Major ion chemistry of groundwater from perched-water bodies of the Azores (Portugal) volcanic archipelago |
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| Institution: | 1. Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, via Campi 103, 41125 Modena, Italy;2. Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, 44122 Ferrara, Italy;3. Research and Teaching Centre for Earthquake Geology, Tymavos, Greece;1. University of Vienna, Department of Environmental Geosciences, Althanstrasse 14, UZA2, 1090 Vienna, Austria;2. University of Vienna, Department of Mathematics, Oskar-Morgenstern-Platz 1, 1090 Vienna, Austria |
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| Abstract: | A dataset of major ion composition of 246 samples from cold-water springs discharging from perched-water bodies at volcanic islands (Azores archipelago, Portugal) reveal waters with low mineralization, which evolve due to two main geochemical processes: (1) seawater spraying and (2) dissolution of primary minerals of volcanic rocks. As a result, water facies range from Na–Cl to Na–HCO3 type waters. The relationship between alkali, alkali–earth metals and HCO3? shows differences between waters discharging from perched-water bodies in basaltic rocks comparing to more evolved rocks of trachytic nature. The use of principal component analysis shows that water-rock interaction is limited, which is compatible with the geochemical observations and with the hydrogeological environment. |
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