What Is Granitic Magma

Other articles where basaltic magma is discussed.

What is granitic magma.

A common coarse grained light colored hard igneous rock consisting chiefly of quartz orthoclase or microcline and mica used in monuments and for building. Granitic magma has high levels of potassium and sodium while basaltic magma has very low levels of these minerals. A crystal of imperial topaz on an albite matrix from a pocket in the katlang pegmatite of pakistan. The mantle rocks located at depths from about 70 to 200 kilometres are believed to exist at temperatures slightly above their melting point and.

A will of granite. We use cookies to ensure that we give you the best experience on our website. Basaltic magmas that form the oceanic crust of earth are generated in the asthenosphere at a depth of about 70 kilometres. If you continue to use this site we will assume that you are happy with it.

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. Italian granito from past participle of granire to make grainy from grano grain from latin grānum. Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral. I type granites are a category of granites originating from igneous sources first proposed by chappell and white 1974.

They are recognized by a specific set of mineralogical geochemical textural and isotopic characteristics that indicate for example magma hybridization in the deep crust i type granites are saturated in silica but undersaturated in aluminum. 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 is a light colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below earth s surface.

Specimen is about 4 5 x 3 5 x 3 5 centimeters. Petrographic features are. The specimen shown here is about two inches five centimeters across. 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.