METAPELITIC REACTIONS AND FACIES

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METAPELITIC REACTIONS AND FACIES
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Metapelitic Zones
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Metapelitic Zones and Facies
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Aluminosilicate Minerals and Metamorphic Facies
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Greenschist Facies Chlorite and Biotite Zones
Greenschist facies
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Chlorite Zone Assemblage Lower Greenschist
Facies
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Reaction Controlling the Transition from the
Chlorite Zone to the Biotite Zone
(Upper Greenschist Facies)
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Biotite-in Reaction (2)
Biotite
Chlorite
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Compositional Changes in the Biotite Zone
Increasing Grade
In principle, chloritoid can form by reaction
between chlorite and pyrophyllite but this is
rarely observed
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Chloritoid-in Reaction (3)
Chloritoid
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Garnet Zone (Transitional Between Greenschist and
Amphibolite Facies)
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Garnet-in Reaction (4)
Garnet
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Amphibolite Facies Staurolite, Kyanite and
Sillimanite Zones
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Staurolite-in Reaction (5)
Staurolite
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Chloritoid-out Reaction (6)
Chloritoid
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Staurolite-in Reaction (7)
Staurolite
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Staurolite-out Reaction (10)
Staurolite
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Granulite Facies
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Sillimanite-K-Feldspar-in Reaction (11)
A
Sillimanite
Muscovite
Qtz
F
K
K-feldspar
Sill-Kfs
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Granulite Facies
Grt-CrD