Original paper

HRTEM study of the chloritization of micas in the talc-chlorite deposit at Trimouns (Pyrenees, France)

Parseval, Philippe De; Amouric, Marc; Baronnet, Alain; Fortune, Jean-Pol; Moine, Bernard; Ferret, Jocelyne

European Journal of Mineralogy Volume 6 Number 1 (1994), p. 123 - 132

14 references

published: Feb 4, 1994
manuscript accepted: Oct 14, 1993
manuscript received: Feb 12, 1993

DOI: 10.1127/ejm/6/1/0123

BibTeX file

ArtNo. ESP147050601012, Price: 29.00 €

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Abstract We have studied by high-resolution transmission electron microscopy (HRTEM) four rock samples resulting from the metasomatic alteration of pegmatite in the Trimouns talc-chlorite deposit. Two co-existing ways of mica chloritization can be distinguished: dissolution-recrystallization for muscovites and phlogopites, and "solid-state" transformation for other phlogopites. The latter occurs according to the two transformation mechanisms usually described in chloritization phenomena. Chemical microanalyses reveal the presence of potassium, probably associated with the "brucite-like" layer, in chlorites resulting directly from the transformation of micas. Little or none of this potassium is found in the later-formed chlorites constituting the ore, it is therefore considered as a probable geochemical tracer of older micas


chloritephlogopitemuscovitetransformation mechanismhigh-resolution transmission electron microscopy