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Extreme closed system fractionation of volatile-rich, ultrabasic peralkaline melt inclusions and the occurrence of djerfisherite in the Kugda alkaline complex, Siberia

Published online by Cambridge University Press:  05 July 2018

C. M. B. Henderson
Affiliation:
Department of Earth Sciences, University of Manchester, M13 9PL, UK
L. N. Kogarko
Affiliation:
Vernadsky Institute of Geochemistry, Academy of Sciences, Moscow 117975, Russia
D. A. Plant
Affiliation:
Department of Earth Sciences, University of Manchester, M13 9PL, UK

Abstract

Djerfisherite [K6(Cu,Fe,Ni)25S26Cl] 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 from primary carbonate/alkali-rich, melilititic melt inclusions which underwent extreme, closed-system, magmatic to postmagmatic fractionation over a temperature range of >1000° to <500 °C.

Type
Letter
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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