At a higher yet, minerals and are no longer stable together. Show/explain how you can a x use the chemographics to determine the approximate (unbalanced) reaction involved with this isograd #2 (assuming that mineral does not become stable until higher grades). y Balance the reaction. Why might isograd #2 make a poor field-based (first appearance of a mineral) isograd? Why might some rocks show no evidence of the reaction? Be specific and refer to your diagram. What would you name isograd #2 and the zone above it? Why?
At a higher yet, minerals a and x are no longer stable together. Show/explain how you can use the chemographics to determine the approximate (unbalanced) reaction involved with this isograd #2 (assuming that mineral y does not become stable until higher grades). Balance the reaction. Why might isograd #2 make a poor field-based (first appearance of a mineral) isograd? Why might some rocks show no evidence of the reaction? Be specific and refer to your diagram. What would you name isograd #2 and the zone above it? Why?
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