Where Do We See Granitic Magma

Even under the intense pressures found there.

Where do we see granitic magma. Could granitic magmas be formed directly from the upper mantle. Magma molten or partially molten rock from which igneous rocks form. We know that ion differentiation can occur in the mantle. Origin of granitic magma most granitic or rhyolitic magma appears to result from wet melting of continental crust.

When granitic magma erupts from volcanoes it does so very explosively indicating high gas content. Most granites and rhyolites are found in areas of continental crust. Suspended crystals and fragments of unmelted rock may be. Pluton has been used to describe any non tabular intrusive body and batholith.

Beneath the central portions of the continental cratons. Magma migrates either at depth or to earth s surface and is ejected as lava. Where we do see rare evidence for arrested fluid absent partial melting the melt fraction is invariably concentrated into small shear zones veinlets and small dykes. Thus a body of magma evolves as it cools and also as it moves through the crust interacting with other rocks.

It usually consists of silicate liquid although carbonate and sulfide melts occur as well. As it cools magma crystallizes into a series of minerals some of which crystallize sooner than others. As the minerals crystallize they leave the remaining magma with a changed chemical composition. Thus it seems likely that dyking is important in transporting granitic magma on a variety of scales and at many crustal levels.

3 3 crystallization of magma the minerals that make up igneous rocks crystallize at a range of different temperatures. A batholith is much larger up to hundreds of km long and 100 km across and consists of many plutons that are similar in composition and appearance. If complete differentiation is what we are looking for. This explains why a cooling magma can have some crystals within it and yet remain predominantly liquid.

In geology a pluton is a body of intrusive igneous rock also called plutonic rock that is crystallized from magma slowly cooling below the surface of the earth although pluton is a general term to describe an intrusive igneous body there has been some confusion around the world as to the definition of a pluton.