Deep carbon degassing in the Matese massif chain (Southern Italy) inferred by geochemical and isotopic data
- PDF / 3,440,049 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 12 Downloads / 194 Views
SELECTED CASE STUDIES ON THE ENVIRONMENT OF THE MEDITERRANEAN AND SURROUNDING REGIONS
Deep carbon degassing in the Matese massif chain (Southern Italy) inferred by geochemical and isotopic data Francesco Rufino 1 & Emilio Cuoco 1,2 & Gianluigi Busico 3 & Stefano Caliro 2 & Erica L. Maletic 4 & Rosario Avino 2 & Thomas H. Darrah 4,5 & Dario Tedesco 1,2 Received: 13 April 2020 / Accepted: 4 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The Italian Apennines are among the most important sources of freshwater for several Italian regions. With evidences of deep CO2-rich fluids intruding into aquifers in the nearby central-southern Apennines, a thorough investigation into the geochemistry of groundwater became critical to ensure the water quality in the area. Here, we show the main hydrogeochemical processes occurring in the Matese Massif (MM) aquifer through the investigation of 98 water samples collected from springs and water wells. All waters were classified as HCO3 type with Ca dominance (from 50% up to 97%) and variable amount of Mg (from 1% up to 49%). A multivariate statistical approach through the application of the factor analysis (FA) highlighted three main hydrogeochemical processes: (i) water-carbonate rock interactions mostly enhanced in peripheral areas of the MM by CO2 deep degassing; (ii) addition of NaCl-rich components linked to recharging process and to water mixing processes of the groundwater with a thermal component relatively rich in Cl, Na, and CO2; (iii) anthropogenic activities influencing groundwater composition at the foothills of MM. Furthermore, the first detailed TDIC, pCO2, and δ13C-TDIC distribution maps of the MM area have been created, which track chemical and isotopic anomalies in several peripheral areas (Pratella, Ailano, and Telese) throughout the region. These maps systematically highlight that the greater the amount of dissolved carbon occurs the heavier the C isotope enrichment, especially in the peripheral areas. Conversely, spring waters emerging at higher altitudes within MM are only slightly mineralized and associated with δ13C-TDIC values mainly characterized by recharging processes with the addition of biogenic carbon during the infiltration process through the soil. Keywords Mineral springs . Factor analysis . Total dissolved inorganic carbon . CO2 degassing . δ13C-TDIC
Responsible editor: Philippe Garrigues Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-11107-1) contains supplementary material, which is available to authorized users. * Francesco Rufino [email protected] 1
2
Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy Istituto Nazionale di Geofisica e Vulcanologia, sezione di Napoli Osservatorio Vesuviano, Via Diocleziano 328, 80124 Naples, Italy
3
Department of Geology, Laboratory of Engineering Geology & Hydrogeology, Aristotle Universi
Data Loading...
