Publication Date:
2022-06-08
Description:
Graciosa Island is located in the Azores Archipelago, along the so-called Terceira Rift, NE boundary of the Azores Plateau. From
the hydrochemical point of view, two types of Na-Cl groundwater systems were identified: a cold aquifer system emerging at
springs and exploited through boreholes for public water supply with different degrees of mineralization, and a hydrothermal
system with issuing temperatures around 45 ºC. Geothermometers applied to the thermal waters point to deep temperature around
167 ºC and to immature waters, not reaching complete equilibrium with the reservoir rock. The isotopic composition and
geochemistry of the thermal waters indicate mixture groundwater - seawater in different percentages and ion-exchange
mechanisms that will be able to: i) increase groundwater salinity, ii) strongly change the isotopic composition to more enriched
values, with different degrees of mixing.
Description:
Published
Description:
630-633
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
N/A or not JCR
Keywords:
Thermal waters
;
Volcanic island
;
seawater-groundwater mixture
;
Azores (Portugal)
;
03.02. Hydrology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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