Dr. Mary Reid


Professor, Chair


PhD, M.I.T.


Igneous petrology and geochemistry

Research interests

I am interested in the geochemical evolution of the lithosphere, especially as exemplified in the Quaternary.  My current research efforts are primarily focused on the timescales of magmatic processes as constrained by analytical and theoretical considerations, including the in situ analyses of Th isotopes in minerals that I developed for the high resolution ion microprobe.  Other targets of my research investigations include the mantle lithosphere and lower crust, ocean island and arc volcanism, exposure age dating, and accretionary prisms.  In support of my research, I have maintained a clean laboratory and thermal ionization mass spectrometry laboratory for high precision - including U-series nuclides - isotopic analyses, co-managed the UCLA Ion Microprobe Facility, and am now involved in research employing a laser-assisted multi-collector inductively coupled mass spectrometer.

Representative publications

(§ Student authors)

37.  Cooper, K.M. and Reid, M.R., 2008.  Uranium-Series Crystal Ages, in Review of Mineralogy and Geochemistry.

36. Reid, M.R., 2008, How long does it take to supersize and eruption? Elements 4, 23–28.

30. §Vazquez, J.A. and Reid, M.R., 2004, Probing the accumulation history of the voluminous Toba magma, Science 305, 991-994.

29. Reid, M.R., 2003, Timescales of magma transfer and storage in the crust, in The Crust (ed., R. L. Rudnick) Vol. 3, Treatise on Geochemistry (eds. H.D. Holland and K.K. Turekian), Elsevier, Oxford, 167-193.

24. §Cooper, K.M., Reid, M.R., Murrell, M.T. and Clague, D.A., 2001.  Crystal and magma residence at Kilauea volcano, Hawai’i: 230Th-226Ra dating of the 1955 east rift eruption, Earth Planet. Sci. Letts. 184, 703-718.

22. Reid, M.R. and Coath, C.D., 2000, In situ U-Pb ages of zircons from the Bishop Tuff: No evidence for long crystal residence times, Geology 28, 443-446.

21. §Bohrson, W.A. and Reid, M.R., 1998.  Genesis of evolved ocean island magmas by deep- and shallow-level basement recycling, Socorro Island, Mexico: Constraints from Th and other isotope signatures, J. Petrol. 39, 995-1008.

20. §Leland, J., Reid, M.R., Burbank, D., Finkel., R., and Caffee, M., 1998.  Incision and differential bedrock uplift along the Indus River near Nanga Parbat, Pakistan Himalaya, from 10Be and 26Al exposure age dating of bedrock straths, Earth Planet. Sci. Letts. 154, 93-107.

17. Reid, M.R., Coath, C.D., Harrison, T.M., and McKeegan, K.M., 1997.  Prolonged residence times for the youngest rhyolites associated with Long Valley caldera: Ion microprobe dating of young zircons, Earth Planet. Sci. Lett. 150, 27-38.

16. Reid, M.R. and Graham, D., 1996.  Resolving lithospheric and sub-lithospheric contributions to helium isotope variations in basalts from the southwestern US, Earth Planet. Sci. Lett. 144, 213-222.

10. Reid, M.R., 1995.  Processes of mantle enrichment and magmatic differentiation in the eastern Snake River Plain: Th isotope evidence, Earth Planet. Sci. Lett. 131, 239-254.


Office: 212 Geology Annex (Building 13) 
Phone: 928-523-7200
E-mail: Mary.Reid@nau.edu