Publication Date:
2017-04-04
Description:
Hydrochemical (major and some minor constituents), stable isotope (dDH2O
and d18OH2O; d13CTDIC total dissolved inorganic carbon) and dissolved gas composition have been
determined on 33 thermal discharges located throughout Sicily (Italy) and its adjacent islands. On the basis
of major ion contents, four main water types have been distinguished: (1) a Na-Cl type; (2) a Ca-Mg〉Na-
SO4-Cl type; (3) a Ca-Mg-HCO3 type and (4) a Na-HCO3 type water. Most waters are meteoric in origin or
resulting from mixing between meteoric water and heavy-isotope end members. In some samples, d18O
values reflect the effects of equilibrium processes between thermal waters and rocks (positive 18O-shift) or
thermal waters and CO2 (negative 18O-shift). Dissolved gas composition indicates the occurrence of gas/
water interaction processes in thermal aquifers. N2/O2 ratios higher than air-saturated water (ASW),
suggest the presence of geochemical processes responsible for dissolved oxygen consumption. High CO2
contents (more than 3000 cc/litre STP) dissolved in the thermal waters indicate the presence of an external
source of carbon dioxide-rich gas. TDIC content and d13CTDIC show very large ranges from 4.6 to
145.3 mmol/Kg and from )10.0& and 2.8&, respectively. Calculated values indicate the significant
contribution from a deep source of carbon dioxide inorganic in origin. Interaction with Mediterranean
magmatic CO2 characterized by heavier carbon isotope ratios (d13CCO2 value from )3 to 0& vs V-PDB
(CAPASSO et al., 1997, GIAMMANCO et al., 1998; INGUAGGIATO et al., 2000) with respect to MORB value and/
or input of CO2-derived from thermal decomposition of marine carbonates have been inferred.
Description:
Published
Description:
781-807
Description:
JCR Journal
Description:
reserved
Keywords:
Thermal waters,
;
chemical and isotope composition,
;
dissolved gases
;
d13C
;
Sicily.
;
03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
;
03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
;
03. Hydrosphere::03.04. Chemical and biological::03.04.07. Radioactivity and isotopes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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