The chemistry and isotopic composition of waters in the low-enthalpy geothermal system of Cimino-Vico Volcanic District, Italy

Battistel, Maria; Hurwitz, Shaul; Evans, William C.; Barbieri, Maurizio

doi:10.1016/j.jvolgeores.2016.11.005

Cited by 34 publications

(14 citation statements)

References 59 publications

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“…Using stable isotopes of water as a tracer is a well-established discipline in hydrogeological studies that allows the differentiation of water exposed to different physical processes relating to precipitation and evaporation [27]. Its use has been applied with multiple objectives [28]: To quantify recharge sources [29][30][31], for climate assessment [32], or to evaluate water origin in lakes [33] or hydrothermal systems [34,35]. The continuous improvement in analytical techniques has enabled researchers to quantify 18 O and 2 H with small volumes of water through a simple and direct sampling system.…”

Section: Introductionmentioning

confidence: 99%

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Duque

Jessen

Tirado-Conde

et al. 2019

Water

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Submarine groundwater discharge (SGD)—including terrestrial freshwater, density-driven flow at the saltwater–freshwater interface, and benthic exchange—can deliver nutrients to coastal areas, generating a negative effect in the quality of marine water bodies. It is recognized that water stable isotopes (18O and 2H) can be helpful tracers to identify different flow paths and origins of water. Here, we show that they can be also applied when assessing sources of nutrients to coastal areas. A field site near a lagoon (Ringkøbing Fjord, Denmark) has been monitored at a metric scale to test if stable isotopes of water can be used to achieve a better understanding of the hydrochemical processes taking place in coastal aquifers, where there is a transition from freshwater to saltwater. Results show that 18O and 2H differentiate the coastal aquifer into three zones: Freshwater, shallow, and deep saline zones, which corresponded well with zones having distinct concentrations of inorganic phosphorous. The explanation is associated with three mechanisms: (1) Differences in sediment composition, (2) chemical reactions triggered by mixing of different type of fluxes, and (3) biochemical and diffusive processes in the lagoon bed. The different behaviors of nutrients in Ringkøbing Fjord need to be considered in water quality management. PO4 underneath the lagoon exceeds the groundwater concentration inland, thus demonstrating an intra-lagoon origin, while NO3, higher inland due to anthropogenic activity, is denitrified in the study area before reaching the lagoon.

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Section: Introductionmentioning

confidence: 99%

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Duque

Jessen

Tirado-Conde

et al. 2019

Water

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“…Generally, the Mt. Vulture groundwaters have higher B concentrations compared with those in other volcanic systems in Italy [40,41]. The δ 11 B values range from −16.1‰ to +23‰ (Figure 3(b)).…”

Section: B Concentrations and Isotopes Boron Contents And δ 11 Bmentioning

confidence: 95%

Boron Isotopes in the Mount Vulture Groundwaters (Southern Italy): Constraints for the Assessment of Natural and Anthropogenic Contaminant Sources

Paternoster

2019

Geofluids

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The Mt. Vulture volcanic aquifer is an important reservoir of effervescent mineral water in southern Italy. This area is included in the Vulture Regional Park and is located on a popular tourist route for its high scenic and ecological value. Unfortunately, signs of anthropogenic impact have recently increased. Among minor elements, boron and its isotopes are considered useful environmental tracers since different anthropogenic and natural sources can be distinguished. In this study, B content and (δ11B) isotope composition were determined in the Mt. Vulture groundwaters. The groundwater chemistry is strongly influenced by input of CO2-rich volcanic gases, and two different hydrofacies are observed. The first water type (BAW) has bicarbonate alkaline and alkaline-earth composition and relatively low salinity, whereas the second one (HSW) has bicarbonate-sulphate alkaline composition and higher salinity. The HSW are enriched in boron and have low δ11B values (from –9.6‰ to –4.3‰) similar to those measured in the local magmas suggesting that B contents in these waters are influenced by prolonged interaction between local meteoric water and volcanic rocks. As to BAW, a wide variability in B concentrations (from 14 μg/l to 769 μg/l) and B isotope composition (from -16.1‰ to +23‰) has been observed. A possible anthropogenic input is thought to be responsible for such variability. The water samples with high B concentrations and negative δ11B values (−12.2‰ to −16.1‰) are probably influenced by agricultural activities; for water samples characterized by positive δ11B values (from +5.8‰ to +7.9‰) and low B contents, a slight contamination by sewage effluents cannot be excluded. These conclusions are also supported by B/Cl molar ratios (7.8E−3 to 1.6E−2) different from those of the HSW group (1.1E−2 to 7.0E−2). This study highlights that also in the Mt. Vulture volcanic area B isotopes coupled to the B/Cl ratio can be a useful tool for the assessment of natural and anthropogenic contaminant sources.

