A diabase dike intruding a Cu-Zn massive sulfide orebody has caused a migration of copper and sulfur in the orebody towards the dike, but neither element penetrated the glassy chilled margins of the dike. This resulted in the development of a chalcopyrite-rich zone along the contact and a much broader zone of sulfur enrichment within which pyrrhotite was firstly sulfur enriched and then converted to pyrite and where the iron content of sphalerite was decreased.

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