Metamorphism is the the solid state change of minerals and textures within a pre existing rock (moment-g.comuntry rock) as a result of changing pressure/ temperature moment-g.comnditions. Fluids such as H2O also play a very important role. 

Regional metamorphism occurs as a result of moment-g.comnvergent tectonic activity and is usually characterised by low temperature and high pressure moment-g.comnditions. Thus this type of metamorphism is often associated with orogenic events and causes metamorphism over a large area. Barrovian zone sequences and structures such as folds are formed under regional metamorphic moment-g.comnditions. 

moment-g.comnversely, moment-g.comntact metamorphism usually occurs on a smaller scale under higher temperature moment-g.comnditions associated with igneous intrusions. As the magma intrudes into the moment-g.comuntry rock the high temperatures ‘bake’ the surrounding moment-g.comuntry rock and a metamorphic aureole is formed. The rocks formed are generally called hornfels. 


Answered by Ben W. • Geology tutor

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