Mark K Reagan CV

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Mark Reagan © 2008


Curriculum Vitae

Higher Education

University of California, Santa Cruz, California, 1982-1987, Ph.D. Geology, September 1987, Dissertation title: Turrialba Volcano, Costa Rica: Magmatism at the southeast terminus of the Central American arc.

University of Arizona, Tucson, Arizona, 1979-1982, M.S. Geology, May 1982, Thesis title: Geology and geochemistry of early arc volcanic rocks from Guam.

University of California, Santa Barbara, California, 1975-1978, B.A. geology with High Honors, March 1978

Professional and Academic Positions

Professor of Geochemistry and Igneous Petrology, 2007 - present, Department of Earth and Environmental Sciences, University of Iowa, Iowa City.

Co-chief scientist, Internation Ocean Discovery Program, Expedition 352, July 30-September 29, 2014

Department Executive Officer (Chair) 2009-2014, Department of Earth and Environmental Sciences, University of Iowa, Iowa City.

Associate Professor, 1995 - 2007, Department of Geoscience, University of Iowa. Guest Investigator, Fall 2000,

Woods Hole Oceanographic Institute, Woods Hole, Massachusetts Assistant Professor, 1987 to 1995, Department of Geology, University of Iowa.

Physical Science Technician, Summers - 1983 and 1984, U.S. Geological Survey, Vancouver, Washington.

Geologist, Summer 1982, GeothermEx Inc., Richmond, California; 1981, Freeport Exploration Co., Tucson, Arizona; 1979, Noranda Exploration, Denver, Colorado; 1978, WGM Inc., Anchorage, Alaska

Recent Publications

Reagan, M.K., Heaton, D.E., Schmitz, M.D. Pearce, J.A., Shervais, and Koppers, A.A.P., Forearc ages reveal extensive short-lived and rapid seafloor spreading following subduction initiation. Earth and Planetary Science Letters, submitted.

Shervais, J.W., Reagan, M. Haugen, E. Almeev, R., Pearce, J., Prytulak, J., Ryan, J., Whattam, S., Godard, M., Chapman, T. Li, H., Kurz, W. Nelson, W., Heaton, D., Kirchenbaur, M., Shimizu, K., Sakuyama, T., Li, Y., Vetter, S., 2018, Magmatic Response to Subduction Initiation, Part I: Forearc basalts of the Izu-Bonin Arc from IODP Expedition 352. Geochemistry Geophysics Geosystems, submitted.

Pearce, J.A., and Reagan, M.K., 2018, Identification, classification and interpretation of boninites from the Recent-Eoarchean geologic record using Si-Mg-Ti-Cr systematics, Geosphere, submitted.

Handley, H. K., Reagan, M. K., Gertisser, R., Preece, K., Berlo, K., Barclay, J., Herd, R., 2018, Timescales of magma ascent and degassing and the role of crustal assimilation at Merapi volcano (2006-2010), Indonesia: constraints from uranium-series and radiogenic isotopic compositions. Geochimica et Cosmochimica Acta, 222, 34-52.

Reagan, M.K., Heywood, L., Goff, K., Michibayashi, K., Foster, C. T, Jr., Jicha, B., Lapen, T., McClelland, W.C., Ohara, Y., Righter, M., Scott, S., and Sims, K.W.W., 2018, Geodynamic implications of crustal lithologies from the southeast Mariana forearc. Geosphere, v.14, 22 pp., doi: 10.1130/GES01536.1.

Girard, G., Reagan, M.K., Sims, K.W.W., Thornber, C.R., Waters, C.L., and Phillips, E.H., 2017, 238U-230Th-226Ra-210Pb-210Po disequilibria constraints on magma generation, ascent, and degassing during the ongoing eruption of Kilauea. Journal of Petrology, v. 58, p. 11991226, doi: 10.1093/petrology/egx051.

Reagan, M., Turner, S., Handley, H., Turner, M., Beier, C., Caufield, J., Peate, D., 2017, 210Pb-226Ra disequilibria in young gas-laden magmas. Scientific Reports. DOI: 10.1038/srep45186.

Reagan, M. K., Pearce, J. A., Petronotis, K., et al., 2017, Subduction initiation and ophiolite crust: new insights from IODP drilling. International Geology Review. DOI: 10.1080/00206814.2016.1276482.

