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magma
(redirected from Magmatism)

    Also found in: Medical, Wikipedia, Hutchinson 0.04 sec.
magma (măg`mə): see lava lava (lä`və), molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure.
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magma

Molten or partially molten rock from which igneous rocks form, usually consisting of silicate liquid. Magma migrates either at depth or to the Earth's surface, where it is ejected as lava. The interactions of several physical properties, including chemical composition, viscosity, content of dissolved gases, and temperature, determine the characteristics of magma. Numerous events that can occur during crystallization influence the resulting rock: separation of early crystals from liquid prevents reaction between them; magma can cool too rapidly for reaction to occur; and loss of volatiles may remove some components from the magma.

(symbolic mathematics, tool)Magma - A program used for heavy duty algebraic computation in many branches of mathematics. Magma, developed by John Cannon and associates at the University of Sydney, succeeded Cayley. It runs at several hundred sites.

E-mail: <magma@maths.usyd.edu.au>.

http://maths.usyd.edu.au:8000/u/magma/.

[W. Bosma, J. Cannon and C. Playoust, The Magma algebra system I: The user language, J. Symb. Comp., 24, 3/4, 1997, 235-265].


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Between 90 and 95 million years ago (Ma), a tectonic change from convergent-oblique to subduction-dextral strike-slip movement resulted in an episode of magmatism and the emplacement of the Tombstone series of intermediate to felsic plutons.
Great mining camps of Canada 1. The history and geology of the Keno ... by Cathro, R.J. / Geoscience Canada
A basic tenet of this model is that tectonism and magmatism [the formation of molten material] at Beta Regio and western Aphrodite are dominated by the evolution of plume heads or blobs as they rise to the base of the lithosphere and spread laterally," the authors write in the November GEOPHYSICAL RESEARCH LETTERS.
Blob tectonics on Venus by Science News
2001; David, in press), the Meso- to Eoarchean crustal components were variably assimilated by magmas produced during several episodes of pervasive Neoarchean magmatism and reworked by deformation and metamorphism.
Government geoscience stimulates mineral exploration in the superior ... by Simard, Martin / Geoscience Canada
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