Dissolved potassium in the shallow groundwaters circulating in the volcanic rocks of central-southern Italy |
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| Institution: | 1. Géosciences Environnement Toulouse (GET), Observatoire Midi-Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue Edouard Belin, F-31400 Toulouse, France;2. Laboratoire de Géodynamique, Université Chouaïb Doukkali, El Jadida, Morocco;3. Geodynamics and Mineral Resources, Royal Museum for Central Africa, B-3080 Tervuren, Belgium;1. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via Giorgio La Pira, 4, I-50121 Firenze, Italy;2. Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via Giorgio La Pira, 4, I-50121 Firenze, Italy;3. Dipartimento di Neuroscienze, Università degli Studi di Parma, Via Volturno, 39, I-43125 Parma, Italy;1. Dpt. of Mineralogy and Petrology, Faculty of Sciences and Technology, University of the Basque Country UPV/EHU, Sarriena s/n, 48940 Leioa, Spain;2. Dpt. of Geodynamics, Faculty of Pharmacy, University of the Basque Country UPV/EHU, 01006 Vitoria, Spain;3. Dpt. of Geodynamics, Faculty of Sciences and Technology, University of the Basque Country UPV/EHU, Sarriena s/n, 48940 Leioa, Spain |
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| Abstract: | The water–rock interaction processes occurring in the low-temperature, shallow volcanic aquifers of central-southern Italy were simulated by means of the EQ3/6 Software Package in reaction progress mode. In the investigation both the Roman Magmatic Province and Monte Amiata, which belongs to the Tuscan Magmatic Province, were included. The average K2O content of the volcanic rocks from the two areas is similar but the main K-bearing phases are leucite, in the Roman Magmatic Province, and sanidine, at Monte Amiata.Computed concentrations of major dissolved components and SiO2 are consistent with analytical data, suggesting that the results of the EQ3/6 runs are reliable simulations of the natural water–rock interaction processes. Hence, EQ3/6 results can be used to investigate the transfer of K from rocks to water.It turns out that the attainment of saturation with sanidine, during early stages of rock dissolution, limits K concentration in the Monte Amiata groundwaters to around an average of 2.9 ± 1.3 mg L?1 (1SD). In the silica undersaturated Roman Magmatic Province, saturation with leucite is not attained during the evolution of groundwaters and, consequently, K concentration reaches comparatively high levels, with an average of 24.6 ± 27.1 mg L?1 (1SD). Most of these unusually high K concentrations are due to natural weathering of silicates without any anthropogenic influence. |
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