Paleowaters in Silurian-Devonian carbonate aquifers: Geochemical evolution of groundwater in the Great Lakes region since the Late Pleistocene

McIntosh, Jennifer C.; Walter, Lynn M.

doi:10.1016/j.gca.2006.02.002

Cited by 106 publications

(87 citation statements)

References 61 publications

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“…A = Sarnia younger-water lobe; B = periphery of central modern water zone; C = Ridgetown modern-water lobe; and D = Ipperwash Trough transitional-waters The strong correlation between CH 4(aq) in shale and in glacial sediments overlying the shale (Hamilton 2015) indicate a geologically rapid loss of reduced carbon that could not have been sustained since the Paleozoic Era. This supports the theory that the onset of biogenic CH 4 production followed removal of shale-hosted brines by glacial meltwater during and after the Pleistocene (McIntosh and Walter 2006). Regional pumping of the aquifer appears to have accelerated the natural post-glacial brine removal and replacement by bicarbonate-dominant waters in shales, thereby enhancing modern biogenic methane production and associated dissolved products.…”

Section: Groundwater Geochemistrysupporting

confidence: 79%

“…A secondary peak is centered near −17‰ for both overburden and bedrock wells. The latter peak is within the range of estimated glacial meltwater in the Great Lakes region (Clayton et al 1966;McNutt et al 1987;Long et al 1988;Husain et al 2004;McIntosh and Walter 2006). The larger peak is slightly lower than the center of the estimated range of modern recharge (~10‰) in the Devonian shale area (Husain et al 2004).…”

Section: Isotopes Of Groundwatermentioning

confidence: 55%

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The effect of long-term regional pumping on hydrochemistry and dissolved gas content in an undeveloped shale-gas-bearing aquifer in southwestern Ontario, Canada

et al. 2015

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Baseline groundwater geochemical mapping of inorganic and isotopic parameters across 44,000 km 2 of southwestern Ontario (Canada) has delineated a discreet zone of natural gas in the bedrock aquifer coincident with an 8,000-km 2 exposure of Middle Devonian shale. This study describes the ambient geochemical conditions in these shales in the context of other strata, including Ordovician shales, and discusses shale-related natural and anthropogenic processes contributing to hydrogeochemical conditions in the aquifer. The three Devonian shales-the Kettle Point Formation (Antrim equivalent), Hamilton Group and Marcellus Formation-have higher DOC, DIC, HCO 3 , CO 2(aq) , pH and iodide, and much higher CH 4(aq). The two Ordovician shales-the Queenston and Georgian-Bay/Blue Mountain Formations-are higher in Ca, Mg, SO 4 and H 2 S. In the Devonian shale region, isotopic zones of Pleistoceneaged groundwater have halved in size since first identified in the 1980s; potentiometric data implicate regional groundwater extraction in the shrinkage. Isotopically younger waters invading the aquifer show rapid increases in CH 4(aq) , pH and iodide with depth and rapid decrease in oxidized carbon species including CO 2 , HCO 3 and DIC, suggesting contemporary methanogenesis. Pumping in the Devonian shale contact aquifer may stimulate methanogenesis by lowering TDS, removing products and replacing reactants, including bicarbonate, derived from overlying glacial sedimentary aquifers.

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Section: Groundwater Geochemistrysupporting

confidence: 79%

Section: Isotopes Of Groundwatermentioning

confidence: 55%

The effect of long-term regional pumping on hydrochemistry and dissolved gas content in an undeveloped shale-gas-bearing aquifer in southwestern Ontario, Canada

et al. 2015

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“…Respiration of organic C by heterotrophic bacteria (as well as other groups) results in 13 C-depleted CO 2 that subsequently lowers the δ 13 C value of DIC (Peterson & Fry 1987, Chapelle & McMahon 1991, Nascimento et al 1997, Keough et al 1998. The importance of respiration-derived CO 2 in the DIC pool has been observed in many aquatic systems (Bade et al 2004), has been experimentally confirmed (Keough et al 1998), and is evident throughout most of the Silurian-Devonian aquifers of northern Michigan (McIntosh & Walter 2006).…”

Section: Discussionmentioning

confidence: 82%

Benthic macroinvertebrate and fish communities in Lake Huron are linked to submerged groundwater vents

Sanders¹,

Biddanda²,

Stricker³

et al. 2011

Aquat. Biol.

