The effect of water on the viscosity of a haplogranitic melt under P-T-X conditions relevant to silicic volcanism
Article Abstract:
Water content has a strong effect on the viscosity of hydrous silicic melts. Viscometric studies on synthesized hydrous haplogranitic melts serving as a model for calcalkaline rhyolites show that viscosity drops nonlinearly with the addition of water. The results of the study are used to reveal the similarity in the effects of alkali oxides on the viscosity of silica melt and water on that of a rhyolite melt. The consequences for degassing subvolcanic silicic melts are detailed. Significance of the prevailing pressure-temperature-composition conditions during volcanism is emphasized.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Kisseynew metasedimentary gneiss belt, Trans-Hudson orogen (Canada): back-arc origin and collisional inversion: comment and reply
Article Abstract:
Zwanzig questions the validity of the back-arc model of the Kisseynew area used by Ansdell, Lucas, Connors and Stern citing five principal issues. Ansdell and company appreciated a point made by Zwanzig on inferring past plate configuration using geometries in collisional orogens but they maintain that other issues brought by Zwanzig does not disprove their tectonic model. Also, they argue that to understand the evolution of the Kisseynew metasedimentary gneiss belt, a predictive tectonic framework is needed.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1997
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