We report molybdenum isotope compositions and concentrations in water samples from a variety of river catchment profiles in order to investigate the influence of anthropogenic contamination, catchment geology, within-river precipitation, and seasonal river flow variations on riverine molybdenum. Our results show that the observed variations in δ98/95Mo from 0% to 1.9% are primarily controlled by catchment lithology, particularly by weathering of sulfates and sulfides. Erosion in catchments dominated by wet-based glaciers leads to very high dissolved molybdenum concentrations. In contrast, anthropogenic inputs affect neither the concentration nor the isotopic composition of dissolved molybdenum in the rivers studied here. Seasonal variations are also quite muted. The finding that catchment geology exerts the primary control on the delivery of molybdenum to seawater indicates that the flux and isotope composition of molybdenum to seawater has likely varied in the geologic past. © 2011 Elsevier B.V.

Neubert, N., Heri, A., Voegelin, A., Nägler, T., Schlunegger, F., Villa, I. (2011). The Molybdenum isotopic composition in River water: constraints from small catchments. EARTH AND PLANETARY SCIENCE LETTERS, 304(1-2), 180-190 [10.1016/j.epsl.2011.02.001].

The Molybdenum isotopic composition in River water: constraints from small catchments

VILLA, IGOR MARIA
2011

Abstract

We report molybdenum isotope compositions and concentrations in water samples from a variety of river catchment profiles in order to investigate the influence of anthropogenic contamination, catchment geology, within-river precipitation, and seasonal river flow variations on riverine molybdenum. Our results show that the observed variations in δ98/95Mo from 0% to 1.9% are primarily controlled by catchment lithology, particularly by weathering of sulfates and sulfides. Erosion in catchments dominated by wet-based glaciers leads to very high dissolved molybdenum concentrations. In contrast, anthropogenic inputs affect neither the concentration nor the isotopic composition of dissolved molybdenum in the rivers studied here. Seasonal variations are also quite muted. The finding that catchment geology exerts the primary control on the delivery of molybdenum to seawater indicates that the flux and isotope composition of molybdenum to seawater has likely varied in the geologic past. © 2011 Elsevier B.V.
Articolo in rivista - Articolo scientifico
Mo isotopes; river water; bedrock; weathering; fractionation; anthropogenic; sulfate; sulfide
English
2011
304
1-2
180
190
none
Neubert, N., Heri, A., Voegelin, A., Nägler, T., Schlunegger, F., Villa, I. (2011). The Molybdenum isotopic composition in River water: constraints from small catchments. EARTH AND PLANETARY SCIENCE LETTERS, 304(1-2), 180-190 [10.1016/j.epsl.2011.02.001].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/20083
Citazioni
  • Scopus 89
  • ???jsp.display-item.citation.isi??? 82
Social impact