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Unformatted text preview: the textural relations VI- Protolith VII- Rock Name: list the essential minerals in the "reverse" order of abundance, and attach a "textural" term (e.g. "sillimanite garnet biotite gneiss" indicates that the modal content of biotite is greater than that garnet, which in turn is greater than that of sillimanite. VII- Chemographic representation of the phase relations: Plot the mineral assemblage(s) on the appropriate projection. Identify the "equilibrium" or "peak" assemblage. VIII- Inferred reactions IX- Facies and Metamorphic Grade : in addition to any information on the P-T conditions of formation of the studied sample and its P-T history (inferred from the textural relations, metamorphic reactions, . ..etc.). X- Mode of formation, relationship to other samples,. .. etc....
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- Fall '11
- Metamorphic rocks, gneiss, Schist