Geochemistry of two contrasting deep fluids in the Sardinia microplate (western Mediterranean): Relationships with tectonics and heat sources

Paternoster, Michele; Oggiano, G.; Sinisi, Rosa; Caracausi, Antonio; Mongelli, Giovanni

doi:10.1016/j.jvolgeores.2017.02.011

Cited by 22 publications

(13 citation statements)

References 69 publications

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“…We propose that old (22–41 Ma) apatite grains were contaminated by He released at higher depth and carried by hydrothermal fluids, which also induce REE mobility. This is supported by the occurrence of 4 He rich hydrothermal fluids circulating along fault systems within granitic basement geothermal fields (Jiang et al, ; Paternoster, Oggiano, Sinisi, Caracausi, & Mongelli, ). In such a setting, the 3 He/ 4 He ratio is much lower than in air‐saturated waters or in the mantle thus indicating that 4 He is mainly radiogenic and derived from the decay of U and Th in the granitic crust.…”

Section: Discussionmentioning

confidence: 92%

Mapping a geothermal anomaly using apatite (U‐Th)/He thermochronology in the Têt fault damage zone, eastern Pyrenees, France

et al. 2019

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(U‐Th)/He ages on apatite obtained in the vicinity of the Têt fault hydrothermal system show a large variability. In the inner damage zone adjacent to the fault core, where fluid flows are concentrated, AHe ages display a large scatter (3–41 Ma) and apatite ageing. Samples from the outer damage zone show young ages with less dispersion (0.9–21.1 Ma) and apatite rejuvenation. Outside the damage zone, ages are consistent with the regional exhumation history between 20 and 12 Ma. The important age dispersion found in the damage zone is interpreted as the result of 4He mobility during fluid infiltration. Our results show that thermochronological data close to a fault should be interpreted with caution, but may offer a new tool for geothermal exploration.

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Section: Discussionmentioning

confidence: 92%

Mapping a geothermal anomaly using apatite (U‐Th)/He thermochronology in the Têt fault damage zone, eastern Pyrenees, France

et al. 2019

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“…It is hence more likely that the recorded 3 He enrichment originates in a small mantle contribution (0.8%–1.2%—estimated by the procedure described in Etiope & Sherwood Lollar, 2013). Such minor inputs of mantle He (comparable to those assessed, for instance, by Caracausi, Martelli, Nuccio, Paternoster, & Stuart, 2013; Paternoster, Oggiano, Sinisi, Caracausi, & Mongelli, 2017; Pik & Marty, 2009; Umeda & Ninomiya, 2009) could indicate mantle degassing related to the active seismic regime of that region—an instance that would also imply a CH 4 provenance completely different from ophiolite serpentinization. It is worth noticing that comparable 3 He/ 4 He signatures are characteristic also to fluid inclusions in calcite which has been sampled within a seismogenic fault in Central Italy (Smeraglia et al., 2018).…”

Section: Methods and Resultsmentioning

confidence: 69%

Multi‐kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South‐West Carpathians (Romania)

et al. 2020

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Methane occurrences displaying signatures of a possible abiotic origin had previously been reported in the South‐West Carpathians (Romania). Such an accumulation, at Tisoviţa, was intercepted by a well drilled in an ophiolitic rocks massif, whereas in two other localities—situated tens of kilometres faraway—the concerned methane is released via thermal groundwater outflows that are apparently not associated with any ultramafic products. By using groundwater ionic compositions, corroborated with previously published isotopic (13C‐CH4, 2H‐CH4, 3He/4He) and molecular gas analyses, we assessed in more detail the conjectured abiotic provenance of methane, and quantitatively investigated the hypothesis of a progressive mixing between two, abiotic and thermogenic, methane end‐members. The corresponding geofluids behaviour was modelled by hypothesizing a “concealed” ophiolite serpentinization setting (largely similar to that at Tisoviţa), whose abiotic methane production was “diverted” towards remote discharges at ground surface, via a ~20‐km‐long flowpath supposedly generated by recently operating extensional tectonics.

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“…The island is about 180 km off the mainland coast with an area of 24,090 sq km and a population of 1.6 million subdivided into 4 provinces and a total of 377 municipalities. The geology of the island is complex and consists of a crystalline basement related to the European Variscan belt, in which igneous and metamorphic rocks, mainly consisting of granite and basalt, are surrounded by sedimentary rocks essentially composed of limestone and dolomite [ 27 , 28 ]. The hydrogeological constitution of the island is remarkably heterogenous and includes a central-northern mountainous site laying on a granite base of plutonic rocks whose waters, low in pH, are poor in minerals and interact with rocks during many years of flow in generally impermeable layers following the various fault systems that have occurred over the course of orogeny [ 27 ], whereas, the surrounding sedimentary rocks are especially rich in magnesium and calcium [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Water Quality and Mortality from Coronary Artery Disease in Sardinia: A Geospatial Analysis

et al. 2021

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The role of water hardness on human health is still debated, ranging from beneficial to harmful. Before the rise of drinking bottled water, it was a common habit to obtain supplies of drinking water directly from spring-fed public fountains. According to the geographic location, spring waters are characterized by a variable content of mineral components. In this ecological study, for the first time in Sardinia, Italy, the spatial association between spring water quality/composition and standardized mortality ratio (SMR) for coronary artery disease (CAD) in the decade from 1981 to 1991 was investigated using data retrieved from published databases. In a total of 377 municipalities, 9918 deaths due to CAD, including acute myocardial infarction (AMI), ICD-9 code 410, and ischemic heart disease (IHD), ICD-9 code 411–414, were retrieved. A conditional autoregressive model with spatially structured random effects for each municipality was used. The average SMR for CAD in municipalities with a predominantly “soft” (<30 mg/L) or “hard” (≥30 mg/L) water was, respectively, 121.4 ± 59.1 vs. 104.7 ± 38.2 (p = 0.025). More specifically, an inverse association was found between elevated calcium content in spring water and cardiovascular mortality (AMI: r = −0.123, p = 0.032; IHD: r = −0.146, p = 0.009) and borderline significance for magnesium (AMI: r = −0.131, p = 0.054; IHD: r = −0.138, p = 0.074) and bicarbonate (IHD: r = −0.126, p = 0.058), whereas weak positive correlations were detected for sodium and chloride. The lowest CAD mortality was observed in geographic areas (North-West: SMR 0.92; South-East: SMR 0.88), where calcium- and bicarbonate-rich mineral waters were consumed. Our results, within the limitation of an ecological study, confirm the beneficial role of waters with high content in calcium and bicarbonate against coronary artery disease.

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Geochemistry of two contrasting deep fluids in the Sardinia microplate (western Mediterranean): Relationships with tectonics and heat sources

Cited by 22 publications

References 69 publications

Mapping a geothermal anomaly using apatite (U‐Th)/He thermochronology in the Têt fault damage zone, eastern Pyrenees, France

Mapping a geothermal anomaly using apatite (U‐Th)/He thermochronology in the Têt fault damage zone, eastern Pyrenees, France

Multi‐kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South‐West Carpathians (Romania)

Water Quality and Mortality from Coronary Artery Disease in Sardinia: A Geospatial Analysis

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