Les structures dimpact sur Europe : implications sur la rhéologie et la thermique de la croûte de glace. Impact features on Europa : rheological and thermal states of the icy crust.Report as inadecuate




Les structures dimpact sur Europe : implications sur la rhéologie et la thermique de la croûte de glace. Impact features on Europa : rheological and thermal states of the icy crust. - Download this document for free, or read online. Document in PDF available to download.

1 LPGN - Laboratoire de Planétologie et Géodynamique de Nantes

Abstract : The depth of the brittle-ductile transition has been estimated under each graben rounding two ancient impact basins on Europa, Callanish and Tyre. Surface thermal gradients have been computed and are respectively equal to 4.3 +- 0.4 and 2.4 +- 0.25 K-km. These results differ strongly from previous works obtained on other Europa-s features. This can be explained by the variation of both the icy grain size and the chemical composition of the crust, but also by the variation of the local deformation rate.

Mots-clés : Europe cratère d-impact gradient thermique rhéologie Europa impact craters thermal gradients rheology





Author: Loïc Mével Olivier Grasset - Eric Mercier -

Source: https://hal.archives-ouvertes.fr/



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