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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. 



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Publications

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
Subtopic
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
cbtill@usgs.gov
650-329-5197
650-329-5203 - Fax
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