Ryan, J. G., Li, Y., Reagan, M. K., Li, H., Heaton, D., Godard, M., Kirchenbaur, M., Whattam, S., Pearce, J. A., Chapman, T., Nelson, W., Prytulak, J., Shervais, J., Shimizu, K., Petronotis, K., 2017, Application of a handheld X-ray fluorescence spectrometer for real-time, high-density quantitative analysis of drilled igneous rocks and sediments during IODP Expedition 352. Chemical Geology. v. 451, p.5566.

Elkins, L. J., Scott, S. R., Rivers, E., Sims, K. W. W., Reagan, M. K., Devey, C., Hamelin, C., Pedersen, R., 2016, Detecting mantle eclogite at mid-ocean ridges and hotspots: U-series constraints on Jan Mayen Island and the Kolbeinsey Ridge. Chemical Geology, 444, 128-140.

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

Reubi, O., Sims, K.W.W., Varley, N., Reagan, M., Eikenberg, J., 2015, Timescales of degassing and conduit dynamics inferred from 210Pb226Ra disequilibria in Volcan de Colima 19982010 andesitic magmas. In: Caricchi, L. & Blundy, J. D. (eds) Chemical, Physical and Temporal Evolution of Magmatic Systems. Geological Society, London, Special Publications, v. 422.18 pp. doi: 10.1144/SP422.5.

Ishizuka, O., Tani, K., Reagan, M.K., 2014, Izu-Bonin-Mariana fore-arc crust as a modern ophiolite analogue. Elements, v. 10, p. 115-120.

Johnson, J.A., Hickey-Vargas, R., Fryer, P., Salters, V., Reagan, M.K., 2014, Geochemical and isotopic study of a plutonic suite and related early volcanic sequences in the southern Mariana forearc. Geochemistry, Geophysics, Geosystems, v. 15, p. 589-604

Turner, S., Rushmer, T., Reagan, M., Moyen, J-F., 2014, Heading down early on? Start of subduction on Earth. Geology, v. 42, p. 139-142.

Elkins, L.J., Sims, K.W.W., Prytulak, J., Blichert-Toft, J., Elliott, T., Blusztajn, J., Fretzdorff, S., Reagan, M K., Haase, K., Humphris, S., Schilling, J.-G., 2014, Melt generation beneath Arctic Ridges: Implications from measurements of U decay series disequilibria in the Mohns, Knipovich, and Gakkel Ridges. Geochimica et Cosmochimica Acta. v. 127, p. 140-170.

Reagan, M.K., McClelland, W.C. Girard, G., Goff, K.R., Peate, D.W., Ohara, Y., & Stern, R.J., 2013, The geology of the southern Mariana fore-arc crust: implications for the scale of Eocene volcanism in the western Pacific. Earth and Planetary Science Letters, v. 380, p. 41-51.

Ribeiro, J.M., Stern, R.J., Martinez, F., Ishizuka, O., Merle, S.G., Kelley, K., Anthony, E.Y., Ren, M., Ohara, Y., Reagan, M.K., Girard, G., Bloomer, S., 2013, Geodynamic evolution of a forearc rift in the southernmost Mariana Arc. Island Arc, v. 22, p. 453–476.

Turner, M.B. Reagan, M.K., Turner, S.P., Sparks, R.S.J., Handley, H.K., Girard, G., Suh C.E., 2013, Volatile fluxing and eruption explosivity – insights from U-series disequilibria at Mount Cameroon, West Africa. Journal of Volcanology and Geothermal Research, v. 262, p. 38-46.

Waters, C.L., Sims, K.W.W., Klein, E.M., White, S.M., Reagan, M.K., Girard, G., 2013, Sill to surface: Linking young off-axis volcanism with subsurface melt at the overlapping spreading center at 9o03’N East Pacific Rise. Earth and Planetary Science Letters, v. 369-370, p. 59-70.

Sims, K.W.W., Pichat, S., Reagan, M., Kyle, P., Dulaiova, H., Dunbar, N., Prytulak, J., Sawyer, G., Layne, G., Blichert-Toft, J., Gauthier, P., Charrette, M., Elliott, T., 2013, On the timescales of magma genesis, melt evolution, crystal growth rates and magma degassing in the Erebus volcano magmatic system using the 238U-, 235U- and 232Th-decay series. Journal of Petrology, v. 54, p. 235-271.

Stern, R.J., Reagan, M.K., Ishizuka, O., Ohara, Y., and Whattam, S., 2012, To Understand Subduction Initiation, Study Forearc Crust; To Understand Forearc Crust, Study Ophiolites. Lithosphere v. 4 p. 469-483.

