Results 1 to 10 of about 23,609 (212)

Frequency dependent rheology of vesicular rhyolite [PDF]

Journal of Geophysical Research: Solid Earth, 1993
Frequency dependent rheology of magmas may result from the presence of inclusions (bubbles, crystals) in the melt and/or from viscoelastic behavior of the melt itself. With the addition of deformable inclusions to a melt possessing viscoelastic properties one might expect changes in the relaxation spectrum of the shear stresses of the material (e.g ...
Bagdassarov, Nikolai, Dingwell, Donald B.   +1 more
openaire   +5 more sources

Petrology and geochemistry of Noraldinabad rhyolites, NW Iran [PDF]

پترولوژی, 2023
Felsic igneous rocks record crustal evolutions and provide an important tool for determining the composition and modification of the crust (Zhang et al., 2018). Up to now, several classifications have been proposed for granites and rhyolites.
Mohammad Hosseinikia, Masoumeh Ahangari, Manijeh Asadpour   +2 more
doaj   +1 more source

Vesiculation of Rhyolitic Melts Under Oscillatory Pressure

Frontiers in Earth Science, 2022
Magma ascending in the Earth’s crust can undergo oscillations in pressure, from ultra-low frequency changes associated with tectonics, to relatively higher frequency oscillations associated with seismicity.
Gilles Seropian, Ben M. Kennedy, Jackie E. Kendrick, Jackie E. Kendrick, Yan Lavallée, Alexander R. L. Nichols, Felix W. von Aulock, Donald B. Dingwell, Kai-Uwe Hess, Anthony Lamur, Jenny Schauroth, Jérémie Vasseur, Fabian B. Wadsworth   +12 more
doaj   +1 more source

Facies architecture and volcanological aspects of silicic rocks from the Palmas plateau, Brazil

Brazilian Journal of Geology, 2020
The nature of the extensive silicic units of the Paraná Igneous Province is still heavily debated. The silicic rocks that outcrop in the Palmas plateau (Southwestern Parana State) show aphyric texture and TiO2 < 0.86%, being classified as Palmas-type ...
Luanna Chmyz, Eleonora Maria Gouvêa Vasconcellos, Otavio Augusto Boni Licht   +2 more
doaj   +1 more source

Petrogenesis of Havre Volcano in the Kermadec Arc: 2012 Eruption of a Chemically Homogeneous Rhyolite

Frontiers in Earth Science, 2022
The 2012 Havre submarine eruption produced a 1.5 km3 bulk rock volume or 0.52 km3 dense rock equivalent volume of rhyolite emplaced as minor lava flows, a field of sunken seafloor pumice, and a volumetrically dominant pumice raft.
J. Knafelc, D. Gust, S. E. Bryan, M. Anderson, H. E. Cathey, H. E. Cathey   +5 more
doaj   +1 more source

Columbia River Rhyolites: Age-Distribution Patterns and Their Implications for Arrival, Location, and Dispersion of Continental Flood Basalt Magmas in the Crust

Geosciences, 2023
Columbia River province magmatism is now known to include abundant and widespread rhyolite centers even though the view that the earliest rhyolites erupted from the McDermitt Caldera and other nearby volcanic fields along the Oregon–Nevada state border ...
Martin J. Streck, Vanessa M. Swenton, William McIntosh, Mark L. Ferns, Matt Heizler   +4 more
doaj   +1 more source

In situ probing of the present-day zircon-bearing magma chamber at Krafla, Northeastern Iceland

Frontiers in Earth Science, 2023
Active felsic magmatism has been rarely probed in situ by drilling but one recent exception is quenched rhyolite sampled during the 2009 Iceland Deep Drilling Project (IDDP).
Anastassia Y. Borisova, Oleg E. Melnik, Oleg E. Melnik, Nicolas Gaborit, Ilya N. Bindeman, Thibault Traillou, Marie Raffarin, Andri Stefánsson, Oscar Laurent, Mathieu Leisen, Xavier Llovet, Philippe de Parseval, Arnaud Proietti, Stephen Tait   +13 more
doaj   +1 more source

Thermal properties of vesicular rhyolite [PDF]

, 1994
Thermal diffusivity of rhyolite melt and rhyolite foam (70–80% porosity) has been measured using the radial heat transfer method. Cylindrical samples (length 50–55 mm, diameter 22 mm) of rhyolite melt and foam have been derived by heating samples of ...
Bagdassarov, Bagdassarov, Birch, Blake, Brandeis, Carrigan, D. Dingwell, Eichelberger, Eichelberger, Eichelberger, Fink, Fink, Gable, Geotti-Bianchini, Hampton, Heide, Heiken, Hurle, Jaupart, Jeffreys, Lee, Loeb, Manley, Marsh, Murase, N. Bagdassarov, Neuville, Nield, Oldenburg, Parrot, Sheffield, Sparks, Toramaru, Turner, Webb, Webb, Wilson, Worster   +37 more
core   +1 more source

Hydrothermal Activity in the Southwest Yellowstone Plateau Volcanic Field

Geochemistry, Geophysics, Geosystems, 2020
In the past two decades, the U.S. Geological Survey and the National Park Service have studied hydrothermal activity across the Yellowstone Plateau Volcanic Field (YPVF) to improve the understanding of the magmatic‐hydrothermal system and to provide a ...
S. Hurwitz, R. B. McCleskey, D. Bergfeld, S. E. Peek, D. D. Susong, D. A. Roth, J. D. G. Hungerford, E. B. White, L. N. Harrison, B. Hosseini, R. G. Vaughan, A. G. Hunt, J. B. Paces   +12 more
doaj   +1 more source

Viscoelasticity of crystal- and bubble-bearing rhyolite melts [PDF]

, 1994
The effect of non-deformable inclusions on the frequency-dependent rheology of a rhyolite melt plus crystals has been investigated using a sinusoidal torsion deformation device for measurements of shear viscosity and modulus in the frequency range of 5 ...
Angell, Arzi, Bagdassarov, Bagdassarov, Bagdassarov, Berckhemer, Brawer, Candela, Chen, Cole, D.B. Dingwell, Dingwell, Fink, Kanai, Körnig, Matsumoto, Michaels, N.S. Bagdassarov, Nguyen, Nowick, Onogi, Perez, Philippoff, Pinkerton, Pinkerton, Roscoe, Roscoe, Ryerson, S.L. Webb, Scherer, Stein, Tazieff, Webb, Williams, Wohletz, Zosel   +35 more
core   +1 more source