Geothermobarametry Gibbs-Duhem equation describes how T and P changes affect free energy (as chemical potential) Reaction with big DSR change a good barometer,

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Presentation transcript:

Geothermobarametry Gibbs-Duhem equation describes how T and P changes affect free energy (as chemical potential) Reaction with big DSR change a good barometer, reaction with a big DVR change a good thermometer…. Clausius-Clapeyron

Thermobarometry reactions Exchange Reactions - For solid solution series (Fe-Mg in olivine or pyroxene for example) T and P control the equilibrium distribution Solvus thermometry – For minerals that exsolve, T at which 1 phase splits to 2 components dtermined by chemistry of the 2 components Trace element substitution into a certain mineral is T/P dependent (KD changes with T and P!) Isotope distributions in minerals are also T/P dependent

Exchange thermometers Minerals Elements garnet-biotite Fe-Mg garnet-cordierite garnet-clinopyroxene garnet-orthopyroxene garnet-hornblende garnet-olivine olivine-spinel two Fe-Ti oxides (e.g., ilmenite-magnetite) Fe-Ti Common thermometers Minerals Elements quartz-rutile Ti (in quartz) zircon-rutile Ti (in zircon), Zr (in rutile) hornblende-plagioclase Na-Ca quartz-magnetite oxygen isotopic ratio calcite-quartz, calcite-graphite carbon isotopic ratio Solvus thermometers Minerals Elements calcite-dolomite Ca-Mg clinopyroxene-orthopyroxene Ca-Mg/Fe plagioclase-alkali feldspar K-Na muscovite-paragonite monazite-xenotime Ce-Y

Barometers Net transfer barometers Assemblage Acronym(s) Assemblage Acronym(s) garnet-Al2SiO5-quartz-plagioclase GASP, GPAQ garnet-rutile-Al2SiO5-ilmenite-quartz GRAIL garnet-rutile-ilmenite-plagioclase-quartz GRIPS garnet-plagioclase-muscovite-biotite* GPMB garnet-plagioclase-hornblende-quartz GPHQ garnet-plagioclase-orthopyroxene-quartz garnet-plagioclase-clinopyroxene-quartz garnet-omphacite-kyanite-quartz/coesite (+/- phengite) K-feldspar-jadeite-quartz garnet-cordierite-sillimanite-quartz

Garnet-Biotite Geothermometer From Selverstone,: http://serc.carleton.edu/files/NAGTWorkshops/petrology/teaching_examples/Selverstone_thermobarometry.pdf

Garnet-Plagioclase-Kyanite-Quartz barometer