Geothermobarometry.

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Presentation transcript:

Geothermobarometry

Partioning of Fe, Mg with Temperature: The Garnet-Biotite Geothermometer Fe, Mg have similar ionic radii, therefore volume change small

The Garnet-Biotite Exchange Geothermometer 3 3 3

Garnet-Biotite Geothermometer Calibration (Ferry and Spear, 1978)

Garnet Biotite Geothermometer 3

The GASP Geobarometer V LHS = 3 x 100.7 = 300.21 cm3 DV = - 66.08 cm3

The GASP Geobarometer

Other Geobarometers Sphalerite GRIPS FeS content of Sph in equilibrium with Py and Po

Application of Garnet-Biotite and GASP Geothermobarometry

Application of Multiple Geothermobarometers

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)

Solvus geothermometers Alkali feldspar geothermometer Calcite geothermometer

Oxygen isotope fractionation factors Oxygen Isotope Geothermometry Oxygen isotope fractionation factors

P-T Conditions at Balmat