Mitchell, Ross N. and Kilian, Taylor M. and Raub, Timothy D. and Evans, David A. D. and Bleeker, Wouter and Maloof, Adam C. (2011) Sutton hotspot: Resolving Ediacaran-Cambrian Tectonics and true polar wander for Laurentia. American Journal of Science, 311 (8). pp. 651-663. ISSN 0002-9599 http://resolver.caltech.edu/CaltechAUTHORS:20120228-075924664
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Hotspot tracks represent plate motions relative to mantle sources, and paleomagnetic data from magmatic units along those tracks can quantify motions of those mantle anomalies relative to the Earth's magnetic field and rotational axis. The Ediacaran Period is notable for rapid and large paleomagnetic apparent polar wander (APW) for many continents. Whereas magmatic units attributed to the “Sutton” mantle plume suggest a practically stationary hotspot track, paleolatitudes of Laurentia for that interval vary dramatically; geologic and paleomagnetic data are at odds unless true polar wander (TPW) is invoked to explain a majority of APW. Here we test the plume-TPW hypothesis by generating the predicted Sutton hotspot track for a stationary plume under a moving plate along the Laurentian margin during the interval from 615 to 530 Ma. Our model is the first to provide a kinematic framework for the extensive large igneous province associated with opening the Iapetus Ocean.
|Additional Information:||© 2011 American Journal of Science. We are thankful for detailed comments from Jay Ague. The manuscript benefited from discussions with Mark Brandon, Richard Ernst, Zheng-Xiang Li, and Francis Macdonald and detailed reviews from Henry Halls and Rob Van der Voo. This work was funded by a NSF Graduate Research Fellowship awarded to Mitchell and by NSF-EAR 0739105 to Raub.|
|Subject Keywords:||Laurentia, Ediacaran, apparent polar wander (APW), true polar wander (TPW), plate tectonics, hotspot|
|Official Citation:||Ross N. Mitchell, Taylor M. Kilian, Timothy D. Raub, David A. D. Evans, Wouter Bleeker, and Adam C. Maloof Sutton hotspot: Resolving Ediacaran-Cambrian Tectonics and true polar wander for Laurentia Am J Sci October 2011 311:651-663; doi:10.2475/08.2011.01|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||28 Feb 2012 16:25|
|Last Modified:||28 Feb 2012 16:25|
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