Is Granite A Plutonic Intermediate Rock

There are about a dozen major plutonic rock types and many more less common ones.

Is granite a plutonic intermediate rock. Although there are many rocks that resemble granite they are not all true granites. Principal textures generally massive hypidiomorphic granular sometimes porphyritic. In igneous petrology an intermediate composition refers to the chemical composition of a rock that has 52 63 wt sio 2 being an intermediate between felsic and mafic compositions. Cumulate textures are rare.

Therefore plutonic rocks have coarse grained crystals. Applying this definition requires the mineral identification and quantification abilities of a competent geologist. Metallurgical contentgranitepegmatiteaplitegraphic granite greisensyenitenepheline syenite dioritegabbronoritediabaseperidotitedunite or olivine rockkimberlite or. Thus a representative plutonic rock would be granite while representative in turn of volcanic rock would be basalt besides the difference between the large crystals of the former and the microscopic crystals of the latter they contrast markedly in color.

Si saturated to oversaturated. Granodiorite is a plutonic igneous rock formed by intrusion of silica rich magma which cools in batholiths or stocks below the earth s surface. Differences between plutonic and volcanic rocks are more complex and more revealing of the geological evolution of the earth. It is usually only exposed at the surface after uplift and erosion have occurred.

The name for a particular plutonic rock depends on the mix of minerals in it. Most common batholiths are quartz diorite tonalite granodiorite granite. In ascending order four types include gabbro dark in color not much silica diorite an intermediate amount of silica granite 68 percent silica and pegmatite. Mineralogically granite contains quartz various feldspars and micas.

Pluton is the term used to describe a mass of plutonic rock. The name comes from two related rocks to which granodiorite is an intermediate. Plutons range in. Felsic plutonic rocks granitoids characteristics.

Typical intermediate rocks include andesite dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks. Depending on their silica content they are called in ascending order of silica content gabbro diorite granite and pegmatite. A good example is granite which is a very hard plutonic rock. Granite is a plutonic rock in which quartz makes up between 10 and 50 percent of the felsic components and alkali feldspar accounts for 65 to 90 percent of the total feldspar content.

By quantity these are the by far most common rock types.