Results 81 to 90 of about 23,377 (238)

Electromagnetic expression of axial magma chambers

open access: yesGeophysical Research Letters, 1989
The electrical conductivity of sea floor materials is a strong function of porosity, pore geometry, fluid content, temperature and percentage of partial melt. These material properties are particularly volatile near the midocean ridge. Tracking electromagnetic eddy currents generated on the sea floor as they diffuse across the ridge can provide images ...
M. E. Everett, R. N. Edwards
openaire   +1 more source

The Origin of Co-Magmatic Andesite Enclaves in the Rabor Miocene Pyroxene Andesites, SE Kerman, Iran: Insights from Textural and Mineralogical Composition [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 2012
The Miocene pyroxene andesite lava flows are exposed in southeastern edge of Urumieh Dokhtar Magmatic assemblage in Iran. The hypocrystalline andesite in parts contain conspicuous co-magmatic igneous enclaves which are dark grey and occur mostly as ...
S. S. Dargahi
doaj  

Formation and evolution of the chromitites of the Stillwater Complex : a trace element study [PDF]

open access: yes, 2011
Large layered intrusions, such as the Stillwater Complex, contain cyclic units of chromite-rich layers (cm to m thick) having kilometre-scale lateral extension.
Barnes, Sarah-Jane   +2 more
core   +1 more source

Timescale of open-reservoir evolution beneath the south Cleft segment, Juan de Fuca ridge

open access: yes, 2011
International audienceLavas erupted at the southern end of the intermediate Juan de Fuca ridge (Cleft segment) are mostly cogenetic and their chemical diversity results from melt evolution in an open magma system.
Caroff, Martial   +2 more
core   +3 more sources

The theoretical basis for textural indices of eruption dynamics: review and new conceptual models

open access: yesEarth, Planets and Space
The textural indices of eruption products (pumice, scoria and lavas), number density of crystals or bubbles, or characteristics of their size distributions, have been proposed to estimate dynamic properties such as magma ascent rates, on the basis of ...
Atsushi Toramaru
doaj   +1 more source

Role of mechanical erosion in controlling the effusion rate of basaltic eruptions

open access: yesGeophysical Research Letters, 2016
In many basaltic eruptions, observations show that the effusion rate of magma has a typical dependence on time: the effusion rate curves show first a period of increasing and later a decreasing phase by a maximum value. We present a model to explain this
Antonello Piombo   +2 more
doaj   +1 more source

The shallow magma chamber of Stromboli Volcano (Italy)

open access: yesGeophysical Research Letters, 2017
In this work, we integrate artificial and natural seismic sources data to obtain high‐resolution images of the shallow inner structure of Stromboli Volcano. Overall, we used a total of 21,953 P readings from an active seismic experiment and an additional
D. Patanè   +8 more
doaj   +1 more source

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