Turner, S., Reagan, M., Vigier, N, Bourdon, B., 2012, Origin of 210Pb-226Ra disequilibria in basalts - new insights from the 1978 Asal Rift eruption. Geochemistry Geophysics Geosystems doi:10.1029/2012GC004173, v. 13, 8pp. 3/28/12.

Garrison, J.M., Reagan, M.K., Sims, K.W.W., 2012, Dacite formation at Ilopango Caldera, El Salvador: U-series disequilibrium and implications for petrogenetic processes and magma storage time. doi:10.1029/2012GC004107, Geochemistry Geophysics Geosystems, v. 13, 20 pp.

Ohara,Y., Reagan, M.K., Fujikura, K., Watanabe., H., Michibayashi, K., Ishii, T., Stern, R.J., Pujana, J.I., Martinez, F., Girard, G., Ribeiro, J., Brounce, M., Naoaki K., and Kino, M., 2012, A serpentinite-hosted ecosystem in the Southern Mariana Forearc. Proceedings of the National Academy of Sciences. PNAS, v. 109 p. 2831–2835.

Ishizuka, O., Tani, K., Reagan, M.K., Kanayama, K., Umino, S., Harigane, Y., Sakamoto, I., Miyajima, Y., Yuasa, M., Dunkley, D.J., 2011, The timescales of subduction initiation and subsequent evolution of an oceanic island arc. Earth and Planetary Science Letters, v. 306 p. 229-240.

Turner, S., Sandiford, M., Reagan, M., Hawkesworth, C., Hildreth, W., 2010, The origins of large volume, compositionally-zoned volcanic eruptions – new constraints from U-series isotopes and numerical thermal modeling for the 1912 Katmai-Novarupta eruption. Journal of Geophysical Research doi:10.1029/2009JB007195, 22 pp.

Reagan, M.K., Ishizuka, O., Stern, R.J., Kelley, K.A., Ohara, Y., Blichert-Toft, J., Bloomer, S.H., Cash, J., Fryer, P., Hanan, B., Hickey-Vargas, R., Ishii, T., Kimura, J-I., Peate, D.W., Rowe, M.C., and Woods, M., 2010, Fore-arc basalts and subduction initiation in the Izu-Bonin-Mariana system. Geochemistry Geophysics Geosystems. v. 11, doi: 10.1029/2009GC002871, 17 pp.

Chakrabarti, R., Sims, K.W.W., Basu, A.R., Reagan, M. and Durieux, J. 2009, Timescales of Magmatic Processes and Eruption Ages of the Nyiragongo volcanics from 238U-230Th-226Ra-210Pb disequilibria. Earth and Planetary Science Letters. V. 288, p. 149-157.

Kayzar, T.M., Cooper, K.M., Reagan, M.K., and Kent, A.J.R., 2009, Gas transport model for the magmatic system at Mount Pinatubo, Philippines: Insights from (210Pb)/(226Ra). Journal of Volcanology and Geothermal Research. v. 181, p. 124-140.

Reagan, M.K., Cooper, K.M., Pallister, J.S., Thornber, C.R., and Wortel, M., 2008, Timing of degassing and plagioclase growth in lavas erupted from Mount St. Helens, 2004–2005, from 210Po–210Pb–226Ra disequilibria, in Sherrod, D.R., Scott, W.E., and Stauffer, P.H., A volcano rekindled: the first year of renewed eruption at Mount St. Helens, 2004-2006: U.S. Geological Survey Professional Paper 1750, p. 847-856.

Reagan, M.K., Turner, S., Legg, M., Sims, K.W.W., and Hards, V.L., 2008, 238U- and 232Th-decay series constraints on the timescales of crystal fractionation to produce the phonolite erupted in 2004 near Tristan da Cunha, South Atlantic Ocean. Geochimica et Cosmochimica Acta. v. 72, p. 4367-4378

Sims, K.W.W, Hart, S.R., Reagan, M.K., Blusztajn, J., Staudigel, H, Sohn, R.A., Layne, G .D., Ball, L.A., Andrews, J., 2008, 238U-230Th-226Ra-210Pb-210Po, 232Th-228Ra and 235U-231Pa constraints on the ages and petrogenesis of Vailulu’u and Malumalu Lavas, Samoa. G3, v.9 Q04003, doi:10.1029/2007GC001651, 30 pp.

Reagan, M.K., Hanan, B.B., Heizler, M.T., Hartman, B.S., Hickey-Vargas, R., 2008, Petrogenesis of volcanic rocks from Saipan and Rota, Mariana Islands and implications for the evolution of nascent island arcs. Journal of Petrology. v. 49, p. 441-464.*