Garnet–orthopyroxene geothermometry and geobarometry: error propagation and equilibration effects |
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| Authors: | CJ CARSON & R POWELL |
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| Institution: | School of Earth Sciences, The University of Melbourne, Parkville, 3052, Australia |
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| Abstract: | Garnet–orthopyroxene geothermometry and geobarometry are widely used in high-grade metamorphic terranes. These techniques may provide an insight into pressure–temperature ( P–T ) paths followed by such terranes, provided various sources of uncertainty are taken into consideration. Analytical uncertainties, particularly with regard to their effect on ferric iron estimation in orthopyroxene, can contribute to the overall uncertainty on the calculated P–T . Additionally, retrograde cation diffusion can affect the Fe–Mg distribution between coexisting garnet and orthopyroxene, consequently affecting P–T estimates. Recognizing the importance of these effects, and care with both the choice of the grains analysed and analytical techniques, may lead to more reliable P–T estimation. |
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| Keywords: | diffusive equilibration error propagation ferric iron estimation garnet–orthopyroxene geothermometry/barometry |
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