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- W2899298603 abstract "A peralkaline phonolite from Hohoi Bay (Ua Pou Island, Marquesas archipelago) contains : yellow areas of centimetric size resembling the petals of a flower and containing many small Ti-andradite crystals ; microphenocrysts of pseudoleucite or pseudo-analcite, destabilized into sanidine + nepheline + analcite ; phenocrysts of nepheline ; aegirin augite, sanidine, nepheline, sodalite, analcite in the matrix. The compositions of all these phases are established by microprobe analysis. The yellow areas are considered as partially destabilized primary garnets, and their petrogenetic meaning is discussed. The primary nature of the pseudomorphs is also discussed in the light of their composition and of the position of the Ua Pou phonolites in the Residua System diagrams. Though no definitive argument can be proposed, the pseudoleucite hypothesis is tentatively preferred to the pseudo-analcite hypothesis ; the occurrence of (destabilized) leucite in the oceanic alkali basalt series of Ua Pou is therefore possible." @default.
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- W2899298603 date "1978-01-01" @default.
- W2899298603 modified "2023-10-17" @default.
- W2899298603 title "Minéralogie d'une phonolite à grenat de l'île de Ua Pou (Marquises, Pacifique central)" @default.
- W2899298603 doi "https://doi.org/10.3406/bulmi.1978.7168" @default.
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