Use of Isotopes for Groundwater Characterization and Monitoring

CO2 Inflow and Elements Desorption Prior to a Seismic Sequence, Amatrice‐Norcia 2016, Italy

“…This desorption process is supported by the following considerations: (i) clays and iron oxides‐(hydroxides) logK values (Ranjbar & Jalali, ) and isotope fractionation effects ( 10 B enrichment on the surface of minerals; Lemarchand et al, ; Schwarcz et al, ) are similar; (ii) similar boron concentration and δ 11 B values were detected in cold groundwater, which interacted with clays and/or iron hydroxides formed in volcanic deposits (B = 233 ± 58 μg/L; δ 11 B = +0.9 ± 4.5‰; Battistel, ). Finally, the hypothesis of boron desorption is in agreement with previous work concerning different boron sources (Barth, ; Négrel et al, ; Figure ).…”

“…In this study, we assessed the possible relationship between deep CO 2 inflow and the anomalies on trace elements such as arsenic (As) and vanadium (V) detected in groundwater before and during the 2016 B versus boron concentrations in the S1 water collected during the seismic sequence (data in Table S1). Dashed-contoured circles depict different and common boron sources (Barth, 1997;Négrel et al, 2009); solid and dotted lines represent the binary mixing between them. Crosses highlight the mean and standard deviation values detected in hot and cold water from volcanoclastic deposits (Battistel, 2014).…”

“…(a) δ 11 B versus boron concentrations in the S1 water collected during the seismic sequence (data in Table S1). Dashed‐contoured circles depict different and common boron sources (Barth, ; Négrel et al, ); solid and dotted lines represent the binary mixing between them. Crosses highlight the mean and standard deviation values detected in hot and cold water from volcanoclastic deposits (Battistel, ).…”

HydroQuakes, central Apennines, Italy: Towards a hydrogeochemical monitoring network for seismic precursors and the hydro-seismo-sensitivity of boron

“…Boschetti et al (2019) showed that the B and δ 11 B opposite trends were due to the desorption of B from mineral surfaces such as clays (e.g. Barth, 1997;Négrel et al, 2009) at deep crustal levels during pre-seismic dilation phases, when CO 2 -rich fluids ascend and interact with the surrounding rocks. The opposite B and δ 11 B concentration trends were particularly evident in the Grassano spring (rather than in the Decontra spring), where a marked pre-seismic increase of B concentration was observed (Fig.…”