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Grandidierite from aluminous metasedimentary xenoliths within acid volcanics, a first record in Italy

Published online by Cambridge University Press:  05 July 2018

Manfred J. van Bergen
Manfred J. van Bergen*
Affiliation:
Department of Structural and Applied Geology, Geological Institute, State University of Utrecht, Budapestlaan 4, Utrecht, the Netherlands
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Summary

Grandidierite has been identified in two aluminous metasedimentary xenoliths from quartz-latitic volcanic rocks from Mt. Amiata and Mt. Cimino, central Italy. Physical and electron microprobe data for the grandidierites and petrological data for the grandidierite-bearing xenoliths are presented. The grandidierites formed by a reaction involving pre-existing aluminium rich minerals, possibly at temperatures of at least 800 °C and at low pressures. The grandidierite from Mt. Amiata replaces sillimanite. Several common characteristics can be demonstrated for magmatic and metamorphic grandidierite-bearing rocks. It is suggested that metamorphic rocks in which grandidierite occurs have often undergone partial melting.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 329 , March 1980 , pp. 651 - 658
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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