Results 171 to 180 of about 5,229 (211)
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Water diffusion in basaltic to dacitic glasses
Chemical Geology, 2006Abstract Dehydration experiments on basaltic, andesitic and dacitic glasses with 1.1, 0.7 and 1.0 wt.% total water, respectively, were performed at 400–675 °C and 0.1 MPa. The dehydration rates were measured by in situ infrared (IR) spectroscopy and modeled by assuming the diffusion of one component water (total water).
Satoshi Okumura, Satoru Nakashima
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Contributions to Mineralogy and Petrology, 1991
Effective binary diffusion coefficients of Si during the interdiffusion of hydrous, 3 and 6% H2O, dacitic and rhyolitic melts have been determined at 1.0 GPa, 1100°–1400°C. Water is shown to enhance diffusivities by one to two orders of magnitude above dry Si diffusivities in the same compositional system for SiO2 compositions 65–75wt%.
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Effective binary diffusion coefficients of Si during the interdiffusion of hydrous, 3 and 6% H2O, dacitic and rhyolitic melts have been determined at 1.0 GPa, 1100°–1400°C. Water is shown to enhance diffusivities by one to two orders of magnitude above dry Si diffusivities in the same compositional system for SiO2 compositions 65–75wt%.
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H2O diffusion in dacitic and andesitic melts
Geochimica et Cosmochimica Acta, 2004Abstract The diffusion of water in dacitic and andesitic melts was investigated at temperatures of 1458 to 1858 K and pressures between 0.5 and 1.5 GPa using the diffusion couple technique. Pairs of nominally dry glasses and hydrous glasses containing between 1.5 and 6.3 wt.% dissolved H2O were heated for 60 to 480 s in a piston cylinder apparatus ...
Harald Behrens +2 more
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Quarterly Journal of the Geological Society of London, 1910
I. I ntroduction . T he rocks with which this paper deals occur about 25 miles distant from Melbourne, in a direction a little south of east. The area is all included within the parish of Narree Worran, in the counties of Evelyn and Mornington.
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I. I ntroduction . T he rocks with which this paper deals occur about 25 miles distant from Melbourne, in a direction a little south of east. The area is all included within the parish of Narree Worran, in the counties of Evelyn and Mornington.
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Geochemistry of dacitic volcanics in the Eastern Pontides (NE Turkey)
Geochemistry International, 2014Dacitic rocks that crop out around the Zigana Mountain (Gumushane) in the eastern Pontide (NE Turkey), are mainly composed of quartz, plagioclase, sanidine, amphibole, muscovite, and biotite as the main minerals. Zircon and rutile are the accessory minerals. Pyrite, chalcopyrite, and covellite are the opaque components.
Ferkan Sipahi, M. Burhan Sadιklar
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1979
Abstract The dacites of the Lesser Antilles represent the acid end-members of a calc-alkaline, island arc volcanic suite. Rocks containing 65% or more silica by wet chemical analysis form an estimated 7% of the surface area of the volcanic Lesser Antilles, and are relatively more abundant in the central part of the island arc.
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Abstract The dacites of the Lesser Antilles represent the acid end-members of a calc-alkaline, island arc volcanic suite. Rocks containing 65% or more silica by wet chemical analysis form an estimated 7% of the surface area of the volcanic Lesser Antilles, and are relatively more abundant in the central part of the island arc.
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A large dacitic lava flow in northern chile
Bulletin Volcanologique, 1969A dacitic lava flow with a volume of about 24 km3 is described. This flow is the largest of three of this type which were erupted in the youngest phase of volcanism in one part of the Andes of northern Chile. The majority of volcanoes erupted during this phase are more andesitic in composition and are made up of small flows and pyroclastic materials.
J. E. Guest, J. Sánchez R
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Effect of moisture and temperature on the fracture morphology of dacite
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1971Abstract A direct relation was found between point-load tensile strength and percentage of void fracture in a series of dacite discs. The dacite of this study is a glassy rock with about 25 per cent voids. The discs were loaded to failure at 15 kg/sec in dry and water-saturated environments at 20° and 100°.
R.J. Willard, K.E. Hjelmstad
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Utilization of Dacite as Alternative Aggregate in Asphalt Mixture
Key Engineering Materials, 2012With the widespread application of asphalt mixture, current demand from transportation managers for construction and maintenance of their pavement network consumes large numbers of aggregates. If agencies excessively favor to some certain kinds of excellent aggregates, the cost of construction could be considerably expensive.
Shao Peng Wu, Pan Pan, Ming Yu Chen
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Origin of High-Alumina Basalt, Andesite, and Dacite Magmas
Science, 1964The typical volcanic rocks of most island arcs and eugeosynclines, and of some continental environments, are basalt, andesite, and dacite, of high alumina content. The high-alumina basalt differs from tholeiitic basalt primarily in having a greater content of the components of calcic plagioclase. Laboratory data indicate that in the upper mantle, below
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