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dc.contributor.authorKoivisto, Emilia A.
Andrews, David L.
Gordon, Richard G.
dc.date.accessioned 2014-09-09T16:04:20Z
dc.date.available 2014-09-09T16:04:20Z
dc.date.issued 2014
dc.identifier.citation Koivisto, Emilia A., Andrews, David L. and Gordon, Richard G.. "Tests of fixity of the Indo-Atlantic hot spots relative to Pacific hot spots." Journal of Geophysical Research: Solid Earth, 119, no. 1 (2014) John Wiley & Sons, Inc.: 661-675. http://dx.doi.org/10.1002/2013JB010413.
dc.identifier.urihttps://hdl.handle.net/1911/77151
dc.description.abstract Rates of inter-hot spot motion have been debated for decades. Herein we present updated predictions for the tracks of the Tristan da Cunha, Réunion, and Iceland hot spots assuming them to be fixed relative to Pacific hot spots. Uncertainties in Pacific hot spot rotations, which include uncertainties in the current locations of hot spots of 100–200 km, are combined with uncertainties in relative plate motions accumulated through the plate circuit to obtain the final uncertainty in the predicted positions (including uncertainties of 150–200 km in the current locations of the Indo-Atlantic hot spots). Improvements to reconstruction methods, to relative plate reconstructions, to age dates along the tracks, and to the geomagnetic reversal timescale lead to significant changes from prior results. When compared with the observed tracks, the predicted tracks indicate nominal rates of motion of only 2–6 mm a−1 of these Indo-Atlantic hot spots relative to Pacific hot spots over the past 48 Ma. Within the uncertainties, the rates range from no motion to rates as high as 8–13 mm a−1. For reconstructions prior to 48 Ma B.P., however, the apparent rates of inter-hot spot motion are much larger, 46–55 ± 20 mm a−1, if the motion occurred entirely between 68 Ma B.P. and 48 Ma B.P. Either hot spots moved rapidly before 48 Ma B.P., and slowed drastically at ≈ 48 Ma B.P., or global plate circuits through Antarctica become less reliable as one goes increasingly further into the past. Most paleomagnetic data favor the latter explanation.
dc.language.iso eng
dc.publisher John Wiley & Sons, Inc.
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Tests of fixity of the Indo-Atlantic hot spots relative to Pacific hot spots
dc.type Journal article
dc.contributor.funder National Science Foundation
dc.citation.journalTitle Journal of Geophysical Research: Solid Earth
dc.subject.keywordhot spots
Pacific Ocean
plate motions
dc.citation.volumeNumber 119
dc.citation.issueNumber 1
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1002/2013JB010413
dc.identifier.grantID OCE-0527375 (National Science Foundation)
dc.identifier.grantID OCE-1061222 (National Science Foundation)
dc.type.publication publisher version
dc.citation.firstpage 661
dc.citation.lastpage 675


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