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| Titel |
Groundwater flow processes and mixing in active volcanic systems: the case of Guadalajara (Mexico) |
| VerfasserIn |
A. Hernández-Antonio, J. Mahlknecht, C. Tamez-Meléndez, J. Ramos-Leal, A. Ramírez-Orozco, R. Parra, N. Ornelas-Soto, C. J. Eastoe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 9 ; Nr. 19, no. 9 (2015-09-24), S.3937-3950 |
| Datensatznummer |
250120812
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| Publikation (Nr.) |
 copernicus.org/hess-19-3937-2015.pdf |
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| Zusammenfassung |
| Groundwater chemistry and isotopic data from 40 production wells in the
Atemajac and Toluquilla valleys, located in and around the Guadalajara
metropolitan area, were determined to develop a conceptual model of
groundwater flow processes and mixing. Stable water isotopes (δ2H, δ18O) were used to trace hydrological processes and
tritium (3H) to evaluate the relative contribution of modern water in
samples. Multivariate analysis including cluster analysis and principal
component analysis were used to elucidate distribution patterns of
constituents and factors controlling groundwater chemistry. Based on this
analysis, groundwater was classified into four groups: cold groundwater,
hydrothermal groundwater, polluted groundwater and mixed groundwater. Cold
groundwater is characterized by low temperature, salinity, and Cl and Na
concentrations and is predominantly of Na-HCO3-type. It originates as
recharge at "La Primavera" caldera and is found predominantly in wells in the
upper Atemajac Valley. Hydrothermal groundwater is characterized by high
salinity, temperature, Cl, Na and HCO3, and the presence of minor elements
such as Li, Mn and F. It is a mixed-HCO3 type found in wells from
Toluquilla Valley and represents regional flow circulation through basaltic
and andesitic rocks. Polluted groundwater is characterized by elevated
nitrate and sulfate concentrations and is usually derived from urban water
cycling and subordinately from agricultural return flow. Mixed groundwaters
between cold and hydrothermal components are predominantly found in the
lower Atemajac Valley. Twenty-seven groundwater samples contain at least a
small fraction of modern water. The application of a multivariate mixing
model allowed the mixing proportions of hydrothermal fluids,
polluted waters and cold groundwater in sampled water to be evaluated. This study will help
local water authorities to identify and dimension groundwater contamination,
and act accordingly. It may be broadly applicable to other active volcanic
systems on Earth. |
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