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Morpho-tectono-magmatic evolution and reactivation of ultra-distal magma-poor rifted margins : the fossil Err-Platta Ocean-Continent-Transition (SE Switzerland) and comparison to present-day analogues

Abstract : The aim of this study is to investigate the morpho-structural and magmatic evolution of magma-poor distal rifted margins, as well as their reactivation. This study is focused on the fossil distal margins of the Alpine Tethys. The study of the reactivation of these domains, (Err and Platta, Switzerland) shows that alpine thrusts principally reworked former rift structures. The Err nappe can be restored as a hyper-extended domain characterized by a system of detachment faults with a complex architecture evolving in-sequence and leads to the continental crust separation and the exhumation of mantle. The Platta nappe corresponds to a subcontinental exhumed mantle domain associated to an increase of syn-tectonic magmatic additions oceanwards. The distal domain is interpreted as the relic of a dome-shaped structure capped by a detachment fault and crosscut by latter normal faults facilitating the emplacement of basalts and fluid circulations. The approach developed in this thesis enabled a better understanding of one distal and ultra-distal magma-poor rifted margin, as well as to discuss processes related to the formation and reactivation of plate boundaries.
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https://tel.archives-ouvertes.fr/tel-01781308
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Submitted on : Monday, April 30, 2018 - 10:09:09 AM
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Marie-Eva Epin. Morpho-tectono-magmatic evolution and reactivation of ultra-distal magma-poor rifted margins : the fossil Err-Platta Ocean-Continent-Transition (SE Switzerland) and comparison to present-day analogues. Earth Sciences. Université de Strasbourg, 2017. English. ⟨NNT : 2017STRAH013⟩. ⟨tel-01781308⟩

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