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Using correlation and multivariate statistical analysis to identify hydrogeochemical processes affecting the major ion chemistry of waters: a case study in Laoheba phosphorite mine in Sichuan, China

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Abstract

Prior to mining, the water in and around the mine is rarely influenced by human activities, and hydrogeochemical processes are the major factors influencing and controlling water chemistry. To identify these natural hydrogeochemical processes in Laoheba phosphorite mine (Sichuan Province, China), correlation and multivariate statistical techniques were used. Results show that water quality in the area is generally good before the Laoheba phosphorite mine goes into construction and production. The cluster analysis classified water samples into 4 clusters (C1–C4). Samples from C1 and C2 are of HCO3−Ca·Mg and HCO3−Ca type, while those from C3 and C4 are of HCO3−Ca·Mg type. Most parameters except Cl and pH show an increasing trend in the order of C1 to C4. Three principal components were extracted, and PC1 represents the ion exchange and the weathering of calcite, dolomite, and silicate minerals. PC2 and PC3 indicate the process of water recharge from upstream waters and the process of evaporation, respectively. The hydrochemistry of waters in the area is a result of multiple factors, and natural mineral weathering and ion exchange are the most important ones.

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Acknowledgments

The research was supported by the Doctor Postgraduate Technical Project of Chang'an University (2013G5290002 and CHD2011ZY022), the Special Fund for Basic Scientific Research of Central Colleges (CHD2011ZY020 and CHD2012TD003), and the National Natural Science Foundation of China (41172212). We are grateful to the editor and reviewers for their valuable comments. Engineer Xiang G was highly appreciated for providing the basic physiochemical and hydrogeological data of the study.

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Correspondence to Peiyue Li.

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Wu, J., Li, P., Qian, H. et al. Using correlation and multivariate statistical analysis to identify hydrogeochemical processes affecting the major ion chemistry of waters: a case study in Laoheba phosphorite mine in Sichuan, China. Arab J Geosci 7, 3973–3982 (2014). https://doi.org/10.1007/s12517-013-1057-4

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