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• W2465404028 abstract "The Peuyuk kimberlite is divisable into three petrographically dis- tinct phases (A, B, and C) on the basis of oxide mineralogy and the presence or absence of an immiscible carbonate liquid. Phase A contains spinels (titan-magnesian-aluminous chromite) and per- ovskite with no reaction rims or complex mantles, and no evidence of an immiscible carbonate liquid. Phase B contains complexly zoned and mantled oxides with no evidence of an immiscible carbonate liquid. The spinels are zoned from titan-magnesian- aluminous chromite to members of the magnesian ulvospinel-ulvospinel- magnetite series. The zoned spinels are mantled by a serpentine-carbonate mixture followed by a mixture of Ti free magnetite and minor rutile. Perov- skites are mantled by nickeliferous pyrite (0-11% Ni) and rutile. Phase C is characterized by the presence of an immiscible carbonate liquid. Spinels are either discrete crystals of magnesian ulvospinel-ulvospinel- magnetite or as discrete rims of this composition upon cores of titan-magne- sian-aluminous chromite. Rutile rims are poorly developed upon perovskites. Sulphides associated with the silicate groundmass are Cu-pentlandite, heazle- woodite and chalcopyrite. Nickeliferous pyrite is associated with the carbon- ate fraction. Common to all phases of the intrusion is a red titanium poor aluminous- magnesian chromite which is interpreted to have formed prior to the fluidized intrusion of the kimberlite. All other spinels being considered to have crys- tallized after fluidization. The spinel composition trends may reflect decreasing oxygen fugacities (10-19 to 10-2z bars) in response to falling temperatures (800~00 ~ C) along the quartz-fayalite-magnetite buffer. In the immediate post-fluidization history of the diatreme all phases crystallized titan-magnesian-aluminous chromite but the trends of Ti and Fe enrichment observed in phases B and C was prevented in phase A possibly by rapid cooling. Slower cooling coupled with reaction of earlier formed phases with residual H20 and CO 2 rich fuids resulted in the phase B assem- blage. Extensive reaction of this type was prevented in phase C by the separation of an immiscible carbonate liquid." @default.
• W2465404028 created "2016-07-22" @default.
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• W2465404028 date "1976-01-01" @default.
• W2465404028 modified "2023-09-23" @default.
• W2465404028 title "Oxide and Sulphide Mineralogy of the Somerset Island, N.W.T., Canada" @default.
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