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magma |
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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. ..... Click the link for more information. . magmaMolten 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. magma 1. a paste or suspension consisting of a finely divided solid dispersed in a liquid 2. hot molten rock, usually formed in the earth's upper mantle, some of which finds its way into the crust and onto the earth's surface, where it solidifies to form igneous rock magma [′mag·mə] (geology) The molten rock material from which igneous rocks are formed.
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| 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. It's the roots of three volcanoes that are composite cones formed in the Mid-Continent rift system with deep fault structures that went deep into the mantle, tapped these balsaltic magmas and intrusions that have platinum, palladium and copper in them, which came up along the fractures. However, most models ignore details of fiendishly complicated parameters, such as changes in the magmas viscosity as a function of temperature. |
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