Acquisition des ions alcalino-terreux par les eaux thermales carbogazeuses

Michard, Gil; Fouillac, C.; Evrard, Maxime; Lambret, Bernard

doi:10.1016/0012-821x(78)90007-9

Cited by 23 publications

(5 citation statements)

References 8 publications

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“…High 226 Ra activity concentrations in waters for these three sampling sites could be attributed to the distribution of the Alpine granitoides in this area and also to excess of CO 2 in waters from these locations. Barker and Johnson (1964) and Wollenberg (1975) pointed out the higher solubility of radium in presence of aqueous carbonates, probably indirectly due to the stronger leaching of alkaline-earth cations by CO 2 -rich acidic waters rather than due to RaCO 3 0 complexing (Michard et al, 1978). In Serbia, the enrichment of spring waters in 226 Ra (2.28 Bq L − 1 ) in the limestone region (Studenica), where radium is more soluble in CO 2 -rich waters, was reported by Joksić et al (2007).…”

Section: Resultsmentioning

confidence: 97%

Spatial distribution of the 226Ra activity concentrations in well and spring waters in Serbia and their relation to geological formations

Dragović

Janković-Mandić

Dragović

et al. 2012

Journal of Geochemical Exploration

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Section: Resultsmentioning

confidence: 97%

Spatial distribution of the 226Ra activity concentrations in well and spring waters in Serbia and their relation to geological formations

Dragović

Janković-Mandić

Dragović

et al. 2012

Journal of Geochemical Exploration

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“…. Sources: Glover (1972), Kamondo (1988), Allen et al (1989), Allen and Darling (1992), Dunkley et al (1993) and Renaut et al (2002) Losses of dissolved Mg may occur during precipitation of Mg-bearing silicates (Bischoff and Dickson, 1975;Michard et al, 1978;Stoessell and Hay, 1978;Edmond et al, 1979;Jones, 1986;Gislason and Eugster, 1987;Paquet et al, 1987;Pflumio et al, 1994;Deocampo, 2004a,b). The thermal group (TDS > 2800 mg l 1 ) is depleted in Mg (Mg < 0Ð73 mg l 1 ) when compared with the non-thermal waters of the Baringo basin (Table III) (Dunkley et al, 1993).…”

Section: Geochemical Characteristics Of the Ol Kokwe Thermal Systemmentioning

confidence: 96%

Geochemical evidence of hydrothermal recharge in Lake Baringo, central Kenya Rift Valley

et al. 2006

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Lake Baringo, a freshwater lake in the central Kenya Rift Valley, is fed by perennial and ephemeral rivers, direct rainfall, and hot springs on Ol Kokwe Island near the centre of the lake. The lake has no surface outlet, but despite high evaporation rates it maintains dilute waters by subsurface seepage through permeable sediments and faulted lavas. New geochemical analyses (major ions, trace elements) of the river, lake, and hot spring waters and the suspended sediments have been made to determine the main controls of lake water quality. The results show that evaporative concentration and the binary mixing between two end members (rivers and thermal waters) can explain the hydrochemistry of the lake waters. Two zones are recognized from water composition. The southern part of the lake near sites of perennial river inflow is weakly influenced by evaporation, has low total dissolved species (TDS), and has a seasonally variable load of mainly detrital suspended sediments. In contrast, waters of the northern part of the lake show evidence for strong evaporation (TDS of up to eight times inflow). Authigenic clay minerals and calcite may be precipitating from those more concentrated fluids. The subaerial hot-spring waters have a distinctive chemistry and are enriched in some elements that are also present in the lake water. Comparison of the chemical composition of the inflowing surface waters and lake water shows (1) an enrichment of some species (HCO3-, Cl, SO42-, F, Na, B, V, Cr, As, Mo, Ba and U) in the lake, (2) a depletion in SiO2 in the lake, and (3) a possible hydrothermal origin for most F. The rare earth element distribution and the F/Cl and Na/Cl ratios give valuable information on the rate of mixing of the river and hydrothermal fluids in the lake water. Calculations imply that thermal fluids may be seeping upward locally into the lake through grid-faulted lavas, particularly south of Ol Kokwe Island. Copyright © 2006 John Wiley & Sons, Ltd

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“…Effectively, the Ca and Mg concentrations are very low in AC1 and AC2 geothermal fluids, whereas these components are higher in the geothermal spring waters. Furthermore, Ca and Mg are very often added to cooled waters by reaction with the rock, as observed, for instance, for the low pH thermal waters of the Massif Central (Michard et al . 1978, 1981; Criaud & Fouillac 1986).…”

Section: Resultsmentioning

confidence: 99%

Geothermal fluids circulation at Caldas do Moledo area, Northern Portugal: geochemical and isotopic signatures

Marques¹,

Marques

Carreira³

et al. 2003

Geofluids

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A hydrogeological conceptual model of the Caldas do Moledo geothermal site is proposed that shows mixing between geothermal waters and local shallow groundwaters. Stable isotope values of Caldas do Moledo geothermal waters indicate recharge areas located at relatively high altitudes (850–1250 m a.s.l.). The NW–SE Vigo–Régua shear zone plays an important role in fluid recharge and circulation towards the NNE–SSW Régua–Verin fault system, forming a path for ascent of geothermal fluids. The apparent 14C age of geothermal fluids (15.66 ± 2.86 ka BP) was estimated in the total dissolved inorganic carbon (TDIC). Geothermometer calculations indicate that, assuming a conductive temperature gradient of 32°C per kilometer for northern Portugal, the maximum depth of circulation is roughly 1.8 ± 0.4 km. The K, Ca and SO4 concentrations found in some Caldas do Moledo geothermal spring waters show mixing between deep geothermal and shallow groundwater systems. Local shallow groundwaters showing the highest SO4 concentrations were found at low elevation areas, originating from fertilisers and pesticides applied to the Port wine vineyards in the Douro River valley. Geothermal waters from boreholes AC1 and AC2 do not show evidences of direct pollution from the spreading of such agrochemicals.

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Acquisition des ions alcalino-terreux par les eaux thermales carbogazeuses

Cited by 23 publications

References 8 publications

Spatial distribution of the 226Ra activity concentrations in well and spring waters in Serbia and their relation to geological formations

Spatial distribution of the 226Ra activity concentrations in well and spring waters in Serbia and their relation to geological formations

Geochemical evidence of hydrothermal recharge in Lake Baringo, central Kenya Rift Valley

Geothermal fluids circulation at Caldas do Moledo area, Northern Portugal: geochemical and isotopic signatures

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