Basaltic Magma And Granitic Magma

Explain why basaltic and granitic magma behave differently as they rise toward earth s surface.

Basaltic magma and granitic magma.

Magma is a fluid of high temperatures or semi fluid with rock fragments formed within the earth s crust. Although granitic magmas can be formed through magmatic differentiation of andesitic magmas most granitic magmas probably form when hot basaltic magma ponds becomes trapped because of its greater density below continental crust figure 2. Granite is formed by the slow cooling of magma within the surface of the earth while basalt is formed when magma quickly cools after breaching the earth s surface through. Thus basaltic magmas tend to be fairly fluid low viscosity but their viscosity is still 10 000 to 100 0000 times more viscous than water.

Explain why basaltic magma and granitic magma behave differently as they rise toward earth s surface. Discuss earthquake mechanisms at the three types of tectonic plate boundaries. Fs show all show all steps. Magmas are with viscosity of 10 4 5 pa s scaillet et al 1998.

Note that solids even though they appear solid have a viscosity but it very. Step 1 of 4. 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. Describe the similarities and differences between the andes and the.

Basaltic magma is acidic fluid rich in iron and magnesium but poor in silica. Andesitic magma is. Basaltic magma is composed of sio2 45 55 wt high in fe mg ca low in k na. 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.

Granitic magma is basic viscous a high melting point with a high percentage of silica. For example h 2 o rich crystal poor and high silica. Rhyolitic magmas tend to have even higher viscosity ranging between 1 million and 100 million times more viscous than water. The viscosity of basaltic and granitic magma is largely distin guished.

Although basaltic magma can result in basaltic rocks and granitic magma can result in granitic rocks they can also form other rocks depending on how quickly the magma cools.