USGS - science for a changing world

USGS Professional Pages

Blank space
Search USGS Professionals Featured Profiles Blank space Frequently Asked Questions  |  About The USGS Professional Pages
bio image of Christy  Till

Christy Till

Research Geologist

Contact Info

Short Biography

I am currently a Mendenhall Postdoctoral Fellow at the US Geological Survey in Menlo Park, CA with a joint appointment as a visting scholar at Stanford. Previously, I completed my Ph.D. at MIT in Geology, and a B.S. and M.S. at U.C. Santa Barbara in Geological Sciences.  I currently also serve as an early career representative on the Council of the American Geophysical Union.


Research Interests:

My research focuses on better understanding processes of magma formation in the Earth's Interior.  My current research at the USGS involves examining the temporal-thermal-compositional history of magma that formed during the most recent eruptive episode of voluminous volcanism at Yellowstone using a combination of radioisotopic dating, diffusion dating (“geospeedometry”) and chemical analyses of single crystals preserved in effusive and pyroclastic volcanic rocks.  This research includes use of both the SHRIMP-RG in the Stanford USGS MicroAnalysis Center (SUMAC) and the NanoSIMS in the Nanocharacterization Lab at Stanford.  Previously, I have utilized a variety of geochemical and high pressure experimental techiniques to investigate magma formation in the Earth's mantle at convergent plate margins; including an examination of the water-saturated peridotite solidus from 3-6 GPa, development of a new thermometer-barometer for variably enriched and/or depleted plagioclase and spinel lherzolite, and an investigation of the depths and temperatures of Quaternary basalt magma genesis below Oregon's High Lava Plains. 

Read Full Professional Summary


Till, C.B., Grove, T.L., Carlson, R.W., Donnelly-Nolan, J.M., Fouch, M.J.,Wagner, L.S., Hart, W.K., in press, Depths and Temperatures of <10.5 Mantle Melting and the Lithosphere-Asthenosphere Boundary below S. Oregon and N. California, Geochemistry, Geophysics, Geosystems.

Till, C.B., Grove, T.L., and Krawczynski, M.J., 2012, A melting model for variably depleted and enriched lherzolite in the plagioclase and spinel stability fields, Journal of Geophysical Research (Solid Earth),v.117, B06206, doi:10.1029/2011JB009044. [Link]

Grove, T.L., Till, C.B., Krawczynski, M.J., The Role of H2O in Subduction Zone Magmatism, 2012, Annual Reviews in Earth and Planetary Sciences v. 40, p. 413-439. doi:10.1146/annurev-earth-042711-105310. [Link]

Till, C.B., Grove, T.L., Withers, T., 2012, The Beginnings of Hydrous Mantle Wedge Melting, Contributions to Mineralogy and Petrology, doi: 10.1007/s00410-011-0692-6. [Link]

Long, M.D., Till, C.B., Druken, K.A., Carlson, R.W., Wagner, L.S., Fouch, M.J., James, D.E., Grove, T.L., Schmerr, N., 2012, Mantle dynamics beneath the Pacific Northwest and the generation of voluminous back-arc volcanism, Geochemistry Geophysics Geosystems, Vol., 13, Q0AN01, 22 p., doi: 10.1029/2012GC004189. [Link]

Till, C.B., Grove, T.L., Withers, T., 2012, Reply to ‘Comment on “The beginnings of hydrous mantle wedge melting” by Till et al.’ by Stalder, Contributions to Mineralogy and Petrology, doi: 10.1007/s00410-012-0797-6. [Link]

Till, C.B., Grove, T.L., Withers, T., 2012, Reply to ‘Comment on “The beginnings of hydrous mantle wedge melting” by Till et al.’ by Green, Rosenthal and Kovacs, Contributions to Mineralogy and Petrology, doi: 10.1007/s00410-012-0803-z. [Link]

Till, C.B., Elkins-Tanton, L.T. and Fisher, K.M., 2010, Low Extent Melts at the Lithosphere-Asthenosphere Boundary, Geochemistry Geophysics Geosystems, Vol. 11, No. 10, doi:10.1029/2010GC003234. [Link]

Till, C.B., Gans, P.B., and Spera, F.J., 2009, Perils of petrotectonic modeling: A view from southern Sonora Mexico; J. Volcanology & Geothermal Research, Vol. 186, p.160-168. [Link]

Grove, T.L., Till, C.B., Lev, E., Chatterjee, N. and Medard, E., 2009, Kinematic variables and water transport control the formation and location of arc volcanoes; Nature, Vol. 459, p.694-697. [Link]

Mariner, R.H., Minor, S.A., King, A.P., Boles, J.R., Kellog,, K.S., Evans, W.C., Landis, G.A., Hunt, A.G. and Till, C.B., 2008, A landslide in Tertiary marine shale with superheated fumaroles, Coast Ranges, California, Geology, Vol. 36, No. 12, p.959-962 [Link]

Hirschmann, M.M., Ghiorso, M.S., Davis, F.A., Gordon, S.M., Mukherjee, S., Grove, T.L., Krawczyniski, M., Medard, E., and Till, C.B., 2008, Library of Experimental Phase Relations (LEPR): A database and web portal for experimental magamatic phase equilibria data; G-cubed, Vol. 9, Article No. Q03011. [Link]

Spera, F.J., Bohrson, W.A., Till, C.B., and Ghiorso, M.S., 2007, Partitioning of trace elements among coexisting crystals, melt and supercritical fluid during isobaric crystallization and melting; American Mineralogist, Vol. 92, p.1881-1898. [Link]


My Science Topics

Science Topic
Natural Hazardsvolcanic activity
Natural Hazardsvolcanic eruption prediction
Natural Hazardsvolcanoes

Igneous Petrology; Experimental Petrology; Magma Genesis; Volcano Hazards

Contact Information

Christy Till
345 Middlefield Road
Menlo Park, CA 94025-3561
650-329-5203 - Fax
Back to top

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information:Ask USGS
Page Last Modified: January 24 2013 17:21:51.
Version: 2.6