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Antretter, M., Steinberger, B., Heider, F. and Soffel, H. (2002). Paleolatitudes of the Kerguelen hotspot: new paleomagnetic results and dynamic modeling. Earth and Planetary Science Letters 203(2): 635-650. |
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The Kerguelen Plateau, a Large Igneous Province in the southern Indian Ocean, was formed as a product of the Kerguelen hotspot in several eruptive phases during the last 120 Myr. We obtained new paleolatitudes for the central and northern Kerguelen Plateau from paleomagnetic investigations on basalts, which were drilled during ODP Leg 183 to the Kerguelen Plateau-Broken Ridge. The paleolatitudes coincide with paleolatitudes from previous investigations at the Kerguelen Plateau and Ninetyeast Ridge (the track of the Kerguelen hotspot) and indicate a difference between paleolatitudes and present position at 49 S of the Kerguelen hotspot. We show that true polar wander, the global motion between the mantle and the rotation axis, cannot explain this difference in latitudes. We present numerical model results of plume conduit motion in a large-scale mantle flow and the resulting surface hotspot motion. A large number of models all predict southward motion between 3 and 10 for the Kerguelen hotspot during the last 100 Myr, which is consistent with our paleomagnetic results. (C) 2002 Elsevier Science B.V. All rights reserved. |
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Keywords
geomagnetism, paleomagnetism, leg 183, paleolatitude, true polar wander, hot spots, mantle plumes, kerguelen plateau, large-scale flow, plate motions, mantle convection, plumes, atlantic, pacific, earth, oceans, axis |
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Publisher
Elsevier Science
P.O. Box 211
1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
nlinfo-f@elsevier.com |
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