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Transformación de andalucita a sillimanita en granitos peralumínicos del batolito de los Montes de Toledo: implicaciones petrogenéticas

Impacto



Merino Martínez, Enrique y Villaseca González, Carlos y Pérez-Soba Aguilar, Cecilia y López García, José Ángel (2008) Transformación de andalucita a sillimanita en granitos peralumínicos del batolito de los Montes de Toledo: implicaciones petrogenéticas. Geogaceta, 44 . pp. 35-38. ISSN 0213-683X

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Resumen

The Montes de Toledo Batholith comprises several felsic peraluminous granitic plutons characterized by
the presence of two Al2SiO5 polymorphous: andalusite and sillimanite (as fibrolitic variety). Textural features
indicate an igneous origin for andalusite, variably replaced by muscovite and fibrolite around it. We propose
a combination of factors to explain this probable magmatic reaction: the decrease in minor element
contents of andalusite (Fe, Mg, Mn, Ti) and the increase of volatiles in the melt (B, P, F, H2O) along its
cooling. This chemical variation influences the stability of both polymorphs, crystallizing initially igneous
andalusite and, when the Fe content decreases, the sillimanite, in relation with muscovite, in a restricted
P-T space close to the granite solidus conditions.


Tipo de documento:Artículo
Palabras clave:Peraluminous granites, Aluminum silicate stability, Mineral chemistry, Iberian Hercynian Belt
Materias:Ciencias > Geología > Petrología
Código ID:12386
Depositado:09 Mar 2011 13:30
Última Modificación:06 Feb 2014 09:23

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