Results 181 to 190 of about 536,264 (226)
Some of the next articles are maybe not open access.
Illegitimate magmas of the Galápagos: Insights into mantle mixing and magma transport
Geology, 1999Roughly 1–2% of the flows erupted from flank vents of the western Galapagos shield volcanoes have anomalous compositions. We call these illegitimate magmas because of their uncertain parentage. Because some illegitimate magmas are compositionally indistinguishable from lavas of an adjacent volcano and erupt from the flank facing the adjacent volcano ...
Dennis Geist +3 more
openaire +1 more source
Analysis and simulation of magma mixing processes in 3D
Lithos, 2002Abstract Magma mixing structures from the lava flow of Lesbos (Greece) are analyzed in three dimensions using a technique that, starting from the serial sections of rock cubes, allows the reconstruction of the spatial distribution of magmas inside rocks.
PERUGINI, Diego +2 more
openaire +2 more sources
Magma mixing and magma plumbing systems in island arcs
Bulletin Volcanologique, 1984Petrographic features of mixed rocks in island arcs, especially those originating by the mixing of magmas with a large compositional and temperature difference, such as basalt and dacite, suggest that the whole mixing process from their first contact to the final cooling (= eruption) has occurred continuously and in a relatively short time period. This
openaire +1 more source
The Fingerprint of Magma Mixing in Minerals
2021Disequilibrium textures in minerals are common in igneous rocks and can be caused by variations in pressure, temperature, or composition that perturbed a pre-existing state of equilibrium of the magma body. Although the variation of intensive variables can be invoked as the triggering factor, there is evidence that disequilibrium did not propagate ...
openaire +1 more source
Magma mixing in alkaline magmas: An example from Tenerife, Canary Islands
Lithos, 1994Abstract The central region of Tenerife (Canary Islands) offers a wide variety of alkaline rocks of intermediate composition between basalts and more differentiated magmas. A recent (less than 0.1 Ma old) eruption on the southwestern slopes of Teide volcano produced separate felsic (SiO 2 ∼59%) and mafic (SiO 2 ∼47%) rocks as well as abundant hybrid ...
V. Araña +4 more
openaire +1 more source
Water and magmas; a mixing model
Geochimica et Cosmochimica Acta, 1975Abstract A model for the mixing of H2O and silicate melts has been derived from the experimentally determined effects of H2O on the viscosity (fluidity), volumes, electrical conductivities, and especially the thermodynamic properties of hydrous aluminosilicate melts.
openaire +1 more source
Magma mixing in a squeezed conduit
Earth and Planetary Science Letters, 1987Abstract The mixing of mafic and silicic magmas in a squeezed conduit is simulated by fluid dynamics experiments using glue and dilute glycerin in a squeezed vinyl tube. Lighter and more viscous glue initially stably overlies dilute glycerin in a tube.
openaire +1 more source
Self-organization in convective magma mixing
Earth-Science Reviews, 1990Abstract Convective magma mixing is driven by thermal and compositional effects on melt density. We investigated the role of compositional buoyancy in convective magma mixing by means of two-dimensional numerical simulation. Two kinds of self-organization phenomena were observed in our simulations: (1) temporally-local unmixing events associated with
C OLDENBURG, F SPERA, D YUEN
openaire +1 more source
The Merensky Reef, Bushveld Complex: Mixing of Minerals Not Mixing of Magmas
Economic Geology, 2005A major geochemical hiatus occurs in the Bushveld Complex at the level of the platiniferous Merensky reef, close to the Critical-Main zone boundary. The origin of this hiatus and its relationship to mineralization has not been fully resolved. Initial Sr isotope ratios for plagioclase and Cr/MgO values for orthopyroxene from Critical and Main zone rocks
C. L. Seabrook +2 more
openaire +2 more sources
Role of viscous folding in magma mixing
Chemical Geology, 2018Abstract Magma mixing is a complex phenomenon and occurs through the interplay of a number of processes. Recent developments in microfluidics and chaotic mixing experiments have enabled us to better understand the complex processes associated with magma mixing from the hybrid rocks of the Ghansura Rhyolite Dome (GRD) of Proterozoic Chotanagpur ...
Bibhuti Gogoi, Ashima Saikia
openaire +1 more source