Selected Publications of the Paleomagnetic Research Group:

• John A. Tarduno, Hotspots Unplugged, Scientific American, January, 2008 (pages 88-93).
• John A. Tarduno, On the motion of Hawaii and other mantle plumes, Chemical Geology, 241, 234-247, doi:10.1016/j.chemgeo.2007.01.021, 2007
• John A. Tarduno, Rory D. Cottrell, Michael K. Watkeys, and Dorothy Bauch,Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystals, Nature, 446, 657-660, doi:10.1038/nature05667, 2007.
• Pavel V. Doubrovine and John A. Tarduno, Alteration and self-reversal in oceanic basalts, J. Geophys. Res., 111, B12S30, doi:10.1029/2006JB004468, 2006.
• Pavel V. Doubrovine and John A. Tarduno, N-type magnetism at cryogenic temperatures in oceanic basalt, Physics of the Earth and Planetary Interiors, 157 (1-2), 46-54, 10.1016/j.pepi.2006.03.002, 2006.
• John A. Tarduno, Rory 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 of Geophysics, 44 (1), RG1002, 10.1029/2005RG000189, 2006.  
• Deborah Vandermark, John A. Tarduno and Donald B. Brinkman, Late Cretaceous Plesiosaur Teeth from Axel Heiberg Island, Nunavut, Canada, Arctic, 59 (1), 79-82, 2006.
• Donald B. Brinkman and John A. Tarduno, A Late Cretaceous (Turonian-Coniacian) high-latitude turtle assemblage from the Canadian Arctic, Can. J. Earth Sci., 42, 2073-2080, 2005.
• John A. Tarduno and Rory D. Cottrell, Dipole Strength and Variation of the Time-Averaged Reversing and Nonreversing Geodynamo Based on Thellier Analyses of Single Plagioclase Crystals, J. Geophys. Res., 110, B11101, doi:10.1029/2005JB003970, 2005.
• Alexei A. Smirnov and John A. Tarduno, Thermochemical remanent magnetization in Precambrian rocks: Are we sure the geomagnetic field was weak?, J. Geophys. Res., 110, B06103, doi:10.1029/2004JB003445, 2005. 
• Pavel V. Doubrovine and John A. Tarduno, On the compositional field of self-reversing titanomaghemite: Constraints from Deep Sea Drilling Project Site 307, J. Geophys. Res., 110, B11104, doi:10.1029/2005JB003865, 2005. 
• Alexei V. Smirnov and John A. Tarduno, Secular Variation of the Late Archean Earth Proterozoic Geodynamo, Geophysical Research Letters, 31 (16), L16607, 2004. 
  
• Pavel V. Doubrovine and John A. Tarduno, Self-reversed Magnetization Carried by Titanomaghemite in Oceanic Basalts, Earth and Planetary Science Letters, 222, 959-969, 2004. 
• John A. Tarduno and Alexei V. Smirnov, The Paradox of Low Field Values and the Long-term history of the Geodynamo, in Timescales of the Paleomagnetic Field (J.E.T. Channell, D.V. Kent, W. Lowrie, and J.G. Meert, Editors), AGU Geophysical Monograph Series 145, 2004.
• Matthew Friedman, John A. Tarduno and Donald B. Brinkman, Fossil Fishes from the High Canadian Arctic: Further Palaeobiological Evidence for Extreme Climatic Warmth During the Late Cretaceous (Turonian-Coniacian), Cretaceous Research, 24, 615-632, 2003.
• John A. Tarduno, Robert A. Duncan, David W. Scholl, Rory D. Cottrell, Bernhard Steinberger, Thorvaldur Thordarson, Bryan C. Kerr, Clive R. Neal, Fred A. Frey, Masayuki Torii, and Claire Carvallo, The Emperor Seamounts: Southward Motion of the Hawaiian Hotspot Plume in Earth's Mantle, Science, 1064-1069, 2003.
  
• Alexei V. Smirnov, John A. Tarduno, and Boris N. Pisakin, Paleointensity of the Early Geodynamo (2.45 Ga) as Recorded in Karelia: A Single Crystal Approach, Geology, 31,  415-418, 2003. 
• Rory D. Cottrell and John 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. 
• Alexei V. Smirnov and John A. Tarduno, Magnetic hysteresis monitoring of Cretaceous submarine basaltic glass during Thellier paleointensity experiments: evidence for alteration and attendant low field bias, Earth and Planetary Science Letters, 206, 571-585, 2003.
• John A. Tarduno, Rory D. Cottrell, and Alexei 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.
• John A. Tarduno, Robert A. Duncan, David W. Scholl, et al., Motion of the Hawaiian Hotspot: A Paleomagnetic Test, Initial Reports, Proceedings of the Ocean Drilling Program, 197, 2002.
