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TRANSFORMATION SEQUENCES OF COPPER SULFIDES AT VIELSALM, STAVELOT MASSIF, BELGIUM

Frédéric Hatert

Laboratoire de Minéralogie, Université de Liège, Bâtiment B18, B–4000 Liège, Belgium

E-mail address: fhatert{at}ulg.ac.be

Bornite, chalcopyrite, idaite, covellite, yarrowite, spionkopite, anilite, digenite, djurleite, and chalcocite have been identified in quartz veins from the Vielsalm area, Stavelot Massif, Belgium. The identification of these copper sulfides is confirmed by electron-microprobe analyses. The association of primary sulfides indicates that the bornite-bearing quartz veins crystallized above 300–350°C, whereas the chalcocite-bearing quartz veins crystallized below 200°C. Relations among sulfides indicate the occurrence of two sequences of transformation, responsible of the formation of secondary sulfides: chalcocite-H chalcocite-M djurleite low digenite or (anilite + djurleite) yarrowite + spionkopite covellite + oxidation minerals, and bornite idaite + chalcopyrite covellite + oxidation minerals. The crystallization of chalcocite-M, djurleite, and low digenite or (anilite + djurleite) took place between 103.5 and 72°C. The associations idaite + chalcopyrite, yarrowite + spionkopite, and covellite + oxidation minerals, were produced under meteoric conditions. The source of Cu and of the other elements present in the quartz veins must be sought in the host chloritoid-bearing schists.

Keywords: copper sulfides, transformation sequences, Vielsalm, Stavelot Massif, Belgium.

This article has been cited by other articles:

				C. Pirard and F. Hatert THE SULFIDES AND SELENIDES OF THE MUSONOI MINE, KOLWEZI, KATANGA, DEMOCRATIC REPUBLIC OF CONGO Can Mineral, February 1, 2008; 46(1): 219 - 231. [Abstract] [Full Text] [PDF]