Degrees

Ph.D, Virginia Tech (2017)
M.S., University of Montana (2012)
B.A., Middlebury College (2010)

Research Interests

I am a metamorphic geologist with a broad interest in tectonics, heat and mass transfer in modern plate boundaries and their ancient analogues, and the long-term evolution of Earth's continental crust. I study these processes by reading the geologic record preserved in metamorphic rocks.

Specifically, my research aims to elucidate processes at convergent plate margins (mountain belts, subduction zones) as recorded by exhumed metamorphic rocks in both modern and ancient settings, through the use and development of novel techniques to "reading" metamorphic rocks. I integrate field and microstructural observations, geochemical analysis, and various computational modelling techniques to quantify the depths, temperatures, paths, and timescales of metamorphism in the rock record. 

Some of the questions that my research addresses include:

• How are heat, mass, and fluids transferred in the lithosphere at active plate boundaries, and over what timescales do these processes occur?
• What were the tectonic mechanisms for extreme heating and stabilization of Earth's early continents? What signature do these processes imprint in the Archean metamorphic rock record?
• How are feedbacks between deep crustal melting and rapid surface erosion initiated in orogenic belts, and over what time- and length-scales do deep crustal and surficial processes influence each other?
• In what ways do metamorphic reactions control the occurrence of slow-slip earthquakes in subduction zones?

Teaching Interests

I teach Mineralogy (GEOL 271), Igneous and Metamorphic Petrology (GEOL 321), and Principles of Geology (GEOL 111).

Recent Publications

Hoover, W., Condit, C.B., Lindquist, P., Moser, A., and Guevara, V.E., Episodic slow slip hosted by talc-bearing metasomatic rocks: high strain rates and stress amplification in a chemically reacting shear zone. Geophysical Research Letters, 49, 21, DOI: 10.1029/2022GL101083

Guevara, V.E., Smye, A.J., Caddick, M.J., Searle, M.P., Olsen, T., Whalen, L., Kylander-Clark, A.R.C., Jercinovic, M.J., and Waters, D.J., A modern pulse of plate-velocity exhumation and diachronous crustal melting in the Nanga Parbat Massif. Science Advances, 8, 31, DOI: 10.1126/sciadv.abm2689

Cooperdock, E.H., Chen, C.Y., Guevara, V.E., and Metcalf, J.M. 2021. Addressing Systemic Bias in the Lab, Field, and Classroom. AGU Advances, 2, e2020AV000353. DOI: 10.1029/2020AV000353

Condit, C.B., Guevara, V.E., Delph, J.R., and French, M.E., 2020. Slab dehydration in warm subduction zones at depths of episodic slip and tremor. Earth and Planetary Science Letters, 552, 116601. DOI: 10.1016/j.epsl.2020.116601.

Guevara, V.E., MacLennan, S.A., Caddick, M.J., Schoene, B., Dragovic, B., Kylander-Clark, A.R.C., and Couëslan, C.G., 2020. Polyphase zircon growth during slow cooling from ultrahigh temperature: an example from the Archean Pikwitonei Granulite Domain. Journal of Petrology. DOI: 10.1093/petrology/egaa021

Guevara, V.E., Caddick, M.J., and Dragovic, B., 2017. Rapid high-temperature decompression recorded by Archean granulites of the northern Wyoming Province. Journal of Metamorphic Geology, 00, 1-23. DOI: 10.1111/jmg.12262

Dragovic, B., Guevara, V.E., Caddick, M.J., and Baxter, E.F., 2016. A pulse of cyptic granulite-facies metamorphism in the Archean Wyoming Craton revealed by Sm-Nd garnet and U-Pb monazite geochronology. Precambrian Research, 283, 24-49. DOI: 10.1016/j.precamres.2016.07. 010

Guevara, V.E. and Caddick, M.J., 2016. Shooting at a moving target: phase equilibria modeling of high temperature metamorphism. Journal of Metamorphic Geology, 34, 209-245. DOI:  10.1111/jmg.12179

Extramural Research Grants Awarded

National Science Foundation, NSF-EAR-221076 (2022-2025): Collaborative Research: Resolving Conflicting Thermobarometry and Stratigraphy in the Tethyan Himalaya: is Non-Lithostatic Pressure During Orogenesis Preserved at Crustal Scales? 

National Science Foundation, NSF-EAR-2120412 (2021-2023): Collaborative Research: Understanding the Tectonic and Petrological Processes Controlling Iron Oxide-Apatite Mineralization in a Mesoproterozoic Collisional Orogen 

National Science Foundation, NSF-EAR-2119843 (2021-2024): Collaborative Research: Probing feedbacks between thermal structure, petrologic transformation, and rheologic evolution within dynamically evolving subduction zones

Links

Personal Research Website: https://www.victoreguevara.weebly.com/