Answer: retrograde
The transformation of high-grade metamorphic rocks into low-grade metamorphic rocks is termed ________ metamorphism.
Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means "change in form". The original rock (protolith) 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 make up a large part of the Earth's crustand form 12% of the Earth's land surface. T…
Gneiss - Wikipedia
Metamorphic rock - Wikipedia
Metamorphic rock - Wikipedia
Holmquist 1916 called the process whereby metamorphic rocks are transformed into granulite 'anatexis'. The segregation of melt during the prograde part of the metamorphic history (temperature > solidus) involves separating the melt fraction from …
Metamorphism is the change of minerals or geologic texture in pre-existing rocks without the protolith melting into liquid magma. The change occurs primarily due to heat pressure and the introduction of chemically active fluids. The chemical components and crystal structures of the minerals making up the rock may change even though the rock remains a solid. Changes at or just beneath Earth's surface due to weathering or diagenesis are not classified as metamorphism . Metamorphism …
Thu Jan 27 2005 13:30:00 GMT-0500 (Eastern Standard Time) · Serpentinite is a rock composed of one or more serpentine group minerals the name originating from the similarity of the texture of the rock to that of the skin of a snake. Minerals in this group which are rich in magnesium and water light to dark green greasy looking and slippery feeling are formed by serpentinization a hydration and metamorphic transformation of ultramafic rock from ...
Gneiss is a common and widely distributed type of metamorphic rock . Gneiss is formed by hi...
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