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- W1963905921 abstract "Abstract Ilvaite is an alteration product of carbonate, which itself replaced clinopyroxene, in a Precambrian tholeiitic dyke. Additional secondary minerals are ferroactinolite, cummingtonite, chlorite, biotite, prehnite, and epidote. Microprobe analyses demonstrate that the ilvaite is close to the ideal end-member composition [CaFe 2 2+ Fe 3+ Si 2 O 8 (OH)] and that only cummingtonites, Mg/(Mg+Fe 2+ ) 0.77–0.39, and carbonates (solid solutions between calcite and dolomite, dolomite and ankerite, magnesite and siderite) show significant compositional variations. It is estimated that ilvaite formed at temperatures < 470 °C and at pressures < 2 kbar, probably during a low-grade metamorphic event (or events) associated with the Caledonian orogeny. The fluids involved in the alteration process contained both CO 2 and H 2 O, initial fluids probably being richer in CO 2 than later ones. Ilvaite may be more common in hydrothermally altered igneous rocks than previously supposed." @default.
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- W1963905921 date "1984-09-01" @default.
- W1963905921 modified "2023-10-13" @default.
- W1963905921 title "Secondary ilvaite in a dolerite dyke from Rogaland, SW Norway" @default.
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- W1963905921 doi "https://doi.org/10.1180/minmag.1984.048.348.17" @default.
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