Complex colour and chemical zoning of sodalite-group phases in a hauynophyre lava from Mt. Vulture, Italy | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Complex colour and chemical zoning of sodalite-group phases in a hauynophyre lava from Mt. Vulture, Italy

Type de publication:

Journal Article

Source:

Mineralogical Magazine, Volume 68, Ticket 4, p.591-614 (2004)

ISBN:

0026-461X

Mots-clés:

MAGMAS; HAUYNE; MELTS; ABUNDANCES; PETROLOGY

Résumé:

The hauynophyre emitted from a parasitic vent of the Vulture stratovolcano is a S- and Cl-rich, leucite-melilite-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 hauynes, 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 SO4 in black hauynes and in white noseans, while it is partly reduced to form S-3(-) groups in blue lazurites, which also contain H2O molecules. Structural and chemical data strongly question the validity of the Hogarth and Griffin (1976) method widely used to resolve the ratio S6+/S2- 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 hauynes have highly variable S/Cl and slightly lower SiO2/Al2O3 ratios, larger Fe-TOT contents and more compatible trace elements than lazurites. Thin opaque nosean-sodalite 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(SiO2) and a(H2O) of the silicate melts.

Notes:

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