METAPELITIC REACTIONS AND FACIES

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Presentation transcript:

METAPELITIC REACTIONS AND FACIES

Metapelitic Zones

Metapelitic Zones and Facies

Aluminosilicate Minerals and Metamorphic Facies

Greenschist Facies – Chlorite and Biotite Zones

Chlorite Zone Assemblage – Lower Greenschist Facies

Reaction Controlling the Transition from the Chlorite Zone to the Biotite Zone (Upper Greenschist Facies)

Biotite-in Reaction (2) Chlorite

Compositional Changes in the Biotite Zone Increasing Grade In principle, chloritoid can form by reaction between chlorite and pyrophyllite but this is rarely observed

Chloritoid-in Reaction (3)

Garnet Zone (Transitional Between Greenschist and Amphibolite Facies)

Garnet-in Reaction (4) Garnet

Amphibolite Facies – Staurolite, Kyanite and Sillimanite Zones

Staurolite-in Reaction (5)

Chloritoid-out Reaction (6)

Staurolite-in Reaction (7)

Staurolite-out Reaction (10)

Granulite Facies A K F Sillimanite + Qtz K-feldspar Muscovite

Sillimanite-K-Feldspar-in Reaction (11) Muscovite + Qtz K F K-feldspar Sill-Kfs

Granulite Facies Grt-CrD