CHEM 1223A

kharv [at] umd [dot] edu

Sarah Penniston-Dorland

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I am interested in trace-element geochemistry and its applications in metamorphic petrology to study rheological and tectonic processes in subduction zones. Currently, I am investigating two major questions about subduction channel dynamics, using the Catalina Schist, California, as a type example: how does the rheology of the subduction channel change during metamorphism, and why do Catalina Schist rocks preserve higher temperatures than expected for a subduction zone. My methods include Zr-in-rutile and/or titanite thermometry, U-(Th)-Pb geochronology of rutile and/or titanite, and geoba-"raman"-try.

Harvey, K.M., Penniston-Dorland, S.C., Kohn, M.J., Piccoli, P.M. (2020) Assessing P-T variability in melange blocks from the Catalina Schist: Is there differential movement at the subduction interface?. Journal of Metamorphic Geology. DOI: 10.1111/jmg.12571

Harvey, K.L., Walker, S., Starr, P.G., Penniston-Dorland, S.C., Kohn, M.J., Baxter, E.F. (2021) A Mélange of Subduction Ages: Constraints on the Timescale of Shear Zone Development and Underplating at the Subduction Interface, Catalina Schist (CA, USA). Geochemistry, Geophysics, Geosystems. 22(9) DOI: 10.1029/2021GC009790