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- W2150076692 abstract "Abstract The haüynophyre emitted from a parasitic vent of the Vulture stratovolcano is a S- and Cl-rich, leucitemelilite- bearing lava flow containing an unusually large amount of sodalite-group minerals (>23 vol.%). Mineralogical and chemical study of phenocrysts has led to the identification of black haüynes, blue lazurites and of Cl-rich white or black noseans. X-ray diffraction (XRD) study confirms the occurrence of nosean having a low symmetry ( P23 ). Raman spectra and XRD data show that S is fully oxidized to SO 4 in black haüynes and in white noseans, while it is partly reduced to form S 3 – groups in blue lazurites, which also contain H 2 O molecules. Structural and chemical data strongly question the validity of the Hogarth and Griffin (1976) method widely used to resolve the ratio S 6+ /S 2– in sodalite-group phases from EMPA data. Among euhedral phenocrysts, large lazurites are only faintly zoned. All other phases show variable core-rim chemical zoning and many phenocrysts are partially resorbed and/or colour-zoned. Black haüynes have highly variable S/Cl and slightly lower SiO 2 /Al 2 O 3 ratios, larger FeTOT contents and more compatible trace elements than lazurites. Thin opaque noseansodalite rims surrounding all crystals are interpreted as a result of rapid crystallization driven by exsolution of a S-scavenging fluid phase. We suggest that the extreme complexity of the mineralogical assemblage reflects variable a SiO 2 and a H 2 O of the silicate melts." @default.
- W2150076692 created "2016-06-24" @default.
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- W2150076692 date "2004-08-01" @default.
- W2150076692 modified "2023-09-26" @default.
- W2150076692 title "Complex colour and chemical zoning of sodalite-group phases in a haüynophyre lava from Mt. Vulture, Italy" @default.
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- W2150076692 doi "https://doi.org/10.1180/0026461046840206" @default.
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