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The metal-rich portions of the phase system Cu-Fe-Pd-S at 1000°C, 900°C and 725°C: implications for mineralization in the Skaergaard intrusion

¹ Environment and Resources, Technical University of Denmark, Bygning 113, DK-2800 Lyngby, Denmark
² Department of Geography and Geology. University of Copenhagen, Ø.Voldgade 10, DK-1350 Copenhagen, Denmark
³ Sciences Appliquées, Université du Québec à Chicoutimi, 555 Boulevard Université, Chicoutimi, G7H 2B1 Canada

^* E-mail: Emilm{at}geo.ku.dk

The sulphur-poor portions of the dry condensed Cu-Fe-Pd-S system were studied at 1000ºC, 900ºC and 725ºC by synthesis in evacuated silicate glass tubes, along with textural observations and electron microprobe analyses of equilibrated reaction products. Sulphide melt coexists with Cu-Fe-Pd alloys, bornite, Fe_1–xS and iss (intermediate solid solution, Cabri, 1973) and Pd₄S. Compositional data were obtained for the associations bornite-alloy-melt, pyrrhotite-alloy-melt and for immiscible Cu-rich sulphide melts. Partition coefficients for all three metals were derived for the association alloy-melt. Formation of the two new Cu-Pd alloy minerals, skaergaardite and nielsenite, is discussed in terms of the present findings.

KEYWORDS: Cu-Pd-Fe-S phase system, sulphide melt, Cu-Pd-Fe alloy, bornite, skaergaardite, nielsenite