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Recognition and significance of multiple fluid inclusion generations in telogenetic calcites

Published online by Cambridge University Press:  05 July 2018

Philippe Muchez  and
Marek Slobodnik
Philippe Muchez
Affiliation:
Fysico-chemische geologie, K.U.Leuven, Celestijnenlaan 200C, B-3001 Leuven, Belgium
Marek Slobodnik
Affiliation:
Fysico-chemische geologie, K.U.Leuven, Celestijnenlaan 200C, B-3001 Leuven, Belgium Department of Geology and Paleontology, Masaryk University, Kotlarska 2, 61137 Brno, Czech Republic
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Abstract

Ferroan and non-ferroan calcites occur in fractures in the Lower Carboniferous of the Variscan foreland of southern Belgium. These fractures post-date the Variscan orogeny and the calcites have a telogenetic origin. The non-ferroan calcites formed by recrystallization of the ferroan calcites. Two types of monophase aqueous fluid inclusions are present in the ferroan calcite cement. Although both types of inclusions formed at a temperature not exceeding 50°C, one type contains a moderately saline fluid (3.6–16.3 eq. wt.% NaCl) and the other type fresh water (Tm ice = 0°C). The fluid inclusions in the non-ferroan calcite also contain fresh water.

Detailed petrography of the fluid inclusions indicate that the fresh water migrated through the crystals along opened cleavage planes and microfractures. Therefore, they have a secondary origin. The recrystallization of the ferroan calcites to non-ferroan calcites occurred in this fresh water. The saline fluid inclusions are not related to the above mentioned microstructures and although their origin remains unknown, they could represent the ambient fluid from which the ferroan calcites precipitated. The study of the relationship between the occurrence of fluid inclusions and the microstructures seems promising for the identification of fluid inclusions representing post mineral formation fluid and temperature conditions in calcite cements.

Keywords

telogenetic calcitesfluid inclusionsfresh watercleavage planesmicrofractures
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 402 , October 1996 , pp. 813 - 819
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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