Geologica Belgica

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Stijn DEWAELE, Ariël BOVEN, Tom THYS & Philippe MUCHEZ

Timing of veining and Variscan deformation in the Stavelot-Venn Massif (Belgium)

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Abstract

Petrographic investigation of the Grand-Halleux boreholes identified different generations of quartz veins that were formed during different periods of fluid migration in an environment that was decreasingly influenced by compressive deformation. The 40Ar-39Ar dating of muscovite associated with shear zones crosscutting two quartz vein generations indicated an age of 318 ± 4.7 Ma, which allows determining the position of the different vein generations in relation to the Variscan deformation in the Stavelot-Venn Massif. This age also determines the approximate age for the Variscan syn-orogenic metamorphism in the Stavelot-Venn Massif.

Younger extension veins and prismatic quartz crystals in open spaces are associated with different generations of carbonates, associated with Pb-Zn-Cu mineralisation. This implies that this mineralisation did not form during Caledonian metamorphism or early Variscan orogenic metamorphism, but has a late to post-Variscan age. It could be linked to the post-orogenic expulsion of metamorphic fluids, but a link with the younger Pb-Zn mineralisation in the Variscan front zone is favoured based on the presence of high-salinity low temperature fluids.  

Keywords : Grand-Halleux, Ar-Ar age dating, Stavelot-Venn Massif, Pb-Zn-Cu mineralisation, paragenesis

To cite this article

Stijn DEWAELE, Ariël BOVEN, Tom THYS & Philippe MUCHEZ, «Timing of veining and Variscan deformation in the Stavelot-Venn Massif (Belgium)», Geologica Belgica [En ligne], volume 17 (2014), number 3-4, 244-251 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=4624.

About: Stijn DEWAELE

Department of Geology and Mineralogy, Royal Museum for Central Africa, Leuvensesteenweg 13, B-3080 Tervuren, Belgium

About: Ariël BOVEN

Department of Geology and Mineralogy, Royal Museum for Central Africa, Leuvensesteenweg 13, B-3080 Tervuren, Belgium

About: Tom THYS

Geodynamics & Geofluids Research Group, Katholieke Universiteit Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium

About: Philippe MUCHEZ

Geodynamics & Geofluids Research Group, Katholieke Universiteit Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium