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- W2024183740 abstract "Plutonic blocks in the volcanic and pyroclastic rocks of Ascension Island contain a variety of silicate melt and fluid inclusions, mainly in the intermediate (monzonite-syenite) and granite types. The silicate melt inclusions consist of trapped granitic melt with a small contraction bubble. The fluid inclusions are: (i) highly saline (40 to > 67 wt. per cent NaCI) aqueous inclusions; (ii) low density CO2 + H2O inclusions, predominantly vapour and (iii) high density approximately pure H2O inclusions. Mixed silicate melt-saline aqueous fluid inclusions also occur showing that the original magma became saturated with respect to saline aqueous fluid and a magmatic origin is thus indicated for the saline fluid inclusions. Microprobe analysis of the silicate melt inclusions suggests that the original magma may have contained greater than 5 wt. per cent H2O before saturation was reached and homogenization temperatures show the trapping of the silicate melt took place between 715-790°C. Separated amphiboles from the granites have δD values which are significantly different from the whole rock δD values of the dry but otherwise chemically similar obsidians. Sheppard & Harris (1985) interpret this difference as reflecting a sea water source for the water in the gramtes. Qualitative and quantitative study of the fluid inclusions (extending the earlier work of Roedder & Coombs, 1967) suggests that at least one episode of fluid immiscibility (into aqueous liquid+vapour, i.e. ‘boiling’) occurred. This resulted in a loss of H2O via the vapour and increased the salinity of the remaining liquid. The initial fluids belonged to the system H2O-CO2-NaCl-KCl and the CO2 was strongly partitioned into the vapour phase during fluid unmixing, hence Xco2 decreased as the fluid evolved. A suite of gabbroic blocks from Dark Slope Crater contain pure CO fluid inclusions of just higher than critical density. Assuming a trapping temperature of 1000–1200°C the pressure must have been > 18 kb–28 kb or 7-11 km in depth, i.e. well below the base of the Ascension Cone. The pure CO2 inclusions in this suite of gabbros and the fluids in the H2O-CO2NaCl-KCl system would seem to require entirely different origins and it may be significant that these gabbros show a different isotopic Pb signature than do the volcanics and other blocks." @default.
- W2024183740 created "2016-06-24" @default.
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- W2024183740 date "1986-02-01" @default.
- W2024183740 modified "2023-10-14" @default.
- W2024183740 title "A Quantitative Study of Magmatic Inclusions in the Plutonic Ejecta of Ascension Island" @default.
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- W2024183740 doi "https://doi.org/10.1093/petrology/27.1.251" @default.
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