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Changements microstructuraux et diversité microbienne associés à l'altération des silicates : influence sur les cinétiques de dissolution du laboratoire au terrain

Abstract : Chemical weathering of silicate minerals is central to numerous environmental and societal challenges. This study addresses the long-standing question of the inconsistency between field and laboratory estimates of dissolution kinetics, by revisiting current approaches of mineral reactivity. It is demonstrated that evolution of feldspar reaction rates are inaccurately describedby current kinetics rate laws, due to textural and structural changes occurring at the fluid-mineral interface over the course of the dissolution process. A novel method is developed to enable probing biogeochemical weathering rates in the field. Bacterial and fungal metagenomic data reveal that subtle reciprocal relationships are established between microorganisms and mineral substrates within the mineralosphere. This thesis emphasizes the impact of passivation phenomena on dissolution rates, under field-relevant reacting conditions and the incapacity of microorganisms to overcome the passivation barrier.
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https://tel.archives-ouvertes.fr/tel-01999338
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Submitted on : Wednesday, January 30, 2019 - 9:42:29 AM
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Bastien Wild. Changements microstructuraux et diversité microbienne associés à l'altération des silicates : influence sur les cinétiques de dissolution du laboratoire au terrain. Science des sols. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAH004⟩. ⟨tel-01999338⟩

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