Isotopic and geochemical evolution of ground and river waters in a karst dominated geological setting: A case study from Lijiang basin, South-Asia monsoon region

Pu, Tao; He, Yuanqing; Zuyi, Tao; Wu, J.; Zhu, Guofeng; Chang, Li

doi:10.1016/j.apgeochem.2013.02.013

Cited by 48 publications

(59 citation statements)

References 53 publications

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“…Environmental isotopes, such as oxygen and hydrogen isotope, were usually used as a natural tracer to identify the origin of groundwater [1,2,11,40]. In this study, δD for groundwater varied from −67.0‰ to −52.5‰, with an average of −59.3‰.…”

Section: Deuterium and Oxygen Isotopesmentioning

confidence: 99%

“…Karst groundwater is recognized as an indispensable water resource for drinking and irrigated agriculture in those regions [1]. The hydrogeochemical evolution of groundwater is typically affected by natural factors including the composition of rain water, geological structure and mineralogy of aquifer, and water-rock interaction along the flow paths [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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Abstract:In this study, the major chemical compositions of 159 shallow groundwater samples incorporated saturation index (SI) and Principal Component Analysis (PCA) were employed to evaluate the mainly geochemical processes that control the hydrogeochemical evolution of groundwater in a typical karst area, Bijie city, Guizhou Province. The groundwater samples in this study area were dominated of HCO 3 -Ca, HCO 3 -Ca-Mg, and HCO 3 -SO 4 -Ca types. The PCA suggested that four principal components could explain 88.85% of the total variance of 10 parameters, indicating that the hydrogeochemical evolution of groundwater was mainly controlled by the dissolution/precipitation of carbonates, gypsum, and halite minerals, cation exchange, and anthropogenic activities. To be specific, the enrichment of Ca 2+ , Mg 2+ , HCO 3 − and SO 4 2− in groundwater were primarily affected by the dissolution of dolomite and gypsum minerals, and the role of calcite dissolution was relatively weaker because most groundwater samples were saturated with respect to calcite. Besides, cation exchange was another factor that may affect the concentration of Ca 2+ and Mg 2+ in groundwater, and the concentration of SO 4 2− can also be influenced by coal mining activity. In addition, the concentrations of Na + and Cl − in groundwater were likely influenced by the dissolution of halite, cation exchange, and human activities.

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Section: Deuterium and Oxygen Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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“…The weathering of carbonate rocks is a dynamic process and variations on timescales of hours are documented, as well as fast precipitation, mainly dependent on the concentration of CO 2 in the aqueous system (Calmels et al, 2014;Pu et al, 2013;Roland et al, 2013;Serrano-Ortiz et al, 2010). The fast calcite dissolution implies that equilibrium is easily reached with respect to a given pCO 2 (Dreybrodt et al, 1996;Reddy et al, 1981) without expecting fast calcite precipitation due CO 2 degassing in the spring water (Szramek and Walter, 2004).…”

Section: Introductionmentioning

confidence: 99%

Ecosystem controlled soil-rock pCO2 and carbonate weathering – Constraints by temperature and soil water content

et al. 2019

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A B S T R A C TCarbonate dissolution in soil-groundwater systems depends dominantly on pH, temperature and the saturation state of the solution with respect to abundant minerals. The pH of the solution is, in general, controlled by partial pressure of CO 2 (pCO 2 ) produced by ecosystem respiration, which is controlled by temperature and water availability. In order to better understand the control of land temperature on carbonate weathering, a database of published spring water hydrogeochemistry was built and analysed. Assuming that spring water is in equilibrium with the soil-water-rock-atmosphere, the soil pCO 2 can be back-calculated. Based on a database of spring water chemistry, the average soil-rock CO 2 was calculated by an inverse model framework and a strong relationship with temperature was observed. The identified relationship suggests a temperature control on carbonate weathering as a result of variations in soil-rock pCO 2 , which is itself controlled by ecosystem respiration processes. The findings are relevant for global scale analysis of carbonate weathering and carbon fluxes to the ocean, because concentration of weathering products from the soil-rock-system into the river system in humid, high temperature regions, are suggested to be larger than in low temperature regions. Furthermore, results suggest that, in specific spring samples, the hydrochemical evolution of rain water percolating through the soilrock complex can best be described by an open system with pCO 2 controlled by the ecosystem. Abundance of evaporites and pyrite sources influence significantly the chemistry of spring water and corrections must be taken into account in order to implement the inverse model framework presented in this study. Annual surface temperature and soil water content were identified as suitable variables to develop the parameterization of soil-rock pCO 2 , mechanistically consistent with soil respiration rate findings.

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“…This groundwater pH value is neutral to slightly alkaline in nature. Normally, the pH value follows this order of dominance: groundwater > river water > melt water > fresh water > rain water (Pu et al, 2013).…”

Section: General Chemistrymentioning

confidence: 99%

“…In many areas, excessive use of groundwater has induced problems such as contamination, ground subsidence, and depletion of groundwater. The hydrological and environmental impact may be the result of increasing human activities, and studying the evolution of groundwater helps us to better understand the water processes of this area (Pu et al, 2013). Furthermore, preservation and improvement of groundwater quality is important in securing renewable groundwater resources.…”

Section: Introductionmentioning

confidence: 99%

Chemical Characteristics of Groundwater in Carbonate Rock Areas of Korea

Kabir¹,

Park²,

Lee³

2014

Journal of Soil and Groundwater Environment

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This study was conducted to understand the chemical characteristics of groundwater in carbonate areas of Korea. In this study, data on pH, electric conductivity (EC), Ca , and HCO 3 − were collected from 97 wells which were installed in various carbonate rock regions of Korea. The pH values ranged from 5.7 to 9.9, and the average value was 7.3. The concentration range showed differences between the maximum value of HCO , and HCO 3 − might be not only water-rock interactions, but also irrigation return flow, because many groundwater wells had been developed for irrigation purposes. Subsequently, the influence of agriculture on groundwater chemistry was evaluated using a cumulative plot of SO 4 2− . The threshold value of SO 4 2− calculated from the cumulative frequency curve was 29.2 mg/L. Therefore, 12.4% of all the groundwater wells were affected by agricultural activity.

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Isotopic and geochemical evolution of ground and river waters in a karst dominated geological setting: A case study from Lijiang basin, South-Asia monsoon region

Cited by 48 publications

References 53 publications

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Ecosystem controlled soil-rock pCO2 and carbonate weathering – Constraints by temperature and soil water content

Chemical Characteristics of Groundwater in Carbonate Rock Areas of Korea

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