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- W319288785 abstract "Sporatic enrichments of fluorapatite occur in trondhjemitic intrusions, near Timmins. The sheeted trondhjemites have intruded a deformed ultramafic-Fe tholeiite complex, disposed in the hagingwall of the Destor-Porcupine fault zone. These lithologies have collectively been modified by variable intensities of muscovite-carbonate alteration with attendant vein-related Au deposition. Fluorapatite occurs in veinlets and as subhedral to euhedral crystals coevial with carbonate alteration. Most trondhjemites have REE distributions characteristic of trondjemitic rocks in general where La=150 and La/Yb=30: however a few possess unusual flat depleted patterns, such that La=10 and La/Yb=1. Fluorapatite-bearing examples have P205 up to 8 wt%, TiO2=0.60, Zr=700ppm, Y=75, Th=7, Th/U=3. La=1500 ppm and La/Yb=100, signifying extreme enrichment of certain LIL-elements, in a process interpreted to be allied to fenitization. The fenites, in conjunction with LIL-enriched potassic basalts and lamprophyres are arrayed along major structural linements which also host many of the Abitibi deposits. This petrological association is indicative of rift environments, raising the possibility that major structures initiated as transcrustal listric normal faults accommodating rifting, and acted as sites for extrusion of komatiites. Subsequently, during reverse translation, the fracture systems formed conduits for trondhjemitic magmas from the base of the crust, for auriferous fluids, and LIL-enriched magamas generated inmore » the upper mantle.« less" @default.
- W319288785 created "2016-06-24" @default.
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- W319288785 date "1985-01-01" @default.
- W319288785 modified "2023-09-25" @default.
- W319288785 title "Fluorapatite fenites and Au-deposits, Abitibi belt: petrological constraints on rift-environments of Archean gold systems" @default.
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