New aspects and considerations on the assimilation of Cordierite-bearing rocks
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Universidad de Salamanca
info
ISSN: 0214-2708
Year of publication: 1988
Volume: 1
Issue: 1-2
Pages: 129-133
Type: Article
More publications in: Revista de la Sociedad Geológica de España
Abstract
The presence of cordieritites (rocks with high percentages of cordierite and probably restitic in origin) as enclaves in cordierite-bearing biotite granitic rocks is an important point in favour of a xenogenic origin for this mineral and a basic feature in an alternative hypothesis of the interpretation of cordierite-bearing granites as of S (s.s.) origin. It is concluded that the assimilation of restitic rocks (cordieritites and possible similar rocks: garnet cordieritites and garnetites) may account for the presence of these minerals (and also of andalusite and sillimanite) in igneous rocks (intrusives and equivalent effusives, originally independent of anatectic processes affecting metasedimentary rocks) that thus acquire an S appearance.