• Alexei V. Smirnov and John A. Tarduno, Magnetite reveals ambient field strength at low temperatures,  EOS, Transactions of the American Geophysical Union, 83(29), 309-316, 2002.
• John A. Tarduno and Alexei V. Smirnov, Response to comment on "Stability of the Earth with respect to the spin axis for the last 130 Million Years" by P. Camps, M. Prévot, M. Daignières and P. Machetel, Earth and Planetary Science Letters, 198, 533-539, 2002.
• Alexei V. Smirnov and John A. Tarduno, Magnetic field control of the low-temperature magnetic properties of stoichiometric and cation-deficient magnetite,  Earth and Planetary Science Letters, 194, 359-368, 2002.
• John A. Tarduno, Rory 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.
• Alexei V. Smirnov and John A. Tarduno, Estimating superparamagnetism in marine sediments with the time dependency of coercivity of remanence, Journal of Geophysical Research, 106, 16,135-16,144, 2001.
• John A. Tarduno and Alexei V. Smirnov, Stability of the Earth with respect to the spin axis for the last 130 million years, Earth and Planetary Science Letters, 184, 549-553, 2001.
• Rory D. Cottrell and John 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.
• Alexei V. Smirnov and John A. Tarduno, Low-temperature magnetic properties of pelagic sediments (Ocean Drilling Program Site 805C): Tracers of maghemitization and magnetic mineral reduction, Journal of Geophysical Research, 105, 16,457-16,471, 2000.
• R. D. Cottrell and J. A. Tarduno, Late Cretaceous True Polar Wander: Not So Fast, Science, 288, 2283, 2000.
• Rory D. Cottrell and John A. Tarduno, Geomagnetic paleointensity derived from single plagioclase crystals, Earth and Planetary Science Letters, 169, 1-5, 1999.
• 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, v 282, 2241-2244, 1998.
• John A. Tarduno, Wenlai Tian, and Sarah L. Wilkison, Biogeochemical remanent magnetization in pelagic sediments of the western equitorial Pacific Ocean, Geophysical Research Letters, 25 (21), 3987-3990, 1998.
• John A. Tarduno and Rory 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, 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 S.L. Wilkison, Non-steady state magnetic mineral reduction, chemical lock-in, and delayed remanence acquisition in pelagic sediments, Earth and Planetary Science Letters, 144, 315-326, 1996.
• J.A. Tarduno and J. Gee, Large-scale motion between Pacific and Atlantic hotspots, Nature, 378, 477-480, 1995.
• J.A. Tarduno and W.W. Sager, Polar standstill of the mid-Cretaceous Pacific plate and its geodynamic implications, Science, 269, 956-959, 1995.
• J.A. Tarduno, Superparamagnetism and reduction diagnesis in pelagic sediments: Enhancement or depletion?, Geophysical Research Letters, 22, 1337-1340, 1995.
• J.A. Tarduno, and M. Myers, A primary magnetization fingerprint from the Cretaceous Laytonville Limestone: Further evidence for rapid plate velocities, Journal of Geophysical Research, 99, 21691-21703, 1994.
• J.A. Tarduno, Temporal trends of magnetic dissolution in the pelagic realm: Gauging paleoproductivity?, Earth and Planetary Science Letters, 123, 39-84, 1994.

Recent Presentations:

• Tarduno, J.A., Strength of the Archean geomagnetic field and effectiveness of magnetic shielding from the young active Sun, Jt. Assembly Meeting, Ft. Lauderdale, Florida, 2008. - invited
• Cottrell, R.D., Wendt, A.K., Tarduno, J.A, Watkeys, M.K. and Huffman, T., Paleointensity of Iron Age pottery shards from southern Africa, Jt. Assembly Meeting, Ft. Lauderdale, Florida, 2008 - invited
• Tarduno, J A; Cottrell, R D; Watkeys, M K; Hofmann, A., Constraints on Earth's oldest magnetic field, EGU General Assembly Meeting,  Vienna, Austria, 13 – 18 April, 2008 
• Tarduno, J A; Cottrell, R D; Watkeys, M K; Hofmann, A., Strength of the Archean geomagnetic field,  the paleomagnetosphere, and magnetic shielding against the young active Sun, EGU General Assembly Meeting,  Vienna, Austria, 13 – 18 April, 2008 
• Tarduno, J.A., Cottrell, R.D., Watkeys, M.K., and Hofmann, A. Constraints on the Earth's oldest magnetic field, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract DI31A-0247, 2007.
• Cottrell, R.D., Tarduno, J.A. and Doubrovine, P.V., Motion of Pacific mantle plumes, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract U34A-05, 2007.
