Journal ArticleDOI
Anhydrite in Nevado del Ruiz November 1985 pumice: relevance to the sulfur problem
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In this paper, the authors document the occurrence of anhydrite within a pumice phenocryst, and determine the sulfur contents of the quenched melts in this pummice and to consider if the anhydrites could have crystallized from the magma.About:
This article is published in Journal of Volcanology and Geothermal Research.The article was published on 1990-07-30. It has received 34 citations till now. The article focuses on the topics: Pumice & Anhydrite.read more
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Journal ArticleDOI
Excessive degassing of Izu-Oshima volcano: magma convection in a conduit
TL;DR: In this article, a convective transport of magma through a conduit is proposed as the mechanism that causes degassing from a reservoir at several kilometers depth, which is quantitatively evaluated based on two fluid-dynamic models: Poiseuille flow in a concentric double-walled pipe, and ascent of non-degassed magma spheres through the conduit filled with degassed volatiles.
Journal ArticleDOI
Excess degassing from volcanoes and its role on eruptive and intrusive activity
TL;DR: In this paper, three mechanisms are proposed to explain various degassing modes, including eruption of bubble-accumulated magma, degassing of a convecting magma column, and permeable gas transportation from a deep magma chamber.
Journal ArticleDOI
A review of the stable-isotope geochemistry of sulfate minerals in selected igneous environments and related hydrothermal systems
TL;DR: The geochemistry of sulfate minerals in I-type igneous rocks and in the various related hydrothermal systems that develop from their magmas and evolved fluids is reviewed with respect to the degree of approach to isotope equilibrium between minerals and their parental aqueous species as mentioned in this paper.
Book ChapterDOI
Sulfidation State of Fluids in Active and Extinct Hydrothermal Systems: Transitions from Porphyry to Epithermal Environments
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Silicate-melt inclusions in magmatic rocks: applications to petrology
TL;DR: In this article, a detailed petrographic study was conducted to characterise silicate-melt inclusion primary characters and posttrapping evolution, including melt crystallisation, and high temperature studies were conducted to rehomogenise the inclusion content and select chemically representative inclusions.
References
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Journal ArticleDOI
Reference Samples for Electron Microprobe Analysis
TL;DR: In this paper, chemical analyses of twenty-six minerals, four natural glasses, and one synthetic glass were presented for use as microprobe reference samples, and details of sample preparation were described and homogeneity of the samples has been tested by the homogeneity index.
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Phase equilibria of rock-forming ferromagnesian silicates in granitic systems
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Solubility of Sulfur in Mafic Magmas
TL;DR: In this article, it was shown that a temperature increase of 100 degrees C magnifies the capacity of a mafic magma to dissolve sulfur by a factor of 5 to 7 times, assuming a constant ratio of O2 to S2.
Journal ArticleDOI
The ferric-ferrous ratio of natural silicate liquids equilibrated in air
TL;DR: In this article, the results of 46 melting experiments in air at 1,350° C and 1,450° C on rocks ranging in composition from nephelinite to rhyolite have been combined with other published data to obtain an empirical equation relating in \((X_{{\text{Fe}}_{\text{2}} {\text{O}}_{''text{3}} }^{{text{liq}}} /X_{{FeO })\) to T,
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The 1982 eruptions of El Chichón Volcano, Chiapas, Mexico: Mineralogy and petrology of the anhydritebearing pumices
TL;DR: The El Chichon trachyandesite was at a relatively low temperature in the range 750° to 850°C, with fO2 above the Ni-NiO buffer as mentioned in this paper.