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Geochemistry of cold CO2-rich springs of the Scuol-Tarasp region, Lower Engadine, Swiss Alps

Published inJournal of Hydrology, vol. 104, no. 1-4, p. 77-92
Publication date1988
Abstract

A study of CO₂-rich (up to 3000 mg l⁻¹) mineral (up to 460 meq l⁻¹ total dissolved ions) and cold (2°–9°C) springs of the Lower Engadine region in the Swiss Alps, indicate the existence of three distinct geochemical groups: Ca-HCO₃ water, Na-HCO₃, Cl water and Na, Mg-HCO₃, SO₄ water. In each water group local mixing is observed between a mineral endmember of a pre-1953 age and a fresh, post-1953, endmember. All the spring waters appear to be of shallow origin and derived from local precipitation. The chemical composition is reached by local water-rock interactions, induced by CO₂, which ascends as a gaseous phase that emerges in mofettes and gets locally dissolved in shallow groundwater. The CO₂ is of crustal origin, as indicated by accompanying ³He/⁴He values of 0.1 of the atmospheric value, and δ ¹³C of around - 4‰ (PDB) (decomposition of marine carbonates and/or carbonates associated with rocks belonging to an ophiolitic suite).

Funding
  • Swiss National Science Foundation - 2.373-0.84
  • Swiss National Science Foundation - 2.064-0.86
Citation (ISO format)
WEXSTEEN, Pierre Valentin Jacque, JAFFE, Felice, MAZOR, Emanuel. Geochemistry of cold CO<sub>2</sub>-rich springs of the Scuol-Tarasp region, Lower Engadine, Swiss Alps. In: Journal of Hydrology, 1988, vol. 104, n° 1-4, p. 77–92. doi: 10.1016/0022-1694(88)90158-8
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ISSN of the journal0022-1694
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