Isotopic fractionation mechanism: a key to interpretating isotopic compositon of calcite at aquifer outlet as hydrosystem dynamic
Résumé
The isotopic composition of the calcite that precipitates at the level of springs outlets records the hydrodynamic variations of the hydrosystems. However, to be able to decipher this recording, it is necessary to understand the kinetic isotopic fractionations. A mathematical approach has been developed to reproduce the chemical and isotopic partition during calcite precipitation and CO2 degassing. The approach correctly reproduces the evolutions observed in situ. The following step remains the integration of environmental parameters to field constraints on the model (flow, water level…).
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