated in the Ardara aureole. | ||
| کلیدواژهها | ||
| Aluminium silicate polymorphs؛ geothermobarometry؛ metapelite؛ aureole؛ ardara | ||
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