What Is A Granitic Magma

The emplacement of granitic magma within the continental crust marks the final stage in the granite forming process.

What is a granitic magma.

Stoping where the granite cracks the wall rocks and pushes upwards as it removes blocks of the overlying crust. Emplacement is defined here as the switch from upward to horizontal flow and. When magmas are judged by mineral composition like this they are technically referred to as felsic which is granitic and mafic which is basaltic. Granitic magma must make room for itself or be intruded into other rocks in order to form an intrusion and several mechanisms have been proposed to explain how large batholiths have been emplaced.

Granitic magma has high levels of potassium and sodium while basaltic magma has very low levels of these minerals. The fracture network in granitic magmas consists of through going backbone mafic and silicic composite dykes and smaller dangling granitic dykes locally generated in the magma chamber. The interval of the same color curves is the variation of the particle settling velocity in the corresponding. 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.

Other articles where granitic magma is discussed. Granitic magmas commonly ascend tens of kilometres from their source terranes to upper crustal emplacement levels or to the earth s surface. Apart from its obvious bearing on the interpretation of the geology and geochemistry of felsic igneous rocks the magma ascent mechanism critically affects any modelling of the metamorphic evolution of the upper lithosphere as well as its rheology. A good deal of research has shown that dyking is the only viable mechanism by which granitic magmas can be transported vertically through large thicknesses of crust to allow high level emplacement of magma in a largely liquid state clemens and mawer 1992 clemens 1998 petford et al 1993 mcnulty et al 1996 baker 1998 de saint.