Past changes to isotopic and solute balances in a continental playa: clues from stable isotopes of lacustrine carbonates

Dutkiewicz, Adriana; Herczeg, Andrew L.; Dighton, John

doi:10.1016/s0009-2541(99)00169-2

Cited by 40 publications

(20 citation statements)

References 31 publications

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“…As such, these results do not significantly impact interpretations based on the d 13 C of low magnesian calcites (e.g., Saller and Moore, 1991;Carpenter et al, 1991;Carpenter and Lohmann, 1995;Rahimpour-Bonab et al, 1997). However, studies based on high magnesian calcites (Aghib et al, 1991;Dutkiewicz et al, 2000) should take into account the effect of magnesium in the interpretation of carbon isotope signatures, as deviations of 0.4& are expected compared to partitioning with pure calcite. Excursion of similar magnitude have been observed in carbon isotope stratigraphies and digenetic alterations that can now be attributed, in part, to the effect of Mg incorporation in calcite.…”

Section: Isotope Analysesmentioning

confidence: 79%

Carbon isotope fractionation in synthetic magnesian calcite

Jiménez-López

Romanek

Caballero

2006

Geochimica et Cosmochimica Acta

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Mg-calcite was precipitated at 25°C in closed system, free-drift experiments, from solutions containing NaHCO 3 , CaCl 2 and MgCl 2 . The carbon stable isotope composition of bulk solid and solution were analyzed from subsamples collected during time course experiments of 24 h duration. Considering only the Mg-content and d 13 C values for the bulk solid, the carbon isotope fractionation factor for the Mg-calcite-HCO 3(aq) À system (as 10 3 ln a Mg-clÀHCO À 3ðaqÞ ) increased with average mol percentage of Mg (X Mg ) in the solid at a rate of (0.024 ± 0.011) per mol% MgCO 3 . Extrapolation of this relationship to the pure calcite end member yields a value of 0.82 ± 0.09, which is similar to published values for the calcite-HCO 3(aq) À system. Although 10 3 ln a Mg-cl-HCO À 3ðaqÞ did not vary for precipitation rates that ranged from 10 3.21 to 10 4.60 lmol m À2 h À1 , it was not possible to hold Mg-content of the solid constant, so kinetic effect on 10 3 ln a could not be evaluated from these experiments.

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Section: Isotope Analysesmentioning

confidence: 79%

Carbon isotope fractionation in synthetic magnesian calcite

Jiménez-López

Romanek

Caballero

2006

Geochimica et Cosmochimica Acta

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“…So it indicates that during the mixing of fresh groundwater and highly mineralized brine, the water quality and δ 18 O value rise with the quantity of the mixing waters. In zone III, it is evident that δ 18 O increases with a linear logarithm relationship with Cl − and EC in the mixing process (Dutkiewicz et al 2000). .…”

Section: O Vs Ec and CLmentioning

confidence: 96%

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

et al. 2018

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A study was conducted in a coastal region of Cuddalore district of Tamil Nadu, India, to identify the hydrogeochemical processes controlling the groundwater chemistry. The major geological units of the study area are sandstone, clay, alluvium, and laterite soils of Tertiary and Quaternary age. A total of 64 groundwater samples were measured for major ions and stable isotopes. Higher electrical conductivity values indicate the poor quality groundwater along the coastal region. Saline water intrusion mainly affects the hydrochemical composition of the aquifer water reflected by Na-Cl-type waters. Cl − / (Cl − + HCO 3 − ) ratio also indicates the mixing of fresh groundwater with saline water. The results of δD and δ 18 O analyses show that isotopic compositions of groundwater ranges from − 7.7 to − 2.1‰ for δ 18 O and from − 55.6 to − 18.5‰ for δD. Correlation and factor analysis were carried out to find the association of ions and to determine the major factors controlling the groundwater chemistry of the region. The study indicates that ion exchange, weathering, salt water intrusion along the coast, and anthropogenic impacts are the major controlling factors for the groundwater chemistry of the region.

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“…Owing to inadequate supplies of surface waters, groundwater in many arid/semi‐arid basins is the only available water resource for drinking, domestic use, and agricultural and industrial development, especially in developing countries (Vanenschrick et al ; Bakalowicz ). Hence, it is of prime importance to assess the quality of groundwater resources and evaluate hydrogeochemical processes taking place in such environments (Dutkiewicza et al ; Agoubi et al ). Hydrochemical characteristics and the degradation of groundwater quality in different basins are caused by natural processes (i.e., water‐rock interaction) and anthropogenic inputs.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Groundwater Quality at Yuncheng Basin: Denotation for the Water Management in China

Gao²

2018

Groundwater

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Dramatic decreases in groundwater quality have raised widespread concerns about water supplies and ecological crises in China. In this study, hydrochemistry, stable isotopes, and graphical and multivariate statistical methods are integrated to identify hydrogeochemical processes controlling groundwater quality in the Yuncheng Basin, China. Our results show that groundwater with 21 variables (pH, temperature‐T, total dissolved solid, major‐trace elements, and stable isotopes) is chemically classified into three distinct clusters: fresh water [C1], brackish‐saline water [C2], and saline water [C3]. Groundwater salinization is identified as the prime process in controlling groundwater quality for shallow groundwater and deep groundwater in the lowland areas. Large‐scale As, F, or B contaminations found in groundwater are closely related to groundwater salinization, agricultural activity, and the exploration of geothermal water in the area. With respect to the risk of contamination, groundwater in the basin is spatially divided into the following: shallow groundwater with a high risk located in the north side of the Salt Lake, shallow groundwater with a moderate risk, and deep groundwater with a low to moderate risk. Nationally, the increasing demand on groundwater is threatened by a range of environmental and health pressures, including salinization and contaminations of nitrate, As, F, or B. Our study indicates that natural water‐rock interactions and hydrogeological conditions are significant factors controlling these contaminations. Systematic management and regulation of existing groundwater resources are required to prevent further deterioration of groundwater resources. Policies should be made and implemented to ensure “green” exploitation of geothermal water.

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Past changes to isotopic and solute balances in a continental playa: clues from stable isotopes of lacustrine carbonates

Cited by 40 publications

References 31 publications

Carbon isotope fractionation in synthetic magnesian calcite

Carbon isotope fractionation in synthetic magnesian calcite

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

Assessment of Groundwater Quality at Yuncheng Basin: Denotation for the Water Management in China

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