Hydrochemical Characteristics and Formation Mechanism of Shallow Brine in the Gongnan Depression of Chahansilatu Basin

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Key Points

The aim is to systematically analyze the hydrochemical characteristics and formation mechanisms of shallow brine in the Gongnan depression.
Conducted systematic testing and analysis of major and trace elements in shallow brine.
Measured total dissolved solids (TDS) and major ion compositions in the brine.
Utilized Piper diagrams for classification of brine characteristics.
TDS values ranged from 277.86 to 337.45 g/L, indicating significant evaporation concentration.
The shallow brine predominantly contains Na+ and Cl-, characterized as Na-Cl type on Piper diagrams.
Average potassium content was found to be 6.65 g/L, significantly higher than industrial extraction requirements.
Trace elements B and Li were measured at lower levels than industrial grades.

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Research uncovers hydrochemical traits and formation mechanisms of shallow brine, indicating vital potassium resources in a specific basin.

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BAI et al. (2026) studied this question.

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