Source, transport et enfouissement du carbone organique lors de l'érosion continentale : l'exemple du système himalayen

Abstract : In the Ganga-Brahmaputra system, TOC linearly increases with the relative proportion of philosilicates and fine grain minerals. The proportion of fossil Corg in the suspended and bed sediments is respectively ~ 20 % and > 50 % of the TOC. During the Gangetic floodplain transit, more than 50 % of recent Corg derived from the Himalaya is oxidised and is replaced by Corg derived from the floodplain. The Corg loadings of river and recent Bengal Fan sediments are comparable. Biomarker abundance and ð13C show that Corg is dominated by terrestrial inputs. Consequently, the terrestrial Corg burial efficiency must be around 100 %. In the Himalayan basin, we estimate the burial fluxes or recent and fossil Corg to be respectively 3.1 + - 0.3 × 1011 mol/yr and 0.9 + - 0.4 × 1011 mol/yr. Corg burial therefore account for ~ 80 % of atmospheric CO2 consumption generated by Himalayan erosion. Efficient burial of Corg is likely a characteristic of high physical erosion typical of active orogenic systems
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Valier Galy. Source, transport et enfouissement du carbone organique lors de l'érosion continentale : l'exemple du système himalayen. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL037N⟩. ⟨tel-01752844⟩

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