A rhenium-molybdenum-copper sulfide from the Lukkulaisvaara layered intrusion, northern Karelia, Russia
Barkov, Andrew Yu.; Lednev, Andrew I.
European Journal of Mineralogy Volume 5 Number 6 (1993), p. 1227 - 1234
published: Dec 1, 1993
manuscript accepted: Aug 30, 1993
manuscript received: Aug 17, 1992
ArtNo. ESP147050506014, Price: 29.00 €
Abstract A Re-Mo-Cu sulfide mineral occurs in pegmatoid plagioclase-bearing pyroxenite located in microgabbronorite sills. Small inclusions of the rhenium sulfide occur in chalcopyrite and are associated with base-metal sulfides, diverse assemblages of platinum-group minerals (PGM), hessite, Ag-Au alloys, and Re-bearing (up to 1 wt.% Re) molybdenite. The average of three electron-microprobe analyses corresponds to the empirical formula (Cu0.88Fe0.21)(Re2.94Mo1.04)S8.00. A model is proposed in which the formation of Cu-Ni-PGE-Re-bearing pyroxenite is due to the increase of fluid pressure during the solidification of the sills. The euhedral-subhedral rhenium sulfide morphology may reflect the greater force of crystallization by the rhenium mineral on the basemetal sulfides during exsolution.