Metamorphic Rocks Formed From Granite

The original rock is subjected to heat temperatures greater than 150 to 200 c and pressure 100 megapascals 1 000 bar or more causing profound physical or chemical change the protolith may be a sedimentary igneous or existing metamorphic rock.

Metamorphic rocks formed from granite. Metamorphic rocks form when rocks are subjected to high heat high pressure hot mineral rich fluids or more commonly some combination of these factors. Consider how granite changes form. In order to create metamorphic rock it is vital that the existing rock remain solid and not melt. If there is too much heat or pressure the rock will melt and become magma.

In migmatite you can see metamorphic rock that has reached the limits of metamorphism and begun transitioning into the igneous stage of the rock cycle. The preexisting rocks may be igneous sedimentary or other metamorphic rocks. The end product of their metamorphism is a banded rock with a mineralogical composition like granite. Metamorphic rocks started out as some other type of rock but have been substantially changed from their original igneous sedimentary or earlier metamorphic form.

Granite gneiss can also form through the metamorphism of sedimentary rocks. The rock on the left is formed from cooled magma. Some form during mountain building by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism. This will result in the formation of an igneous rock not a metamorphic rock.

Metamorphic rock any rock that results from the alteration of preexisting rocks in response to changing conditions such as variations in temperature pressure and mechanical stress and the addition or subtraction of chemical components. These are the rocks that form by the effects of heat pressure and shear upon igneous and sedimentary rocks. The rock on the left formed from granite. A photograph of polished gneiss from the stock of a countertop vendor.

Granite is not metamorphic but an intrusive igneous rock formed from cooling magma. Metamorphic rocks are an important topic in geology. The granitic rock in migmatite probably originated from partial melting of some of the metamorphic rock though in some migmatites the granite may have intruded the rock from deeper in the crust. These are two metamorphic rocks.

Which statement about the rocks is accurate. The rock on the right is foliated. The rock on the right has randomly arranged grains.