L’or et de ses minéraux accompagnateurs sur le pourtour du massif cambro-ordovicien de Serpont, Belgique

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Marco E. Ciriotti
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L’or et de ses minéraux accompagnateurs sur le pourtour du massif cambro-ordovicien de Serpont, Belgique

Messaggio da Marco E. Ciriotti » gio 12 ott, 2017 14:30

Referenza
▪ Bruni, Y. & Hatert, F. (2017): Étude minéralogique de l’or et de ses minéraux accompagnateurs sur le pourtour du massif cambro-ordovicien de Serpont, Belgique. Bulletin de la Société Royale des Sciences de Liège, 86, 67-122.

Abstract:
The Serpont Massif is a small Cambro-Ordovician Massif located in the centre of the Luxembourg province, between the cities of Libramont-Chevigny, Bras and Libin, in the South East of Belgium. The Massif is covered by many water streams mainly situated in the surrounding of Lochkovian conglomerate of the “Fépin Formation”.
Alluvial gold is dispersed with an appearance of grains and specks, most often in a "modified" form, containing sometimes quartz inclusions. Chemical analyses detected contents of silver below 7 wt%, except for a grain corresponding to electrum; traces of copper and iron were also observed. All these elements are distributed homogeneously in each grain. The origin of gold is probably related to the formation of veins, mostly set up during the Variscan metamorphic event (500 °C and 300-400 MPa) in a “shear zone” context, and its release from the lower Devonian conglomerates of the “Fépin Formation” by erosion. These events seem similar to those that occur in the Stavelot Massif in Belgium. Heavy alluvial minerals associated with gold are garnet (almandine - spessartine – grossular typical of Ardennes), magnetite, tourmaline (schorl - dravite), zircon, chloritoid, ilmenite, rutile and pyrite.
Marco E. Ciriotti

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