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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 l.jpg
Ab-An Binary vs. Water Pressure

Johannes, 1978; Morse, 1980

Hypersolvus vs subsolvus granites l.jpg
Hypersolvus vs. Subsolvus Granites

Yoder et al., 1957; Morse, 1970

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An-Ab-Kfsp Ternary - Flattened

An-Kfsp Binary

Ab-Kfsp Binary

An-Ab Binary

Nekvasil & Lindsley, 1990; Brown, 1993

Intersection of liquidus surfaces l.jpg
Intersection of Liquidus Surfaces

Temperature falls

from E toward M

in Thermal Valley

Slide5 l.jpg

An-Ab-Kfsp Perspective

Solvus or Miscibility Gap

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Feldspar Tielines

Rhyolite Pumice


Smith & Carmichael, 1969; Fuhrman & Lindsley, 1988; Best et al., 1995

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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.

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Granitic System Liquid Line of Descent

Initial Bulk Composition

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Thermal Stability of Volatile Minerals

thermal energy + volatile-rich

mineral = volatile-free or

volatile-poor mineral(s) +

volatile fluid

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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.