Geochemical Characteristics and Controlling Factors of Chemical Composition of Groundwater in a Part of the Nanchang Section of Ganfu Plain

Qingshan Ma, Weiya Ge and Fujin Tian
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Qingshan Ma: Nanjing Center, China Geological Survey, Nanjing 210016, China
Weiya Ge: Nanjing Center, China Geological Survey, Nanjing 210016, China
Fujin Tian: Nanjing Center, China Geological Survey, Nanjing 210016, China

Sustainability, 2022, vol. 14, issue 13, 1-12

Abstract: This work aims to investigate the hydrochemical characteristics and formation mechanisms of shallow groundwater in a part of the Nanchang section of Ganfu plain. The hydrochemical data from 90 groundwater samples were interpreted by the methods of mathematical statistics, Piper diagrams, Gibbs plots, ratio graphs of ions, and geochemical modeling. The results show that shallow groundwater is weakly acidic, the average concentration of cation in groundwater decrease in Ca 2+ > Na + > Mg 2+ > K + , and the abundance is in the order HCO 3 − > NO 3 − > SO 4 2− > Cl − for anions. The hydrochemical type of groundwater was dominated by HCO 3 -Na·Ca·Mg, HCO 3 ·Cl-Na·Ca·Mg, and HCO 3 -Na·Ca. Moreover, the main controlling factor of groundwater hydrochemistry is water-rock interactions. Na + and K + mainly originate from the dissolution of halite. Ca 2+ and Mg 2+ are mainly controlled by carbonate dissolution, while the main anions come from the dissolution of evaporite and carbonate. The groundwater chemical evolution is affected by the dissolution and precipitation of the mineral phase and cation exchange.

Keywords: shallow groundwater; hydrogeochemical processes; geochemical modeling; Nanchang (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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