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“…The average CAI values for pre-and post-monsoon seasons, respectively, are: −3.15 and −1.63 (CAI-1), and −0.29 and −0.33 (CAI-2) ( Table 3). The CAI-1 and CAI-2 values of almost all samples are negative, indicating that the ion-exchange processes involved are between Na + +K + of the host rock and Ca 2+ +Mg 2+ of water, and the exchange is indirect during the evolution of the subsurface water chemistry (McIntosh and Walter 2006). Therefore, ion exchange is also responsible for the increase of ions in the groundwater.…”

Section: Hydrochemical Facies and Solute Acquisition Processesmentioning

confidence: 93%

Fluoride hazard and assessment of groundwater quality in the semi-arid Upper Panda River basin, Sonbhadra district, Uttar Pradesh, India

Raju

Dey

Goßel

et al. 2012

Hydrological Sciences Journal

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Around 9000 inhabitants in the Panda River basin, Sonbhadhra District, Uttar Pradesh, India, are vulnerable to a "silent" dental and skeletal fluorosis from groundwater consumption. The fluoride source and seasonal groundwater quality variation were studied by collecting 65 groundwater samples in the Upper Panda River basin. Major rock types are phyllites and granite gneissic rocks. Fluoride concentrations are in the range 0.4-5.6 mg/L in the pre-monsoon season and 0.1-6.7 mg/L in the post-monsoon season. Fluor-apatite and biotite mica in the granite gneissic rock were identified as the main provenance of fluoride in the groundwater through water-rock interactions. Due to precipitation of calcium, soils become alkaline with high contents of sodium; these conditions allow fluoride to accumulate in water. According to risk index calculations, the fluoride-affected villages were shown to fall in the fluoride risk zone (with a risk index of around 1.7). On the basis of mineral stability diagrams, groundwater from the weathered and fractured aquifers appears to be stable within the kaolinite field, suggesting weathering of silicate minerals. The groundwater is chemically potable and suitable for domestic and agricultural purposes, except for a few wells in the southern region that are contaminated with high amounts of fluoride.Key words fluoride hazard; hydrogeochemistry; chemical relationships; seasonal groundwater quality; irrigation use; Panda River, IndiaRisques liés au fluor et évaluation de la qualité des eaux souterraines dans le bassin supérieur semi-aride de la rivière Panda, district de Sonbhadra (Uttar Pradesh, Inde) Résumé Dans le bassin de la rivière Panda, district de Sonbhadhra, Uttar Pradesh, environ 9000 habitants sont exposés à un fluorose dentaire et osseuse silencieuse dûe à la consommation des eaux souterraines. La source des fluorures, et la variabilité saisonnière de la qualité des eaux souterraines, ont été étudiées par la collecte de 65 échantillons d'eau souterraine dans le bassin supérieur de la rivière Panda. Les grands types de roches sont des phyllites et des granito-gneiss. Les concentrations en fluorures sont dans la gamme de 0,4 à 5,6 mg/L dans la saison précédant la mousson, et de 0,1 à 6,7 mg/L dans la saison suivant la mousson. Le fluor de l'apatite et le mica des biotites dans le granito-gneiss ont été identifiés comme la principale source des fluorures dans l'eau souterraine par le biais des interactions eau-roche. En raison de la précipitation du calcium, les sols deviennent alcalins avec des teneurs élevées en sodium ; ces conditions permettent aux fluorures de s'accumuler dans l'eau. Selon les calculs de l'indice de risque, les villages exposés au fluor se retrouvent dans la zone à risque (avec un indice de risque d'environ 1,7). Sur la base des diagrammes de stabilité des minéraux, les eaux souterraines des aquifères des zones altérées et fracturées apparaissent stables dans le domaine de la kaolinite, suggérant un altération des minéraux silicatés. L'eau souterraine...

show abstract

Paleowaters in Silurian-Devonian carbonate aquifers: Geochemical evolution of groundwater in the Great Lakes region since the Late Pleistocene

Cited by 106 publications

References 61 publications

The effect of long-term regional pumping on hydrochemistry and dissolved gas content in an undeveloped shale-gas-bearing aquifer in southwestern Ontario, Canada

The effect of long-term regional pumping on hydrochemistry and dissolved gas content in an undeveloped shale-gas-bearing aquifer in southwestern Ontario, Canada

Benthic macroinvertebrate and fish communities in Lake Huron are linked to submerged groundwater vents

Fluoride hazard and assessment of groundwater quality in the semi-arid Upper Panda River basin, Sonbhadra district, Uttar Pradesh, India

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