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Interaction des différentes échelles de convection dans le manteau terrestre

Abstract : Two analysis have been used to characterize the interaction of different convective scales in the Earth's mantle. First, the experimental study of viscous fluid convective motions in a tank heated by one side and cooled from above makes it possible to describe small-scale convection morphology at the bottom of the oceanic lithosphere, where instabilities from the upper cold boundary layer are sheared by plate tectonics flow. We show that these instabilities can be organized in stationary rolls or in plumes. Second, a precise analysis of geophysical data leads to the characterization of the Hawaiian hot spot signature resulting from the interaction of a plume with the oceanic lithosphere. Time evolutions of the swell and volcanic edifices volumes show an important increase since 30 Ma, and point out the magma production rate as the best relevant parameter to describe the hot spot temporal evolution.
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Contributor : Valérie Vidal <>
Submitted on : Wednesday, April 27, 2005 - 6:11:19 PM
Last modification on : Friday, December 11, 2020 - 3:28:04 PM
Long-term archiving on: : Friday, September 14, 2012 - 12:50:18 PM


  • HAL Id : tel-00009127, version 1


Valérie Vidal. Interaction des différentes échelles de convection dans le manteau terrestre. Dynamique des Fluides [physics.flu-dyn]. Institut de physique du globe de paris - IPGP, 2004. Français. ⟨tel-00009127⟩



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