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| Titel |
Identifying the origin and geochemical evolution of groundwater using hydrochemistry and stable isotopes in the Subei Lake basin, Ordos energy base, Northwestern China |
| VerfasserIn |
F. Liu, X. Song, L. Yang, Y. Zhang, D. Han, Y. Ma, H. Bu |
| 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. 1 ; Nr. 19, no. 1 (2015-01-28), S.551-565 |
| Datensatznummer |
250120608
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| Publikation (Nr.) |
 copernicus.org/hess-19-551-2015.pdf |
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| Zusammenfassung |
| A series of changes in groundwater systems caused by
groundwater exploitation in energy base have been of great concern to
hydrogeologists. The research aims to identify the origin and geochemical
evolution of groundwater in the Subei Lake basin under the influence of human
activities. Water samples were collected, and major ions and stable isotopes
(δ18O, δD) were analyzed. In terms of hydrogeological
conditions and the analytical results of hydrochemical data, groundwater can
be classified into three types: the Quaternary groundwater, the shallow
Cretaceous groundwater and the deep Cretaceous groundwater. Piper diagram and
correlation analysis were used to reveal the hydrochemical characteristics
of water resources. The dominant water type of the lake water was Cl-Na type,
which was in accordance with hydrochemical characteristics of inland salt
lakes; the predominant hydrochemical types for groundwater were HCO3–Ca, HCO3–Na and
mixed HCO3–Ca–Na–Mg types. The
groundwater chemistry is mainly controlled by dissolution/precipitation of
anhydrite, gypsum, halite and calcite. The dedolomitization and cation
exchange are also important factors. Rock weathering is confirmed to play a
leading role in the mechanisms responsible for the chemical composition of
groundwater. The stable isotopic values of oxygen and hydrogen in
groundwater are close to the local meteoric water line, indicating that
groundwater is of modern local meteoric origin. Unlike significant
differences in isotopic values between shallow groundwater and deep
groundwater in the Habor Lake basin, shallow Cretaceous groundwater and deep
Cretaceous groundwater have similar isotopic characteristics in the Subei Lake
basin. Due to the evaporation effect and dry climatic conditions, heavy isotopes
are more enriched in lake water than in groundwater. The low slope of the
regression line of δ18O and δD in lake water could be
ascribed to a combination of mixing and evaporation under conditions of low
humidity. Comparison of the regression line for δ18O and
δD showed that lake water in the Subei Lake basin contains more heavily isotopic
composition than that in the Habor Lake basin, indicating that lake water in the
discharge area has undergone stronger evaporation than lake water in the recharge area.
Hydrochemical and isotopic information of utmost
importance has been provided to decision makers by the present study so that
a sustainable groundwater management strategy can be designed for the
Ordos energy base. |
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