Common thermobarometers
Exchange thermometers | |
Minerals | Elements |
garnet-biotite | Fe-Mg |
garnet-cordierite | Fe-Mg |
garnet-clinopyroxene | Fe-Mg |
garnet-orthopyroxene | Fe-Mg |
garnet-hornblende | Fe-Mg |
garnet-olivine | Fe-Mg |
olivine-spinel | Fe-Mg |
two Fe-Ti oxides (e.g., ilmenite-magnetite) | Fe-Ti |
Solvus thermometers | |
Minerals | Elements |
calcite-dolomite | Ca-Mg |
clinopyroxene-orthopyroxene | Ca-Mg/Fe |
plagioclase-alkali feldspar | K-Na |
muscovite-paragonite | K-Na |
monazite-xenotime | Ce-Y |
Other 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 |
Net transfer barometers | |
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 |
Other barometers |
Assemblage/Mineral |
Si in phengite if phengite in equilibrium with K-feldspar + Mg-biotite + quartz |
Al in hornblende if hornblende in equilibrium with quartz + K-feldspar + plagioclase + biotite + magnetite or ilmenite + titanite + melt/fluid (oxygen fugacity and T should also be known) |
Al in orthopyroxene |
Magmatic epidote in calc-alkaline igneous rocks |
Si and Al+Cr in majorite garnet |
* Other variations involving garnet, muscovite and/or biotite, plagioclase, quartz, ± Al2SiO5 are also barometers.