Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Abstract

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Geochemistry, stable isotopes and statistic tools to estimate threshold and source of nitrate in groundwater (Sardinia, Italy)

“…Climate is Mediterranean with warm dry summers and mild rainy winters. The mean annual temperature is 15.9 °C and mean annual precipitation is 537 mm, the latter mostly concentrated between October and March (Frau et al, 2020). Land uses consist of woodland, Mediterranean maquis, orchards, olive groves, arable fields and natural grazing; greenhouses are mostly located in the South (RAS, 2013b).…”

“…6b), likely indicating oxygen isotopic exchange between the groundwater and the gas phase CO2. These samples were located in correspondence of faults bordering the Campidano graben (Cocco et al, 2012), where thermal waters occur (Angelone et al, 2005;Frau et al, 2020).…”