Paleointensity, Cretaceous paleomagnetism, plate motion and tectonics, hotspot motion, rock magnetism and environmental magnetism, experimental design for magnetic measurements.
Courses Offered (subject to change)
Evolution of the Earth
Solid Earth Geophysics
Paleomagnetism and Global Plate Tectonics
Seminar in Paleomagnetism
J.A. Tarduno, R.D. Cottrell and S.L. Wilkison, Magnetostratigraphy of the Late Cretaceous to Eocene Sverdrup Basin: Implications for heterochroneity, deformation and rotations in the Canadian Arctic Archipelago, Journal of Geophysical Research,102, 723-746, 1997.
J. A. Tarduno and R. D. Cottrell, Paleomagnetic evidence for motion of the Hawaiian hotspot during formation of the Emperor seamounts, Earth and Planetary Science Letters,153, 171-180, 1997.
J. A. Tarduno, D. B. Brinkman, P. R. Renne, R. D. Cottrell, H. Scher, P. Castillo, Evidence for Extreme Climatic Warmth from Late Cretaceous Arctic Vertebrates, Science,282, 2241-2244, 1998.
R. D. Cottrell and J. A. Tarduno, Geomagnetic paleointensity derived from single plagioclase crystals, Earth and Planetary Science Letters,169, 1-5, 1999.
R. D. Cottrell and J. A. Tarduno, Late Cretaceous True Polar Wander: Not So Fast, Science,288, 2283, 2000.
R. D. Cottrell and J. A. Tarduno, In search of high fidelity geomagnetic paleointensities: A comparison of single plagioclase crystal and whole rock Thellier-Thellier analyses, Journal of Geophysical Research,105, 23,579-23,594, 2000.
J. A. Tarduno, R. D. Cottrell, and Alexei V. Smirnov, High Geomagnetic Field Intensity During the mid-Cretaceous from Thellier Analyses of Single Plagioclase Crystals, Science, 291, 1779-1783, 2001.
J. A. Tarduno, R. D. Cottrell, and A. V. Smirnov, The Cretaceous superchron geodynamo: Observations near the tangent cylinder, Proceedings of the National Academy of Sciences of the United States of America, 99, 14020-14025, 2002.
R. D. Cottrell and J. A. Tarduno, A Late Cretaceous pole for the Pacific plate: implications for apparent and true polar wander and the drift of hotspots, Tectonophysics,362, 321-333, 2003.
J. A. Tarduno, R. A. Duncan, D. W. Scholl, R. D. Cottrell, B. Steinberger, T. Thordarson, B. C. Kerr, C. R. Neal, F. A. Frey, M. Torii, and C. Carvallo, The Emperor Seamounts: Southward Motion of the Hawaiian Hotspot Plume in Earth's Mantle, Science,301, 1064-1069, 2003.
J. A. Tarduno and R. D. Cottrell, Dipole strength and variation of the time-averaged reversing and nonreversing geodynamo based on Thellier analyses of single plagioclase crystals, Journal of Geophysical Research,110, B11101, doi:10.1029/2005JB003970, 2005.
J. A. Tarduno, R. D. Cottrell, and Alexei V. Smirnov, The paleomagnetism of single silicate crystals: Recording geomagnetic field strength during mixed polarity intervals, superchrons, and inner core growth, Reviews in Geophysics,44(1), RG1002, 10.1029/2005RG000189, 2006.
J. A. Tarduno, R. D. Cottrell, M. K. Watkeys, and D. Bauch, Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystals, Nature,446, 657-660, doi:10.1038/nature05667, 2007.
R. D. Cottrell, J. A. Tarduno, and J. Roberts, The Kiaman Reversed Polarity Superchron at Kiama: Toward a field strength estimate based on single silicate crystals, Physics of the Earth and Planetary Interiors, 169, 49-58, doi:10.1016/j.pepi.2008.07.041, 2008.
Y. Usui, J.A. Tarduno, M. Watkeys, A. Hofmann and R.D. Cottrell, Evidence for a 3.45 billion-year-old magnetic remanence from conglomerates of South Africa, Geochem. Geophys. Geosystems (G-cubed), 10, Q09Z07, 2009.
J.A. Tarduno, R.D. Cottrell, M.K. Watkeys, A. Hofmann, P.V. Doubrovine, E.E. Mamajek, D. Liu, D.G. Sibeck, L.P. Neukirch and Y. Usui, Geodynamo, Solar wind, and magnetopause 3.4 to 3.45 billion years ago, Science, 327, 1238-1240, 2010.
J.A. Tarduno, R.D. Cottrell, F. Nimmo, J. Hopkins, J. Voronov, A. Erickson, E.G. Blackman, E.R.D. Scott, R. McKinley, Evidence for a Dynamo in the Main Group Pallasite Parent Body, Science, 338, 939-942, 2012.
J.A. Tarduno, R.D. Cottrell, Signals from the ancient geodynamo: A paleomagnetic field test on the Jack Hills metaconglomerate, Earth and Planetary Science Letters, 367, 123-132, 2013.
Tarduno, J.A., Watkeys, M.K., Huffman, T.N., Cottrell, R.D., Blackman, E.G., Wendt, A., Scribner, C.A., Wagner, C.L., Antiquity of the South Atlantic Anomaly and evidence for top-down control on the geodynamo, Nature Communications, 6, Article no. 7865, 2015.
Tarduno, J.A., Cottrell, R.D., Davis, W.J., Nimmo, F., Bono, R.K., A Hadean to Paleoarchean geodynao recorded by single zircon crystals, Science, 349, 521-524, 2015.
Cottrell, R.D., Tarduno, J.A., Bono, R.K., Dare, M.S., Mitra, G., The inverse microconglomerate test: Further evidence for the preservation of Hadean magnetizations in metasediments of the Jack Hills, Western Australia, Geophysical Research Letters, 43, 4215-4220, 2016.