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Mineralogical Magazine; August 2003; v. 67; no. 4; p. 653-663; DOI: 10.1180/0026461036740124
© 2003 Mineralogical Society of Great Britain and Ireland
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Pyrometamorphic breakdown of cordierite–muscovite intergrowths

R. H. Grapes*

Institut für Mineralogie, Petrologie und Geochemie, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany

* E-mail: rodney.grapes{at}minpet.uni-freiburg.de

Backscattered electron imaging of cordierite-muscovite intergrowths near the margin of a schist xenolith in trachytic tephra of the Wehr Volcano, East Eifel area, Germany, show that they have undergone disequilibrium melting to form spinel + biotite + sillimanite/?mullite + peraluminous melt. Textures indicate that in the initial stage of reaction, spinel, biotite and sillimanite/?mullite formed with melt produced in cordierite and spinel + ?mullite with melt after muscovite, providing evidence of two different reaction pathways. Fe-Mg distributions between biotite/spinel, cordierite/spinel, cordierite/ biotite suggest a melting temperature of ~770°C, implying overstepping of various calculated and experimentally determined mineral breakdown curves of between 30 and 170°C during short-term heating before the xenolith was quenched on eruption.

KEYWORDS: pyrometamorphism, cordierite, muscovite, Wehr volcano, Germany






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