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Fast Paleogene Motion of the Pacific Hotspots From Revised Global Plate Circuit Constraints

Raymond, Carol A. and Stock, Joann M. and Cande, Steven C. (2000) Fast Paleogene Motion of the Pacific Hotspots From Revised Global Plate Circuit Constraints. In: History and Dynamics of Global Plate Motions. Geophysical monograph. No.121. American Geophysical Union , Washington, DC, pp. 359-375. ISBN 9780875909790.

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Major improvements in Late Cretaceous-early Tertiary Pacific-Antarctica plate reconstructions, and new East-West Antarctica rotations, allow a more definitive test of the relative motion between hotspots using global plate circuit reconstructions with quantitative uncertainties. The hotspot reconstructions, using an updated Pacific-hotspot kinematic model, display significant misfits of observed and reconstructed hotspot tracks in the Pacific and Indian Oceans. The misfits imply motions of 5-80 mm/yr throughout the Cenozoic between the African-Indian hotspot group and the Hawaiian hotspot. Previously recognized misfits between reconstructed Pacific plate paleomagnetic poles and those of other plates might be accounted for within the age uncertainty of the paleomagnetic poles, and non-dipole field contributions. We conclude that the derived motion of the Hawaiian hotspot relative to the Indo-Atlantic hotspots between 61 Ma and present is a robust result. Thus, the Pacific hotspot reference frame cannot be considered as fixed relative to the deep mantle. The bend in the Hawaiian-Emperor Seamount chain at 43 Ma resulted from a speedup in the absolute motion of the Pacific plate in a westward direction during a period of southward migration of the hotspot. The relationship between the hotspot motion and plate motion at Hawaii suggests two possible scenarios: an entrainment of the volcanic sources in the asthenosphere beneath the rapidly moving plate while the hotspot source drifted in a plate-driven counterflow deeper within the mantle, or drift of the hotspot source which was independent of the plate motion, but responded to common forces, producing synchronous changes in hotspot and plate motion during the early Tertiary.

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Stock, Joann M.0000-0003-4816-7865
Additional Information:© 2000 American Geophysical Union. This work benefited from discussions with many people, especially Richard Gordon, Bernhard Steinberger, Todd Ratcliff, Dietmar Mueller, Chuck DeMets and Gary Acton. Reviews by B. Steinberger and an anonymous reviewer improved the manuscript. GMT software was used to produce the figures (Wessel and Smith, 1991). This research was supported by NSF-OPP-93-17318. Part of the work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract to the National Aeronautics and Space Administration. California Institute of Technology, Division of Geological and Planetary Sciences, Contribution number 8688.
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Caltech Division of Geological and Planetary Sciences8688
Series Name:Geophysical monograph
Issue or Number:121
Record Number:CaltechAUTHORS:20140416-153704888
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Official Citation:Raymond, C. A., Stock, J. M. and Cande, S. C. Fast Paleogene Motion of the Pacific Hotspots from Revised Global Plate Circuit Constraints, in The History and Dynamics of Global Plate Motions (eds M. A. Richards, R. G. Gordon and R. D. Van Der Hilst), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM121p0359
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44992
Deposited By: Tony Diaz
Deposited On:21 Apr 2014 22:50
Last Modified:10 Nov 2021 16:59

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