EOSC 110 Lecture Notes - Lecture 8: Metamorphism, Microsoft Onenote, Gneiss

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13 Jan 2017

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Metamorphic Rocks

Monday,October10,2016 1:02AM

Metamorphism:processesofmineralogical&texturalchangethatoccurinarock

whenitissubjectedto:

Pressure

Temperature

Fluidcondions

diﬀerentthanthosewhentheparentrockwasformed

Parentrock:originalrockbeforemetamorphism

Metamorphic:changeinform

Pressureandtemperaturecondionsabovethoseofsedimentarylithiﬁcaonand

belowthoseofmelng

ForcesthatDriveMetamorphism:

1.Changesintemperature

Averagegeothermalgradient:25°C/kmdepth

Geothermalgradient:theamountofincreaseintemperaturewithdepthinEarth

2.Changesinpressure

a.Lithostacpressure



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