• Tarduno, J.A. and Cottrell, R.D., A re-examination of directional and paleointensity results from the Kiaman Reversed Polarity Superchron at Kiama: A single crystal approach, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract GP52A-01, 2007.  invited
• Wendt, A.K., Tarduno, J.A., Cottrell, R.D., Watkeys, M.K., and Huffman, T.N.  Preliminary paleointensity investigation of Iron Age pottery shards from southern Africa, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract GP41A-03, 2007.
• Doubrovine, P.V. and Tarduno, J.A., Plate circuit reconstructions and the consistency between Pacific and non-Pacific paleomagnetic reference frames in Late Cretaceous to Paleogene times (80--50 Ma), Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract U13A-0870, 2007.
• Sail, A.B., Tarduno, J.T., Cottrell, R.D., Sutherland, R. and Campbell, H., The paleointensity of single silicate crystals from the Southern Volcanics of the Chatham Islands: What is the behavior of Earth's magnetic field leaving a superchron state?, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract GP42A-07, 2007.
• Smirnov, A.V. and Tarduno, J.A.,  Estimating Paleointensity Reliability Based on the Physical Mechanism of Natural Remanence, Eos Trans. AGU, 88(52), Fall Meet., Suppl., Abstract GP53A-0953, 2007.
• Tarduno, J.A., Doubrovine, P.V. and Cottrell, R.D. Hotspot motion, frames of reference, and predicted driving forces for North American Tectonostratigraphic terranes, GSA Corilleran Section Meeting, 2007.
• Tarduno, J.A., Long-term trends in paleointensity examined using Thellier analyses of single silicate crystals, Eos Trans. AGU, 88(23), Jt. Assem. Suppl., Abstract GP44A-04, 2007, - invited
• Cottrell, R.D.,  Tarduno, J.A. and Watkeys, M.K. (University of KwaZulu-Natel, Durban, South Africa), Examining the strength of Earth's early magnetic field, Geophysical Research Abstracts, Vol. 9, SRef-ID: 1607-7962/gra/EGU2007-A-02030, 2007.
• Tarduno, J.A.  and Cottrell, R.D, The Kiaman Reversed Polarity Superchron at Kiama, Geophysical Research Abstracts, Vol. 9, SRef-ID: 1607-7962/gra/EGU2007-A-02026, 2007.
• Tarduno, J.A., Cottrell, R.D., Morris, K, Watkeys, M.K., New approaches for the determination of absolute paleointensity: long and short-term trends, Eos Trans. AGU, 87 (52), Fall Meeting Suppl., Abstract GP13A-01, 2006. -  invited.
• Vandermark, D., Tarduno, J.A., Brinkman, D.  Late Cretaceous extreme polar warmth recorded by vertebrate fossils from the High Canadian Arctic, Eos Trans. AGU, 87 (52), Fall Meeting Suppl., Abstract  U24A-08, 2006.
• Mason, S.N., Cottrell, R.D., Tarduno, J.A., Lo, K. Paleomagnetic characterization of Mesozoic dikes from Mauritania, Africa, Eos Trans. AGU, 87 (52), Fall Meeting Suppl., Abstract  GP11A-00, 2006.
• Weaver, K.L., Tarduno, J.A., DePaolo, D.J., Neodymium and strontium isotopic composition of the Strand Fiord basalts: Cretaceous volcanism in the Canadian Arctic, Eos Trans. AGU, 87 (52), Fall Meeting Suppl., Abstract  U21B-0819, 2006.
• Cottrell, R.D.; Tarduno, J.A., Low temperature oxidation and long-term paleointensity (solicited), Geophysical Research Abstracts, Vol. 8, SRef-ID: 1607-7962/gra/EGU06-A-08682, 2006.
• Tarduno, J.A.; Cottrell, R.D., Hotspot motion and reference frames for plate motion (solicited), Geophysical Research Abstracts, Vol. 8, SRef-ID: 1607-7962/gra/EGU06-A-09541, 2006.
• Cottrell, R D, Tarduno, J A and Watkeys, M K, Rock magnetic and paleointensity data from plagioclase crystals of the Stormberg (Karoo) Lavas of Lesotho, Eos Trans. AGU, 86(52), Fall Meet. Suppl.,  GP13A-0033, 2005.
• Bauch, D G, Tarduno, J A, Cottrell, R D, Watkeys, M K,  Defining the Magnetic Field of the Early Earth Through Rock Magnetic and Paleomagnetic Analyses of Single Silicate Crystals, Eos Trans. AGU, 86(52), Fall Meet. Suppl.,  GP13A-0032, 2005.
