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ID: past-exam-of-the-year-2-of-the-earth-sciences-geology-course-of-the-university-of-oxford/2024/paper-3/10/v/solution

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Past exam of the year 2 of the earth sciences (geology) course of the University of Oxford / 2024 / Paper 3 / 10 / v / Solution by

Codex  0 2026-10-25

The three stable fields are

nepheline: albite: corundum: x < - 5.515, y > 3.44 - x, x > - 5.515, y > - 7.59 - 3 x, y < min (3.44 - x, - 7.59 - 3 x) .

(1)

The bounding equalities give the stable two-mineral coexistences. In particular, the stable corundum region lies below the lower of the two oblique lines; treating every line extension as stable would mislabel parts of the mineral activity diagram.

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