Metamorphism

Metamorphism is the solid-state recrystallization of pre-existing rocks due to changes in physical and chemical conditions, primarily heat, pressure, and the introduction of chemically active fluids. Mineralogical, chemical and crystallographic changes can occur during this process. Changes at or just beneath Earth's surface due to weathering and/or diagenesis are not classified as metamorphism.

Three types of metamorphism exist: contact, dynamic and regional. Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism. Conversely, decreasing temperatures and pressure characterize retrograde metamorphism.

Read more about Metamorphism:  Limits of Metamorphism, Classification of Metamorphic Rocks, Prograde and Retrograde Metamorphism

Other articles related to "metamorphism":

Shock Metamorphism
... Shock metamorphism or impact metamorphism describes the effects of shock-wave related deformation and heating during impact events ...
Kambalda Type Komatiitic Nickel Ore Deposits - Metamorphic Overprint - Prograde Metamorphism
... Prograde metamorphism to either greenschist facies or amphibolite facies tends to revert igneous olivine to metamorphic olivine, serpentinite or talc carbonated ultramafic schists ... In the ore environment, the metamorphism tends to remobilise the nickel sulfide which, during peak metamorphism, has the yield strength and behaviour of toothpaste as conceptualised by workers within the field ... While sulfide minerals do not change their mineralogy during metamorphism as silicates do, the yield strength of the nickel sulfide pentlandite, and copper sulfide ...
Lachlan Fold Belt - Characteristics - Metamorphism
... There are two high temperature low pressure regions of metamorphism ... Blueschist formed by intermediate to high pressure metamorphism is found in melange at Port Sorell and the Arthur Lineament in Tasmania, and Howqua ...
Geology Of The Australian Capital Territory - Geological History - Devonian
... During this stage metamorphism occurred ... In the Canberra Graben and Cullarin Block, metamorphism mostly reached the upper Greenschist stage, with shallow burial and temperature below 350°C ... More intense metamorphism occurred to the east of the Googong Dam, east of the ACT on the Molonglo Range and Yarrow Peak and Taliesin Hills ...
Prograde and Retrograde Metamorphism
... Metamorphism is further divided into prograde and retrograde metamorphism ... Prograde metamorphism involves the change of mineral assemblages (paragenesis) with increasing temperature and (usually) pressure conditions ... Prograde metamorphism results in rock characteristic of the maximum pressure and temperature experienced ...