What Is The Percentage Of Silica In Granitic Magma
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Granodiorite is a plutonic igneous rock formed by intrusion of silica rich magma which cools in batholiths or stocks below the earth s surface.
What is the percentage of silica in granitic magma. How are igneous rocks classified. Granitic magmas are rich in silica and often contain up to several percent gas by weight. This gives the magma a high viscosity and causes it to move very sluggishly. As these magmas cool the silica starts to connect into complex molecules.
Other articles where granitic magma is discussed. Sluggish rhyolitic lava can slowly exude from a volcano and pile up around the vent. The name comes from two related rocks to which granodiorite is an intermediate. One major difference between basaltic and granitic magma is their specific mineral contents.
What is the type of magma containing a lot of silica and water vapor. Large crystals in pegmatites are the result of a high percentage of the melt being composed of water carbon dioxide and other materials. A basaltic pond of magma becomes trapped below continental crust and partially melts this silica rich crust into a granitic magma. Basaltic magma has 50 percent silica andesitic magma has 60 percent silica and granitic magma has 70 percent silica.
The amount of silica that is. There are three types of magma that contains silica. Basaltic magma is acidic fluid rich in iron and magnesium but poor in silica. Granitic magma is basic viscous a high melting point with a high percentage of silica.
Because of the relatively low silica content and high temperature basaltic magmas have the lowest viscosity of all magma types meaning that they are thinner and more free flowing although it is still usually between 15 000. It is usually only exposed at the surface after uplift and erosion have occurred. Granitic or rhyolitic magmas and andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere the outer layer of earth composed of the crust and upper mantle is subducted so that its edge is positioned below the edge of the continental plate or. The silica content of basaltic magmas is between 45 and 55 percent which is lower than any other magma type.
Granitic magma is basic viscous a high melting point with a high percentage of silica.
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