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“…Nevertheless, low (30°C to 100°C) to medium (100 -150°C) enthalpy geothermal systems have 29 been recently subject to increasing interest (Blasco et al, 2017;Capecchiacci et al, 2015;Fusari 30 et al, 2017) as they may be easily exploited for ground-source heat pump or greenhouses 31 (Battistel et al, 2016). In the current context of global warming and energy transition, 32 geothermal is generally considered to be an environmentally advantageous renewable source 33 of energy.…”

Section: Introduction 26mentioning

confidence: 99%

Role of CO2 in low to medium enthalpy geothermal systems in the Central Betic Cordillera (Spain)

Lix

Zuddas

Guichet

et al. 2020

Science of The Total Environment

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3There is growing interest in geothermal energy, which is considered as an efficient energy 4 solution to mitigate rising atmospheric CO2. Besides known high enthalpy geothermal systems, 5 increasing attention is paid to low temperature geothermal systems, as they are suitable for local 6 use. Although geothermal production seems to be an environmentally advantageous renewable 7 energy, it might result in significant CO2 emissions. In this study, we investigate the relationship 8 between temperature, fugacity of CO2 (fCO2), and mineral buffers in the reservoir conditions, 9 taking the low-to medium-enthalpy thermal waters in the Central Betic Cordillera as case 10 study. Using geochemical modeling, three main groups of waters have been identified 11 depending on temperature, buffering mineral assemblage, and fCO2 in their reservoir. A group 12 of waters with a reservoir temperature ranging from 70 to 90°C and located in the intramountain 13 sedimentary basins shows a fCO2 in depth ranging from ~ 6 x10 -2 and 6 x10 -1 . The reservoir 14 chemistry of this water group seems to be mainly controlled by carbonates and evaporites 15 displaying a fCO2 variation between depth and surface (ΔfCO2) of 10 -1 . Another intermediate 16 group of waters, located in an active extension zone, displays lower temperature (50-60°C) and 17 fCO2 in the reservoir (from 10 -3 to 10 -2 ). Finally, the third group of waters, located on the 18 metamorphic complexes contacts, show the highest estimated temperatures (130 -140°C) and 19 fCO2 in the reservoir (1 to 10 2 ). The two latter groups suggest increasing buffering effect of 20 alumino-silicates, in addition to carbonates and quartz. Therefore, we evidenced a strong 21 relationship between temperature and fCO2 in the reservoir as well as the potential mineral 22 buffers. We discussed the potential of geothermal systems as clean energy source based on the 23 estimation of the CO2 emissions generated by the investigated thermal systems for a practical 24 case of household heating. 25 chemical water-rock interactions, is an important parameter to consider as it "buffers" the fluid 51 chemical composition and the CO2 degassing. Therefore, understanding the relationship 52 between the mineral buffer, the fugacity of CO2 (fCO2) (or its partial pressure of CO2, pCO2), 53 and the temperature in the reservoir, is crucial to estimate the CO2 release in geothermal 54 systems. These links between fCO2 and reservoir temperature have been subject to Chiodini 55 and collaborators' investigations since the early 1990's, although they focused mainly on 56 volcanic geothermal systems (e.g., Chiodini et al.

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The chemistry and isotopic composition of waters in the low-enthalpy geothermal system of Cimino-Vico Volcanic District, Italy

Cited by 34 publications

References 59 publications

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Boron Isotopes in the Mount Vulture Groundwaters (Southern Italy): Constraints for the Assessment of Natural and Anthropogenic Contaminant Sources

Role of CO2 in low to medium enthalpy geothermal systems in the Central Betic Cordillera (Spain)

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