Interactions entre tectonique, érosion, altération des roches silicatées et climat à l'échelle des temps géologiques : rôle des chaînes de montagnes

Abstract : This thesis explores how orogenies may affect the Earth climate through the quantification of the interactions between climate dynamics, continental erosion, silicate rock weathering rate and geological carbon cycle. The first chapter describes the mechanisms linking the continental topography and its impacts on the atmospheric and oceanic circulations, with emphasis on the thermohaline circulation. The second chapter compares the effects on continental weatherability of climate dynamics and erosional changes related to the presence of mountains. The third chapter describes a dynamic model of regolith designed for global scale simulations, and describes its transient behavior, as well as its response to a CO2 degassing. Finally, the last chapter presents a numerical model of the continental isotopic cycle of lithium, so that its reliability as a proxy of the past weathering can be tested. The model explores the case study of the Amazon lithium cycle.
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Pierre Maffre. Interactions entre tectonique, érosion, altération des roches silicatées et climat à l'échelle des temps géologiques : rôle des chaînes de montagnes. Géophysique [physics.geo-ph]. Université Paul Sabatier - Toulouse III, 2018. Français. ⟨NNT : 2018TOU30287⟩. ⟨tel-02479159⟩

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