Metamorphic Facies Best, Chapter 10.

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Presentation transcript:

Metamorphic Facies Best, Chapter 10

Metamorphic Grade Controlled by the temperature of metamorphism Low-grade rocks contain hydrated and carbonated phases High-grade rocks are dehydrated and decarbonized

Metamorphic Zones Mappable metamorphic units of similar grade in a rock of distinct composition Isograds are lines marking the first appearance of key minerals Zones of Barrow Biotite, garnet, staurolite, kyanite, sillimanite

Metamorphic Reactions Formation of talc in a siliceous dolomite Dol + Qtz + H20 = Tlc + Cal + C02 Controlled by the ratio of H20/ C02

Metamorphic Facies The set of mineral assemblages occurring in rocks of diverse composition Facies develop under restricted P,T conditions Mineral assemblages may be plotted on ACF diagrams

Main Facies Zeolite Prehnite-pumpellyite Blueschist Greenschist Amphibolite Granulite Eclogite

Review of Facies Mineral assemblages in metamorphosed mafic rocks Correlation of Barrow’s zones with facies from different protoliths P, T diagram for various facies