Abstract
Observation and experimental analysis of soluble salt deposit along four profiles across the strata deposited in Nihewan paleolake basin enabled us to recognize the nature and evolution stages of the Nihewan paleolake and its significance in stratigraphical division and pa-leo-environmental reconstruction. The Nihewan paleolake was at least a weak-saline to semi-saline lake and represents an intracontinental lake in the semi-arid region. The lower member of sedimentary strata in the paleolake contains gypsum layer and gypsum lamellae. Soluble salt is mainly composed of SO 2-4 and Ca2+ ions, representing a trend of the paleolake evolving into a stage of sulfate lake. The upper member of the strata has predominantly Cl-, K+, and Na+ ions in soluble salt, indicating a starting development of the paleolake to chlorite lake, but no salt rock was deposited, indicating a drying trend of the area.
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Li, R., Qiao, J., Qiu, W. et al. Soluble salt deposit in the Nihewan beds and its environmental significance. Sci. China Ser. D-Earth Sci. 43, 464–479 (2000). https://doi.org/10.1007/BF02875308
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DOI: https://doi.org/10.1007/BF02875308