University of California, Riverside

Earth Sciences

Department of Earth Sciences

Maryjo Brounce

Maryjo Brounce

Assistant Professor

Ph.D. Oceanography University of Rhode Island Graduate School of Oceanography, 2014

Phone: (951) 827-3151
Office: Geology 1224B
Website: coming soon

Research Interests:

Geochemistry/igneous petrology/geological oceanography/volcanology

My interests are focused on understanding the composition and structure of the Earth, with a focus on chemical exchange between the deep interior, the crust, and the atmosphere and oceans of Earth. I use both land and oceanographic field studies, combined with a variety of analytical and experimental tools to probe the composition of sediments and volcanic rocks to place constraints on mechanisms of plate tectonic processes and their impact on the evolution of the composition and structure of Earth on a variety of timescales.

Ongoing/ Recent Projects:

I am working towards building a greater understanding of the availability of oxygen, or oxygen fugacity, in Earth’s mantle on a variety of spatial and temporal scales. I have shown that the oxygen fugacity of the upper mantle is heterogeneous from mid-ocean ridge to subduction settings. I am currently examining ocean-islands (e.g., Hawaii and Reunion Island) and large igneous provinces (e.g., Ontong Java Plateau) to assess if this heterogeneity extends to mantle plume-generated volcanism. I am also examining the subduction process and consequent effects on the composition of arc lavas in detail in the Izu-Bonin-Mariana volcanic arc.

Brounce, M.N., Stolper, E., and Eiler, J. (2017) Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plyme, and the role of volcanic gases in Earth’s oxygenation. Proceedings of the National Academy of Sciences v. 114, pp. 8997-9002.

Helz, R.T., Cottrell, E., Kelley, K.A., and Brounce, M.N. (2017) Redox history of the 1959 eruption of Kilauea volcano as defined by olivine-melt relationships and in situ XANES analyses. Journal of Volcanology and Geothermal Research v. 333, pp. 1-14.

Brounce, M.N., Stern, R.J., Kelley, K.A., Martinez, F., and Cottrell, E. (2016) The Fina Nagu Volcanic Complex: Unusual submarine arc volcanism in the rapidly deforming southern Mariana margin. Geochemistry, Geophysics, Geosystems v. 17, pp. 4078-4091.

Brounce, M.N., Kelley, K.A and Cottrell, E. (2015) Temporal evolution of mantle wedge oxygen fugacity during subduction initiation. Geology v. 43, pp. 775-778.

Brounce, M.N., Kelley, K.A. and Cottrell, E. (2014) The Fe3+/∑Fe variations in Mariana Arc basalts and primary fO2 of the mantle wedge. Journal of Petrology v. 55, pp. 2513-2536.

Le Voyer, M., Cottrell, E., Kellley, K.A., Brounce, M.N., Hauri, E.H. (2014) The effect of primary versus secondary processes on the volatile content of MORB glasses: an example from the equatorial Mid-Atlantic Ridge (5N – 3S) Journal of Geophysical Research: Solid Earth v. 120, pp. 125-144.

Brounce, M.N., Feineman, M., LaFemina P., and Gurenko A. (2012) Insights into crustal assimilation from boron in melt inclusions: 1783-1784 Lakagigar Eruption, Iceland. Geochimica et Cosmochimica Acta v. 94. pp. 164-180.

O’Hara, Y., Reagan, M.K., Fujikura, K., Watanabe, H., Martinez, F., Girard, G., Ribiero, J., Brounce M.N., Komori, N., and Kino, M. (2012) A serpentinite-hosted ecosystem in the Southern Mariana Forearc, Proceedings of the National Academy of Sciences v. 109, pp. 2177-2180.

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Riverside, CA 92521
Tel: (951) 827-1012

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Earth Sciences Information

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Tel: (951) 827-3182
Fax: (951) 827-4324