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T conditions - PowerPoint PPT Presentation

Stable mineral assemblages

Stable mineral assemblages. At equilibrium. Phase rule: F=C-P+2 F=degrees of freedom (T, P) C=components (chemical constituents) P=phases For equilibrium, # phases = or < than # components. Liquid. Plagioclase. plus. Liquid. Plagioclase. Phase rule. Phases < C

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1.09k views • 31 slides

Geol 2312 Igneous and Metamorphic Petrology

Geol 2312 Igneous and Metamorphic Petrology. Lecture 23 Stable Mineral Assemblages in Metamorphic Rocks. March 30, 2009. Equilibrium Mineral Assemblages. Evidence of Chemical Equilibrium Lack of disequilibrium textures (replacement textures, corona, compositional zoning, ....)

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595 views • 18 slides

Aluminosilicate Minerals

Aluminosilicate Minerals. SILLIMANITE : Orthorhombic: Octahedral Al chains (6-fold) are crosslinked by both Si and Al tetrahedra (4-fold). ANDALUSITE : Orthorhombic: 5-coordinated Al; Same octahedral (6-fold) chains. KYANITE : Triclinic: All the Al is octahedrally coordinated (6- and 6-fold). .

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797 views • 15 slides

Petrology Chapter-15

Petrology Chapter-15. Gautam S en. P-T conditions of metamorphism. Pressure. Confined pressure. Deviatoric stress. P-T conditions, plate tectonics, & metamorphism . Types of Metamorphism. Metamorphic textures. Soap bubble texture. Porphyroblasts in mica schist. Foliation development.

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274 views • 9 slides

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T conditions - PowerPoint PPT Presentation

Stable mineral assemblages

Geol 2312 Igneous and Metamorphic Petrology

Aluminosilicate Minerals

Petrology Chapter-15