Results 31 to 40 of about 92,567 (225)
Transient conduit permeability controlled by a shift between compactant shear and dilatant rupture at Unzen volcano (Japan) [PDF]
Solid Earth, 2022 The permeability of magma in volcanic conduits controls the fluid flow and pore pressure development that regulates gas emissions and the style of volcanic eruptions.
Y. Lavallée +17 more
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Volcanic precursors in light of eruption mechanisms at Vesuvius
Annals of Geophysics, 2013 Vesuvius entered a quiescent stage after the eruption of March-April 1944. The eruption was not much different or larger than other before, like for example the one of 1906, but it occurred at the end of a long period during which it was observed a ...
Roberto Scandone, Lisetta Giacomelli
doaj +1 more source
Sulfur_X: A model of sulfur degassing during magma ascent
Geochemistry, Geophysics, Geosystems, 2022 The degassing of CO2 and S from arc volcanoes is fundamentally important to global climate, eruption forecasting, and cycling of volatiles through subduction zones. However, all existing thermodynamic/empirical models have difficulties reproducing CO2-H2O-S trends observed in melt inclusions and provide widely conflicting results regarding the ...
Shuo Ding +3 more
openaire +2 more sources
Channelized melt flow in downwelling mantle: Implications for 226Ra-210Pb disequilibria in arc magmas [PDF]
, 2008 We present the results of an analytical model of porous flow of viscous melt into a steadily dilating ‘‘channel’’ (defined as a cluster of smaller veins) in downwelling subarc mantle.
Koenders, M. A. +7 more
core +1 more source
Magma Plumbing During the 2014–2015 Eruption of Fogo (Cape Verde Islands)
Frontiers in Earth Science, 2020 Phenocrysts in volcanic rocks are recorders of magmatic processes that have occurred at depth before and during a volcanic eruption. Our petrological investigations of stratigraphically controlled tephrite and phonotephrite samples from the latest ...
Andreas Klügel +3 more
doaj +1 more source
Combining Magma Flow and Deformation Modeling to Explain Observed Changes in Tilt
Frontiers in Earth Science, 2019 The understanding of magma ascent dynamics is essential in forecasting the scale, style and timing of volcanic eruptions. The monitoring of near-field deformation is widely used to gain insight into these dynamics, and has been linked to stress changes ...
Luke H. Marsden +4 more
doaj +1 more source
Earth, Planets and Space, 2023 Nishiyama volcano on Hachijojima Island is an active basaltic volcano located in the Izu–Bonin arc. In this study, petrological and geochemical analyses were conducted on mafic lavas and pyroclastics to understand the magma plumbing system and pre ...
Kazuki Oiwa +3 more
doaj +1 more source
Annals of Geophysics, 2004 Quartz-rich xenoliths in lavas (basalts to andesites; 90-30 ka) from Alicudi contain abundant melt and fluid inclusions. Two generations of CO2-rich fluid inclusions are present in quartz-rich xenolith grains: early (Type I) inclusions related to partial
A. Peccerillo +3 more
doaj +1 more source
Model for the origin, ascent, and eruption of lunar picritic magmas [PDF]
American Mineralogist, 2017 A model for the origin, ascent, and eruption of the lunar A17 orange glass magma has been constructed using petrological constraints from gas solubility experiments and from analyses of the lunar sample 74220 to better determine the nature and origin of this unique explosive eruption. Three stages of the eruption have been identified.
Rutherford, Malcolm +4 more
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Geochemistry, Geophysics, Geosystems, 2021 Magma decompression rate is one of the most important parameters in controlling eruption dynamics. One way to determine decompression rate is by fitting a volatile elements diffusion profile to a concentration gradient in crystal‐hosted embayments ...
Guillaume Georgeais +3 more
doaj +1 more source