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METAMORPHIC-LECTURE 3 - Coggle Diagram
METAMORPHIC-LECTURE 3
Buchan zone
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Same rock as Barrow, different sequence of minerals, reactions and isograds
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Cordierite zone: bt+chl+crd, continuous reaction, chl decreases in abundance, crd+bt increases
chl+musc+qt=bt+crd+v. Continuous dehydration reaction
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Sillimanite zone: discontinuous polymorphic transition, and=sill. second sill isograd: sill+crd+bt+kfs, musc+qtz=kfs+sill+v
Ballachulish zone
Contact metamorphism of pelites, lower P
Different index minerals: crd, bt, kfs, and, melt
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In some K-Al richer pelites, musc persists and qtz reacts first. This gives silica-undersat pelites w/ corundum: musc=corundum+kfs+H2O
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