Pre-eruptive melt composition and constraints on degassing of a water-rich pantellerite magma, Fantale volcano, Ethiopia
Article Abstract:
Ethiopia's Fantale volcano was studied to determine the pre-eruptive composition of prealkaline magma of glass inclusions in phenocrysts from a delayed eruption of a glass pantelleritic lava flow. It was observed that the pre-eruptive concentration of water in the Fantale magma was higher than in other pantellerite magmas. An observation of the matrix glass and crystal-free glass inclusions in the quartz revealed that the composition of the martix glass was identical to the composition of regular glass inclusions, except for the chlorine and water constituents. The adequate amount of chlorine and water present indicated that they exsolved after melt entrapment and degassing took place either as an equilibrium or disequilibrium process.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Influence of stretching and density contrasts on the chemical evolution of continental magmas: an example from the Ivrea-Verbano Zone
Article Abstract:
The underplated crust of the Ivrea-Verbano Zone, Western Alps, was formed by the fractional melting of the crust and synmagmatic stretching. Advanced degrees of partial melting formed interlayers of igneous mafic rocks in the crustal rocks (septa) of the complex. The crustal contamination near the septa changed the rare-earth-element patterns and Sr isotope content of the igneous rocks. Hybrid melts constitute the last septa occurring in the higher strata. The septa formed first were denser than those formed later. The synmagmatic stretching encouraged the mixing of the melts.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Behavior and effects of phosphorus in the system Na2O-K2O-Al2O3-SiO2-P2O5-H20 at 200 MPa(H2O)
Article Abstract:
An experiment was conducted by introducing phosphorus in an initially sub-aluminous haplogranitic melt to determine how itwould affect the system. The results showed that addition of phosphorus at 200 MPa(H2O) largely expanded the quartz liquidus field, increased water solubilitywith the addition of low phosphorus concentrations and promoted the fractionation of the melt towards a peralkaline, sodic, and silica poor but quartz saturated composition.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
User Contributions:
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