Carbon sources and water-rock interactions in the Allier River, France

Karine Rivé (1) , Sétareh Rad (2) , N. Assayag (3)

1 CEGEO
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 IPGP - Institut de Physique du Globe de Paris

The Allier river is one of major river in France as it is the main contributor of the Loire river, The Allier river present both natural environment upstream and a plain zone deeply impacted by mines and human activities. The original combination of d13C and d7Li data allow to decipher sources effects and in-situ phenomenon in the riverine inorganic carbon cycle such as mineral phases precipitation or equilibration with the atmosphere. These data show that the riverine system of the Allier is a mixing between DIC from organic decay produced in a natural environment (upstream) progressively enriched in DIC of anthropogenic origin (downstream) and deep carbon inputs implying thermo-water rock interactions.

Keywords: DIC; isotopes; carbon; lithium; water rock interactions; hydrothermalism; Allier

Domains: Sciences of the Universe [physics]; Earth Sciences; Geochemistry; Environmental Sciences; Global Changes

Karine Rivé, Sétareh Rad, N. Assayag. Carbon sources and water-rock interactions in the Allier River, France. Procedia Earth and Planetary Science, 2013, 7, pp.713-716. ⟨10.1016/j.proeps.2013.03.120⟩. ⟨hal-00755721⟩