Auxiliary Material Submission for Paper 2009tc002541 Intermediate to felsic middle crust in the accreted Talkeetna arc, the Alaska Peninsula, and Kodiak Island, south central Alaska: An analogue for low-velocity middle crust in modern arcs Matthew Rioux Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA James Mattinson and Bradley Hacker Department of Earth Science, University of California, Santa Barbara, California, USA Peter Kelemen Lamont Doherty Earth Observatory, Columbia University, Palisades, New York, USA Jurek Blusztajn and Karen Hanghoj Department of Geology and Geophysics, Woods Hole Oceanographic Institute, Woods Hole, Massachusetts, USA George Gehrels Department of Geosciences, University of Arizona, Tucson, Arizona, USA Rioux, M., J. Mattinson, B. Hacker, P. Kelemen, J. Blusztajn, K. Hanghoj, and G. Gehrels (2010), Intermediate to felsic middle crust in the accreted Talkeetna arc, the Alaska Peninsula, and Kodiak Island, south central Alaska: An analogue for low-velocity middle crust in modern arcs, Tectonics, 29, TC3001, doi:10.1029/2009TC002541. Introduction Auxiliary materials for this article include multi-grain chemical abrasion TIMS U-Pb zircon data collected at the University of California, Santa Barbara (Data Set S1; 2009tc002541-ds01.txt), LA-ICP-MS U-Pb zircon data collected at the University of Arizona (Data Set S2; 2009tc002541-ds02.txt), and a table of modal mineralogies used in the calculation of sample seismic velocities (Table S1; 2009tc002541-ds03.txt), and a list of references cited in the auxiliary tables. The auxiliary data sets and table are tab delimited text files created in Microsoft Excel. 1. 2009tc002541-ds01.txt, 2009tc002541-ds01.xls Data Set S1. Multi-grain chemical abrasion-TIMS U-Pb zircon data 2. 2009tc002541-ds02.txt, 2009tc002541-ds02.xls Data Set S2. Laser ablation-ICP-MS U-Pb zircon data 3. 2009tc002541-ts01.txt, 2009tc002541-ts01.xls Table S1. Modal mineralogies used to calculate seismic velocities Auxiliary Material References Black, L. P., Kamo, S. L., Allen, C. M., Davis, D. W., Aleinikoff, J. N., Valley, J. W., Mundil, R., Campbell, I. H., Korsch, R. J., Williams, I. S., and Foudoulis, C., 2004, Improved 206Pb/238U microprobe geochronology by monitoring of a trace-element- related matrix effect; SHRIMP, ID-TIMS, ELA-ICP-MS and oxygen isotope documentation for a series of zircon standards: Chemical Geology, v. 205, p. 115-140. Greene, A. R., DeBari, S. M., Kelemen, P. B., and Clift, P. D., 2006, A detailed geochemical study of island arc crust: The Talkeetna arc section, south-central Alaska: Journal of Petrology, DOI:10.1093/petrology/eg1002. Hacker, B. R., Wallis, S. R., Ratschbacher, L., Grove, M., and Gehrels, G., 2006, High- temperature geochronology constraints on the tectonic history and architecture of the ultrahigh-pressure Dabie Sulu orogen: Tectonics, 25, TC5006, doi:10.1029/2005TC001937. Hacker, B.R., Mehl, L., Kelemen, P. B., Rioux, M., Behn, M. D., and Luffi, P., 2008 Reconstruction of the Talkeetna intra-oceanic arc of Alaska through thermobarometry, Journal of Geophysical Research, 113, B03204, doi:10.1029/2007JB005208. Johnsen, M., 2007, Geochemical composition of the western Talkeetna island arc crustal section, lower Cook Inlet region, Alaska: Implications for crustal growth along continental margins: Western Washington University, M. Sc. Thesis, 99 pp. Ludwig, K. R., 2003, User's manual for Isoplot 3.00: A geochronological toolkit for Microsoft Excel: Berkeley, Berkeley Geochronology Center Special Publication No. 4, 70 pp. Rioux, M., Hacker, B., Mattinson, J., Kelemen, P., Blusztajn, J., and Gehrels, G., 2007, Magmatic development of an intra-oceanic arc: High precision U-Pb zircon and whole rock isotopic analyses from the accreted Talkeetna arc, south-central Alaska: GSA Bulletin, 119, 1168-1184, doi: 10.1130B25964.1. Stacey, J. S. and Kramers, J. D., 1975, Approximation of terrestrial Lead isotope evolution by a two-stage model: Earth and Planetary Science Letters, v. 26, p. 207-221.