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Ab-An Binary vs. Water Pressure

Ab-An Binary vs. Water Pressure. Johannes, 1978; Morse, 1980. Hypersolvus vs. Subsolvus Granites. Yoder et al., 1957; Morse, 1970. An-Ab-Kfsp Ternary - Flattened. An-Kfsp Binary. Ab-Kfsp Binary. An-Ab Binary. Nekvasil & Lindsley, 1990; Brown, 1993. Intersection of Liquidus Surfaces.

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Ab-An Binary vs. Water Pressure

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  1. Ab-An Binary vs. Water Pressure Johannes, 1978; Morse, 1980

  2. Hypersolvus vs. Subsolvus Granites Yoder et al., 1957; Morse, 1970

  3. An-Ab-Kfsp Ternary - Flattened An-Kfsp Binary Ab-Kfsp Binary An-Ab Binary Nekvasil & Lindsley, 1990; Brown, 1993

  4. Intersection of Liquidus Surfaces Temperature falls from E toward M in Thermal Valley

  5. An-Ab-Kfsp Perspective Solvus or Miscibility Gap

  6. Feldspar Tielines Rhyolite Pumice Trachybasalt Smith & Carmichael, 1969; Fuhrman & Lindsley, 1988; Best et al., 1995

  7. An-Ab-Kfsp Ternary Liquid Line of Descent

  8. Water Saturated Granite System

  9. Effect of Pressure and Granite Modes

  10. Origin of Granitoids • Phase equilibria support either that granitoids are either the end product of fractional crystallization of a mafic parent or the partial melt generated from the melting of sialic crust - large corresponding extrusive equivalents suggests large magma chambers of equivalent composition. • Field relations suggest that large plutons have diffuse boundaries and many seem to show variable and locally pervasive overprint of subsolidus recrystallization indicative of metamorphic origin.

  11. Granitic System Liquid Line of Descent Initial Bulk Composition

  12. Pyroxene Quadrilateral

  13. Mica and Amphibole - Melt Equilibria Wones & Eugster, 1965

  14. Thermal Stability of Volatile Minerals thermal energy + volatile-rich mineral = volatile-free or volatile-poor mineral(s) + volatile fluid

  15. Assessing States of Equilibrium Disequilibrium states are suggested by the following: • Isolated anhedral grains that resulted from partial resorption or dissolution into the melt • Reaction rims of one or more phases surrounding another anhedral crystalline phase. • Compositionally zoned grains originate through incomplete reaction relations within a single solid solutions, e.g. plagioclase. • Presence of minerals or a mineral assemblage that is known to be unstable or unlikely in an evolutionary sense, e.g. Mg-olivine and qtz together.

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