The isotopic and chemical composition of CO2-rich thermal waters in the Mont-Dore region (Massif-Central, France)

Pauwels, Hélène; Fouillac, C.; Goff, Fraser; Vuataz, François-David

doi:10.1016/s0883-2927(97)00010-3

Cited by 45 publications

(21 citation statements)

References 42 publications

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“…18 O towards more depleted values has been reported in cold, CO 2 -rich waters from other volcanically active areas in Iceland (Snfellsnes, Arnó rsson and Barnes, 1983; Kristmannsdó ttir and Sveinbjoernsdó ttir, 2012); Brimstone Basin in Yellowstone national park (Bergfeld et al, 2012); Malawi Rift in Tanzania (Delalande et al, 2011), as well as from several non-volcanic areas with high CO 2 flux (Vuataz and Goff, 1986;Matthews et al, 1987;Pauwels et al, 1997;Cartwright et al, 2002). The operating mechanism is believed to be isotopic equilibration between CO 2 from a deep thermal source and shallow, cold, groundwater (Bergfeld et al, 2012 and references therein).…”

Section: The Water Isotopes (Dd and Dmentioning

confidence: 80%

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Degassing regime of Hekla volcano 2012–2013

Ilyinskaya

Aiuppa

Bergsson

et al. 2015

Geochimica et Cosmochimica Acta

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Hekla is a frequently active volcano with an infamously short pre-eruptive warning period. Our project contributes to the ongoing work on improving Hekla's monitoring and early warning systems. In 2012 we began monitoring gas release at Hekla. The dataset comprises semi-permanent near-real time measurements with a MultiGAS system, quantification of diffuse gas flux, and direct samples analysed for composition and isotopes (d 13 C, dD and d 18 O). In addition, we used reaction path modelling to derive information on the origin and reaction pathways of the gas emissions.Hekla's quiescent gas composition was CO 2 -dominated (0.8 mol fraction) and the d À1 are sourced from a small area at the volcano's summit. There was no detectable gas flux at other craters, even though some of them had higher ground temperatures and had erupted more recently.Our measurements are consistent with a magma reservoir at depth coupled with a shallow dike beneath the summit. In the current quiescent state, the composition of the exsolved gas is substantially modified along its pathway to the surface through cooling and interaction with wall-rock and groundwater. The modification involves both significant H 2 O condensation and scrubbing of S-bearing species, leading to a CO 2 -dominated gas emitted at the summit. We conclude that a compositional shift towards more S-and H 2 O-rich gas compositions if measured in the future by the permanent MultiGAS station should be viewed as sign of imminent volcanic unrest on Hekla.

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Section: The Water Isotopes (Dd and Dmentioning

confidence: 80%

“…O while H 2 O becomes relatively depleted; this has been observed in several areas with high CO 2 degassing (Arnó rsson and Barnes, 1983;Vuataz and Goff, 1986;Matthews et al, 1987;Pauwels et al, 1997;Cartwright et al, 2002;Delalande et al, 2011;Bergfeld et al, 2012).…”

mentioning

confidence: 79%

Degassing regime of Hekla volcano 2012–2013

Ilyinskaya

Aiuppa

Bergsson

et al. 2015

Geochimica et Cosmochimica Acta

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“…5, where the Local Meteoric Water Line (LMWL; Hoke et al, 2013) is also reported, indicates that the aquifers feeding the fluid discharges from both domains had a meteoric origin. Few samples (21, 35, 45 and 46) showed a significant 18 O-depletion likely due to isotopic exchange between liquid water and CO 2 (Epstein and Mayeda, 1953), a process that typically affects CO 2 -rich bubbling pools (Pauwels et al, 1997) and HCO 3 − rich hydrothermal waters (Peiffer et al, 2014). On the contrary, the strong enrichments in both Fig.…”

Section: Chemical and Stable Isotopic (δ 18mentioning

confidence: 99%

Chemical and isotopic features of cold and thermal fluids discharged in the Southern Volcanic Zone between 32.5°S and 36°S: Insights into the physical and chemical processes controlling fluid geochemistry in geothermal systems of Central Chile

et al. 2016

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The Principal Cordillera of Central Chile is characterized by two belts of different ages and lithologies: (i) an eastern Mesozoic belt, consisting of limestone-and gypsum-rich sedimentary rocks at the border between Central Chile and Argentina, where the active volcanic arc occurs; and (ii) a western belt of Cenozoic age containing basaltic to andesitic volcanic and volcanoclastic sequences. This distinctive geological setting controls water chemistry of cold and thermal springs in the region, which are fed by meteoric water that circulates through deep regional structures. In the western sector of Principal Cordillera, water-rock interaction processes produce low TDS, slightly alkaline HCO 3 − dominated waters, although dissolution of underlying Mesozoic evaporitic rocks occasionally causes SO 4 2− and Cl − enrichments. In this area, few Na dolomite, anhydrite, fluorite, albite, K-feldspar and Ca-and Mg-saponites at a broad range of temperatures (up tõ 300°C) In the associated gas phase, equilibria of chemical reactions characterized by slow kinetics (e.g. sabatier reaction) suggested significant contributions from hot and oxidizing magmatic gases. This hypothesis is consistent with the δ 13 C-CO 2 , Rc/Ra, CO 2 / 3 He values of the fumarolic gases. Accordingly, the isotopic signatures of the fumarolic steam is similar to that of fluids discharged from the summit craters of the two active volcanoes in the study area (Tupungatito and Planchón-Peteroa). These results encourage the development of further geochemical and geophysical surveys aimed to provide an exhaustive evaluation of the geothermal potential of these volcanic-hydrothermal systems.

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“…A significant proportion of the thermal water sources contain phenolic type compounds and other organic materials such as polycyclic aromatic hydrocarbons and in many cases humates [1]. The composition of these water resources depends mostly on the mineral composition of the rocks which were in contact with the water [2]. Some of the most abundant water soluble pollutants are the different types of phenolic OH containing organic compounds (phenols).…”

Section: Introductionmentioning

confidence: 99%

New Insights on the Simultaneous Removal by Adsorption on Organoclays of Humic Acid and Phenol

Szabó

Pap

Simon

et al. 2016

Water

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Abstract:The exploitation of thermal water as a heat source in houses and apartments (during winter) is a widely used alternative to natural gas. However, this type of water may contain organic contaminants, which must be removed before releasing the used water into rivers and lakes. Because of the presence of a wide range of pollutants (including phenolic compounds and humates), efficient, cheap removal processes are needed. In order to demonstrate their capability in thermal water cleaning, clay minerals were applied for the removal of phenol and humic acid via adsorption. To determine the most efficient removal strategy for the aforementioned pollutants, the following parameters were investigated: the type of the clay mineral, the organophilization strategy (in situ or pre-organophilization), and the individual or simultaneous removability of the model pollutants. The current study revealed that the applied low cost, in situ prepared clay mineral adsorbents are applicable in the removal of pollutants from thermal water.

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The isotopic and chemical composition of CO2-rich thermal waters in the Mont-Dore region (Massif-Central, France)

Cited by 45 publications

References 42 publications

Degassing regime of Hekla volcano 2012–2013

Degassing regime of Hekla volcano 2012–2013

Chemical and isotopic features of cold and thermal fluids discharged in the Southern Volcanic Zone between 32.5°S and 36°S: Insights into the physical and chemical processes controlling fluid geochemistry in geothermal systems of Central Chile

New Insights on the Simultaneous Removal by Adsorption on Organoclays of Humic Acid and Phenol

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