Ch. 8 notes GEOL.docx - April 30th Metamorphism – to change...

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April 30thMetamorphism– to change form. The transition of one rock into another bytemperatures and/or pressures unlike those in which it formedProtolith– aka parent rock1. Heata.Most important agenti.Recrystallization forms new stable mineralsb.There’s 2 forms of heati.Geothermal gradient – an increase in temp with depth(25*C/kilometer)ii.Contact metamorphism – rising mantle plumes2. Pressurea.Confining Pressurei.Forces are appliedequallyin all directionsii.Causes spaces between mineral grains to closeb.Differential Stressi.Forces areunequalin different directions1.Stresses in one direction are greaterii.Compressional stress1.Shortened in one direction and elongated in theother direction3.Chemically Active Fluidsa.Enhances migration of ionsb.Aids in recrystallization of existing mineralsc.Sources of fluids:i.Porespaces od sedimentary rocksii.Fracturesin igneous rocksiii.Hydratedmineralssuch as clay and micasAgents of MetamorphismThe importance of

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Term
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Swanson
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