Julie Bowles
Graduate Committee Chair; Associate Professor
Geosciences
Lapham Hall 358
Website: http://people.uwm.edu/bowlesj/
PhD, University of California, San Diego
BS, University of Washington
BA, University of Puget Sound
Research Interests
Dr. Bowles is interested in how the Earth’s magnetic field varies over time; and understanding how and how well magnetic minerals record these variations; and using these “rock records” of changing magnetic fields and magnetic properties to interpret volcanic processes. Recent projects include documenting variations in Earth’s field intensity in pyroclastic flows in the western U.S.; using recorded field variations to constrain eruptive processes on the Galapagos Spreading Center and the Juan de Fuca Ridge; and creating synthetic igneous rocks in the lab to better understand the magnetic recording process in rocks from Earth and Mars.
Teaching Areas
Geophysics
Selected Publications
Jung, Ji-In, and Bowles, Julie. “A Feasibility Study of Microbialites as Paleomagnetic Recorders” Frontiers in Earth Science (2021).
Bowles, Julie, Morris, Antony, Tivey, Maurice, and Lascu, Ioan. “Magnetic mineral populations in lower oceanic crustal gabbros (Atlantis Bank, SW Indian Ridge): Implications for marine magnetic anomalies” Geochemistry, Geophysics, Geosystems (2020).
Bowles, Julie, Lappe, Sophie-Charlotte, Jackson, Mike, Arenholz, Elke, and van der Laan, Gerrit. “Time-temperature dependent Curie temperature variations in titanomagnetite: evidence from XMCD and Mössbauer” Geochemistry Geophysics Geosystems 20. (2019): 2272–2289.
Clague, David, Caress, David, Dreyer, Brian, Lundsten, Lonny, Paduan, Jenny, Portner, Ryan, Spelz-Madero, Ronald, Bowles, Julie, Castillo, Paterno, Guardado-France, Rigoberto, Le Saout, Morgane, Martin, Julie, Santa Rosa-del Rıo, Miguel, and Zierenberg, Robert. “Geology of the Alarcon Rise, Southern Gulf of California” Geochemistry, Geophysics, Geosystems (2018).
Bowles, Julie, Gerzich, Devin, and Jackson, Mike. “Assessing New and Old Methods in Paleomagnetic Paleothermometry: A Test Case at Mt. St. Helens, USA” Geochemistry, Geophysics, Geosystems (2018).
Bowles, Julie, and Jackson, Mike J. “Effects of titanomagnetite reordering processes on thermal demagnetization and paleointensity experiments” Geochemistry Geophysics Geosystems 17. (2016): 4848– 4858.
Fedorchuk, Nicholas D., Dornbos, Stephen Q., Corsetti, Frank A., Isbell, John L., Petryshyn, Victoria A., Bowles, Julie, and Wilmeth, Dylan T. “Early non-marine life: Evaluating the biogenicity of Mesoproterozoic fluvial-lacustrine stromatolites” Precambrian Research 275. (2016): 105-118.
Bowles, Julie, Gee, Jeffrey, Jackson, Mike, and Avery, Margaret. “Geomagnetic paleointensity in historical pyroclastic density currents: Testing the effects of emplacement temperature and postemplacement alteration” Geochemistry Geophysics Geosystems 16. (2015): 3607–3625.
Brachfeld, Stefanie A., Cuomo, David, Tatsumi-Petrochilos, Lisa, Bowles, Julie, Shaw, Deepa, and Hammer, Julia. “Contributions of multidomain titanomagnetite to the intensity and stability of Mars crustal magnetic anomalies” Geophysical Research Letters 41.22 (2014): 7997-8005.
Jackson, Mike J., and Bowles, Julie. “Curie temperatures of titanomagnetite in ignimbrites: Effects of emplacement temperatures, cooling rates, exsolution, and cation ordering” Geochemistry Geophysics Geosystems 15.11 (2014): 4343–4368.
Bowles, Julie, Coleman, Alice, McClinton, J. T., Sinton, John, White, Scott, and Rubin, Kenneth. “Eruptive timing and 200-year episodicity at 92°W on the hotspot-influenced Galapagos Spreading Center derived from geomagnetic paleointensity” Geochemistry Geophysics Geosystems 15.6 (2014): 2211–2224.
Bowles, Julie, Tatsumi-Petrochilos, L., Hammer, J. E., and Brachfeld, S. A. “Multi-component cubic oxide exsolution in synthetic basalts: Temperature dependence and implications for magnetic properties” Journal of Geophysical Research 117.B3 (2012): 2156-2202.
Bowles, Julie, Gee, Jeffrey S., Burgess, Katherine, and Cooper, Reid F. “Timing of magnetite formation in basaltic glass; insights from synthetic analogs and relevance for geomagnetic paleointensity analyses” Geochemistry, Geophysics, Geosystems 12. Q02001 (2011).
Gee, Jeffrey S., Yu, Yongjae, and Bowles, Julie. “Paleointensity estimates from ignimbrites; an evaluation of the Bishop Tuff” Geochemistry, Geophysics, Geosystems 11.3 (2010): Q03010.
Bowles, Julie, Hammer, J. E., and Brachfeld, S. A. “Magnetic and petrologic characterization of synthetic Martian basalts and implications for the surface magnetization of Mars” Journal of Geophysical Research 114.E10 (2009): E10003.