• Smirnov, A V, Bauch, D G and Tarduno, J A, Temperature Dependence of Magnetic Susceptibility as a Potential indicator of fine-scale oxyexsolution in igneous rocks, Eos Trans. AGU, 86(52), Fall Meet. Suppl.,  GP13A-0040, 2005.
• Brown, H, Mason, S, Ebsary, W, Bauch, D G, Cottrell, R D, Tarduno J A and Sutherland, R, Characterization of Titanomagnetites and Titanomaghemites From Lavas of the Southern Volcanics, Chatham Islands, New Zealand, Eos Trans. AGU, 86(52), Fall Meet. Suppl.,  GP13A-0029, 2005.
• Tarduno, J. A.; Doubrovine, P. V.; Madoff, R., Hotspot motion, paleomagnetic tests of plate circuits, and coherency of the Pacific plate,Geophysical Research Abstracts, Vol. 7, SRef-ID: 1607-7962/gra/EGU05-A-02724, 2005.
• Tarduno, J. A.; Cottrell, R. D.; Bauch, D. G.; Watkeys, M. K., Geomagnetic Field Morphology and Inner Core Growth, Geophysical Research Abstracts, Vol. 7, SRef-ID: 1607-7962/gra/EGU05-A-02715, 2005.
• Tarduno, J. A.; Bauch, D. G.; Cottrell, R. D.; Watkeys, M. K., Mid-Archean Plate Velocities, Geophysical Research Abstracts, Vol. 7, SRef-ID: 1607-7962/gra/EGU05-A-02719, 2005.
• Smirnov, A V and Tarduno, J A, Memory of the magnetic field applied during cooling in stoichiometric magnetite: Grain-size dependence and inferences on the physical processes, Eos Trans. AGU, 86(18), Jt. Assem. Suppl.,  GP12A-03, 2005.
• Doubrovine, P V and Tarduno J A, On the Conditions for Self-reversal of Remanent Magnetization in Titanomaghemite: Constraints From DSDP Site 307 Basalts, Eos Trans. AGU, 86(18), Jt. Assem. Suppl.,  GP12A-01, 2005.
• Tarduno, J A, Cottrell, R D, Doubrovine, P V and Madoff, R, Hotspot motion, paleomagnetic tests of plate circuits,and coherency of the Pacific plate, Eos Trans. AGU, 86(18), Jt. Assem. Suppl.,  GP21A-03, 2005.
• Smirnov, A V,  Tarduno, J A,  Goree, W S,  Directional Behavior of Remanent Magnetization at Low Temperatures Measured With a New SQUID Magnetometer Probe, Eos Trans. AGU, 85(47), Fall Meet. Suppl.,  GP22A-04, 2004.
• Cottrell, R D, Smirnov A V and Tarduno, J A, Rapid True Polar Wander: A Quixotic Search?, Eos Trans. AGU, 85(47), Fall Meet. Suppl.,  U33A-0024, 2004.
• Tarduno, J.A., Hotspot motion, scales of mantle convection and the long-term history of the geodynamo, Eos Trans. AGU, 85(47), Fall Meet. Suppl.,  GP24A-01, 2004.
• Sinnett, D K, Tarduno J A, and Cottrell R D, A Late Cretaceous Reversal Recorded in Lavas of the High Canadian Arctic, Eos Trans. AGU, 85(47), Fall Meet. Suppl.,  GP11D-0873, 2004.
• Bauch, D G, Tarduno, J A, Cottrell, R D, Watkeys, M K, Toward Defining Archean Plate Motion, Eos Trans. AGU, 85(47), Fall Meet. Suppl.,  U33A-0031, 2004.
• Sinnett, D., Tarduno, J.A., and Cottrell, R.D.,  Preliminary Paleomagnetic Results from Late Cretaceous Volcanic Rocks of Northern Ellesmere Island, Canada, Eos, Transactions of the American Geophysical Union, 85(17) Jt. Assem. Suppl., GP31B-02, 2004.
• Bauch, D. G., Cottrell, R.D.,and Tarduno, J.A.  Preliminary Directional and Paleointensity Studies of South African Proterozoic/Archean Minerals using a CO2 Laser System, Eos, Transactions of the American Geophysical Union, 85(17) Jt. Assem. Suppl., GP43A-05, 2004.
• Tarduno, J.A. and Doubrovine, P. V.,  Self-reversed magnetizations in oceanic basalts, Eos, Transactions of the American Geophysical Union, 85(17) Jt. Assem. Suppl., GP54A-03, 2004.
• Tarduno, J.A. and Smirnov, A. V.,  Paleomagnetic and Paleointensity Results from ~2.45 Ga Matachewan Dikes (Ontario, Canada): Implications for the Early Geodynamo, Eos, Transactions of the American Geophysical Union, 85(17) Jt. Assem. Suppl., GP43A-04, 2004.