Journal of the Geological Society

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Presentation transcript:

Journal of the Geological Society Measuring and interpreting CO2 fluxes at regional scale: the case of the Apennines, Italy by Francesco Frondini, Carlo Cardellini, Stefano Caliro, Giulio Beddini, Angelo Rosiello, and Giovanni Chiodini Journal of the Geological Society Volume 176(2):408-416 March 21, 2019 © 2018 The Author(s). Published by The Geological Society of London

Location of study area and springs from Apennine carbonate aquifers. Location of study area and springs from Apennine carbonate aquifers. Yellow dots refer to the Apennine springs reported in the supplementary material. Orange dots refer to springs from smaller carbonate aquifers of Umbria and Tuscany, and to Mt. Albani volcanic aquifer (from Chiodini et al. 2004b). Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London

Cext v. δ13Cext diagram. Cext v. δ13Cext diagram. Blue circles refer to groundwater with a Cext and δ13Cext compatible with dissolution of biological CO2 only, whereas red circles refer to groundwater with a high Cext and δ13Cext compatible with some input of deeply derived CO2. The theoretical field resulting from the addition of Cdeep with δ13Cdeep ranging from −5 to +1‰ to infiltrating water with Cinf = 2.31 ± 0.61 mmol l−1 and δ13Cinf = −21.6 ± 2.9‰ is indicated in grey. The dashed vertical line represents the Cext upper limit for the applicability of the no-sink assumption. Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London

Regional map of CO2 degassing. Regional map of CO2 degassing. The map reports the CO2 flux estimated through a geostatistical approach starting from the Cext values of each spring, the locations of which are indicated by open squares. Dashed lines highlight the location of Quaternary volcanic areas. The locations of CO2-rich gas emissions are shown as yellow circles (from www.magadb.net). Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London

Location of the central Italy Apennine aquifers showing locations where estimates of the advective heat flux have been calculated (Chiodini et al. 2013). Location of the central Italy Apennine aquifers showing locations where estimates of the advective heat flux have been calculated (Chiodini et al. 2013). Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London

The total geothermal heat (QH) plotted v The total geothermal heat (QH) plotted v. total CO2 of deep origin (QCO2,deep) that enters the 11 aquifers of the central Apennines (Fig. 4) and the Matese aquifer. The total geothermal heat (QH) plotted v. total CO2 of deep origin (QCO2,deep) that enters the 11 aquifers of the central Apennines (Fig. 4) and the Matese aquifer. All the aquifers are labelled except Umbria NE, G. Sasso S and Terminillo, that plot close to the origin. The QH and QCO2 associated with geothermal systems in central Italy and in the Taupo Volcanic Zone (Kerrick et al. 1995) are reported for comparison. Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London

Output of deeply derived CO2 in Italy from volcanoes with hydrothermal systems (yellow), volcanoes emitting SO2 (red), and from regional diffuse degassing structures in central Italy (blue). Output of deeply derived CO2 in Italy from volcanoes with hydrothermal systems (yellow), volcanoes emitting SO2 (red), and from regional diffuse degassing structures in central Italy (blue). Francesco Frondini et al. Journal of the Geological Society 2019;176:408-416 © 2018 The Author(s). Published by The Geological Society of London