Reconstructing modern and past weathering regimes using boron isotopes in river sediments

Abstract : This thesis has the following objectives: 1) To better understand how boron isotopes in modern fluvial sediments record the weathering regime at the catchment scale. 2) To better understand how the weathering “signal” carried by river sediments is transferred from source areas to the depositional environment. 3) To determine if boron isotopes in sediment deposits (paleochannels) can be used to reconstruct paleo-weathering and paleo-environmental conditions and reveal how continental weathering at large (production and sediment transport) responds to climatic variability over the last glacial-interglacial cycle (last 100 ka). These objectives were addressed by studying fluvial material from the Gandak (Himalayas) and Murrumbidgee (NSW, Australia) Rivers and fluvial sediment deposits from the Riverine Plain (Murrumbidgee catchment, Australia). Knowledge of the parameters that control boron isotope fractionation of river sediment during formation and transport was first gained in the modern systems and then applied to ancient paleochannel deposits.
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Christian Ercolani. Reconstructing modern and past weathering regimes using boron isotopes in river sediments. Geochemistry. Université de Strasbourg; University of Wollongong (Wollongong, Australie), 2018. English. ⟨NNT : 2018STRAH008⟩. ⟨tel-02176267⟩

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