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Zoned tungstenoan molybdenite occurs in a fenite (~80 modal % nepheline) within a strongly heterogeneous fenitized megaxenolith (~0.2 km) enclosed by nepheline syenite, in the Khibina alkaline complex, Kola Peninsula, Russia. Molybdenite forms euhedral crystals (~50-60  m in length), enclosed by pyrrhotite, and abundant veinlets among silicates. The crystals are zoned with respect to tungsten, which is strongly enriched in the central zone. This area is 5-6  m across and contains up to 5.85 wt.% W (0.05 atoms per formula unit). Tungsten-rich zones of the molybdenite veinlets contain the same concentration of W as the central zone of the euhedral crystals, implying similar conditions of formation. There is thus a substantial solid-solution between molybdenite and tungstenite. We attribute the outward zoning to W-poor molybdenite in terms of increasing fugacity of oxygen and decreasing fugacity of sulfur, apparently in the presence of a reduced H 2S-CH 4-rich fluid of subalkaline character. The existence of locally reducing conditions in the fenite(s) at Khibina also is implied by the adjacent occurrences of titaniu m- and niobium-rich sulfides and a graphite-like material.

ZONED TUNGSTENOAN MOLYBDENITE FROM A FENITIZED MEGAXENOLITH IN THE KHIBINA ALKALINE COMPLEX, KOLA PENINSULA, RUSSIA