Recognition and significance of multiple fluid inclusion generations in telogenetic calcites

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Authors:Muchez, Philippe; Slobodnik, Marek
Author Affiliations:Primary:
K.U. Leuven, Fysico-chemische, Louvain, Belgium
Other:
Masaryk University, Czech Republic
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 60(5), p.813-819. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1996
Note:In English. 20 refs.; illus., incl. geol. sketch map
Summary: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 flesh water. Detailed petrography of the fluid inclusions indicate that the flesh 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.
Subjects:Calcite; Carbonates; Carboniferous; Fluid inclusions; Inclusions; P-T conditions; Paleozoic; Petrography; Belgium; Europe; Western Europe; Southern Belgium
Abstract Numbers:97M/866
Record ID:1997017966
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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