Petrology Chapter 3Gautam Sen

Stability of Diamond & Graphite

Free energy – composition of Olivine

Al2SiO5 Equilibrium

Silica polymorphs

Mole vs. Wt%

Equilibrium crystallization of Olivine

Fractional Crystallization of Olivine

Plagioclase Zoning

Melt mixing

Diopside-Anorthite “System”

Enthalpy-Composition

Equilibrium crystallization in Di-An

Fractional Melting in Di-An

Nepheline-Silica system

Liquidus – solidus near-convergence of peridotite

Forsterite-Silica System

Crystal%, phases, and cooling

Superheat due to Melt Mixing

Fractional Melting in Fo-SiO2

Albite-Orthoclase system at low pressure (shallow continental crust)

Albite–Orthoclase System at higher pressure (moderate – deep crust)

Fo-H2O

Multisaturation & Isoplethal Diagram

Effect of H2O on Di-An

Pressure effect

Effect of H2O on Fo-Silica System