What Is Granitic Magma

Italian granito from past participle of granire to make grainy from grano grain from latin grānum.

What is granitic magma.

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. If you continue to use this site we will assume that you are happy with it. Specimen is about 4 5 x 3 5 x 3 5 centimeters. The parental granitic magma underwent the mixing of mantle derived mafic magma and crustal felsic magma coupled with fractional crystallization during magma ascent before emplacement.

Granite definition a coarse grained igneous rock composed chiefly of orthoclase and albite feldspars and of quartz usually with lesser amounts of one or more other minerals as mica hornblende or augite. Basaltic magmas that form the oceanic crust of earth are generated in the asthenosphere at a depth of about 70 kilometres. When magmas are judged by mineral composition like this they are technically referred to as felsic which is granitic and mafic which is basaltic. Petrographic features are.

It forms from the slow crystallization of magma below earth s surface. Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter. A will of granite. Other articles where basaltic magma is discussed.

I type granites are a category of granites originating from igneous sources first proposed by chappell and white 1974. A common coarse grained light colored hard igneous rock consisting chiefly of quartz orthoclase or microcline and mica used in monuments and for building. The specimen shown here is about two inches five centimeters across. A crystal of imperial topaz on an albite matrix from a pocket in the katlang pegmatite of pakistan.

Other articles where granitic magma is discussed. Granitic magma has high levels of potassium and sodium while basaltic magma has very low levels of these minerals. We use cookies to ensure that we give you the best experience on our website. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.