5 Questions
What are the three defined metamorphic zones based on?
Presence of index minerals
What marks the boundary between each metamorphic zone?
Appearance or disappearance of an index mineral
What do Isograds mark in metamorphic zones?
First appearance of an index mineral
What does metamorphic grade describe?
Relative temperature and pressure conditions
What are Isograds defined by?
"Mineral in" and "mineral-out" isograds
Learn about the spatial variations and mineral assemblages in metamorphic terrains, and how they can be classified into different zones based on metamorphic grade. Understand the significance of identifying these zones in studying the tectonic history of an area.
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