Extreme Closed System Fractionation of Volatile-Rich, Ultrabasic Peralkaline Melt Inclusions and the Occurrence of Djerfisherite in the Kugda Alkaline Complex, Siberia

C. M. B. Henderson
1999 Mineralogical magazine  
Djerfisherite [K6(Cu,Fe,Ni)25S26C1] has been found as a daughter mineral in melt inclusions in melilite from a Kugda melilitolite. The inclusion mineral assemblage includes pyrrhotite, pentlandite, forsterite, diopside, monticellite, phlogopite, wollastonite, nepheline, sodalite, combeite, calcite, Na-K-Ca carbonate, and hydrated calcium silicates. The djerfisherite is Ni-rich rather than Cu-rich consistent with an ultimate upper mantle magma source. The djerfisherite-bearing assemblage formed
more » ... assemblage formed from primary carbonate/alkali-rich, melilititic melt inclusions which underwent extreme, closed-system, magmatic to postrnagmatic fractionation over a temperature range of >1000 ~ to <500~
doi:10.1180/002646199548529 fatcat:xjpw6akkkjcefg7tiw62zqxzmm