2019 Graduate Student Showcase

Title of Submission

Improving the Accuracy of Barometric Methods Used for Metamorphic Rocks with Raman Microspectroscopy

Degree Program

Geosciences, MS

Major Advisor Name

Matthew Kohn

Type of Submission

Scholarly Poster


Constraining pressure-temperature (P-T) histories of rocks is important for understanding tectonics. Most P-T path calculations invert mineral chemistry using equilibrium thermodynamic models. Recent studies questioned whether metamorphic minerals attain equilibrium. If so, many published P-T paths are wrong. An alternative approach for determining pressure evolution is via elastic thermobarometry of quartz inclusions in garnet. This approach relies on physical properties of minerals rather than the chemical evolution of rocks. I hypothesize that pressure changes calculated for rocks using chemically- and physically-based methods return indistinguishable results. I will verify my hypothesis using rocks from locations with previously published chemically-based P-T paths.

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