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METAMORPHIC-LECTURE 2 - Coggle Diagram
METAMORPHIC-LECTURE 2
Garnet zone
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Grt increases, chl decreases. Chl has more H2O, so dehydration reaction
Stonehaven zone
Garnet zone
Grt+bt+chl, also see grt+chl+ctd
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Staurolite zone
Discontinuous: ctd+chl=sta+bt, then ctd=sta+grt
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Staurolite zone
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Evolution: bt+chl, grt+bt+chl, sta+bt+chl, sta+bt, grt+sta+bt
Kyanite zone
Al-rich rocks, discontinuous reaction: sta+chl+musc=ky+bt
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Sta-chl tie-line breaks, chl then disappears
Sillimanite zone
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Sill+sta+bt+/-gr, start to lose sta
2 ways of formation
Second dill isograd. Discontinuous reaction: musc+qtz=sill+kfs, musc broke down, occurs at higher T(>600-650°C)
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Barrows zone
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Zones: divariant, isograd: univariant and divariant