Geothermobarometry

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Geothermobarometry
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Partioning of Fe, Mg with Temperature The
Garnet-Biotite Geothermometer
Fe, Mg have similar ionic radii, therefore volume
change small
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The Garnet-Biotite Exchange Geothermometer
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Garnet-Biotite Geothermometer Calibration
(Ferry and Spear, 1978)
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Garnet Biotite Geothermometer
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The GASP Geobarometer
V LHS 3 x 100.7 300.21 cm3
DV - 66.08 cm3
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The GASP Geobarometer
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Other Geobarometers
Sphalerite
GRIPS
FeS content of Sph in equilibrium with Py and Po
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Application of Garnet-Biotite and GASP
Geothermobarometry
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Application of Multiple Geothermobarometers
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P-T-t path application Garnet-Biotite/GASP
Geothermobarometry
Sample from the Wopmay Orogen (St Onge, 1987)
Gt-Bt Hodges and Spear, 1982). GASP Koziol
(1988)
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Solvus geothermometers
Alkali feldspar geothermometer
Calcite geothermometer
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Oxygen Isotope Geothermometry
Oxygen isotope fractionation factors
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P-T Conditions at Balmat
Balmat