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Analyse des structures de la surface d'Europe (satellite de glace de Jupiter): conséquences dynamiques, rhéologiques et thermiques

Abstract : Europa is a rocky body overlaid by a thick external H2O layer ranging from 80 to 140 km which surface is totally frozen. Heat dissipation due to jovian tides may preserve a liquid ocean above the icy crust and would allow internal dynamics. Morphostructural analysis of Galileo's images gives insights about the structure, the thermal state and the strain rates of the crust. The depth of the rheological transitions highly depends on the location and on the type of feature, and then on the implied “geological” process. The slow relaxation of 2 impact basins allows the assessment of thermal fluxes lower than 30 mW.m-2 implying a conductive crust ranging from 9 to 32 km in thickness over a cold ocean. Nevertheless, other features give insights about flows of material along a regional slope and vertical deformations at large-scale (~100 km) which are rare on the Europa's surface. Furthermore, we have pointed out a large disappearance of crust around an extensive strike-slip band, which opening may be related to Europa's non-synchronous rotation. Finally, these results will be used to constraint the physical models developed elsewhere.
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https://tel.archives-ouvertes.fr/tel-00006231
Contributor : Loïc Mével <>
Submitted on : Wednesday, June 9, 2004 - 2:35:50 PM
Last modification on : Tuesday, October 6, 2020 - 11:40:05 AM
Long-term archiving on: : Wednesday, November 23, 2016 - 4:52:41 PM

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  • HAL Id : tel-00006231, version 1

Citation

Loïc Mével. Analyse des structures de la surface d'Europe (satellite de glace de Jupiter): conséquences dynamiques, rhéologiques et thermiques. Géologie appliquée. Université de Nantes, 2003. Français. ⟨tel-00006231⟩

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