105-16 9-30 Absolute rock dating, metamorphic rx

It may have started off as a sediment of mud or clay

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Unformatted text preview: off as a sediment of mud or clay, which later become a sedimentary rock such as mudstone or shale … Erosion Where igneous, sedimentary and metamorphic rocks form … Earth temperatures and pressures increase downwards (but the rate of temperature increase is related to the tectonic nature of the lithosphere) Types of Metamorphism • Contact metamorphism — rocks within the crust that are intruded by magma are recrystallized by the magma’s high temperatures; commonly not foliated • Regional metamorphism — as rocks are buried deeper and deeper within the earth they encounter increasingly higher pressures (confining = lithostatic) and temperatures, which result in their recrystallization; the directed pressures (stresses) produce planar structures called foliation. Rock...
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