Geothermobarometry
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Geothermobarometry. How do we know P and T?. Need min. at equilibrium. Good barometer rxn vs. good thermometer rxn Which has large D V and which has large D S?. D. dP. S. =. D. dT. V. Geothermobarometry.

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Geothermobarometry3 l.jpg

Need min. at equilibrium

Good barometer rxn vs. good thermometer rxn

Which has large DV and which has large DS?

D

dP

S

=

D

dT

V

Geothermobarometry


Good thermometer l.jpg

Measure distribution of elements in coexisting phases from experiments at known P and T

Estimate P and T of equilibrium in natural samples

Garnet-biotite exchange reaction

K: (Mg/Fe)Garnet

Good thermometer

(Mg/Fe)Biotite


Good thermometer5 l.jpg

K: (Mg/Fe experiments at known P and T)Garnet

Bigger K: Mg-rich garnet or Fe rich biotite

Smaller K: Mg-rich biotite or Fe-rich garnet

(Mg/Fe)Biotite

Good thermometer


Garnet biotite thermometer l.jpg
Garnet-biotite thermometer experiments at known P and T


Slide8 l.jpg

Ca experiments at known P and Tplag

  • The GASP geobarometer

  • Garnet, aluminosilicate, silica, plag

  • Large DV, shallow slope

  • K: Cagarnet


Slide9 l.jpg

Ca experiments at known P and Tplag

  • The GASP geobarometer

  • Garnet, aluminosilicate, silica, plag

  • Large DV, shallow slope

  • K: Cagarnet


How to apply l.jpg
How to apply? experiments at known P and T

  • Results of garnet-biotite thermometry and GASP barometry

  • 1 sample, different calibrations


Slide11 l.jpg


Slide12 l.jpg



Slide14 l.jpg


Calculated uncertainties from various potential sources l.jpg
Calculated uncertainties from various potential sources experiments at known P and T

  • Red: instrumental

  • Blue: total instrumental/mathematical/calibration

  • Yellow: natural heterogeneity

  • Dark green: uncertainty in the K experiments

  • Light green: combination of all uncertainty


Consider this reaction l.jpg
Consider this reaction: experiments at known P and T

  • 3 Anorthite -> Grossular + 2 kyanite + quartz

  • Low P -> High P


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