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Rivers from the upper Rio Madeira basin (Bolivia) have been studied with uranium-series isotopes in order to constrain the timescales of weathering and sediment transfer from the Andes through the Amazon tropical plain. Uranium (U), thorium (Th) and radium (Ra) isotopes ( 238 U– 234 U– 230 Th– 226 Ra and 232 Th) have been analyzed in the suspended load (>0...
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