Geological and Geochemical Characteristics of Low-Arsenic Groundwater in The Karamay Area Between Two High Arsenic Areas of Xinjiang, China Qiao Li (
[email protected] ) Xinjiang Agricultural University https://orcid.org/0000-0002-1514-8572 Hongfei Tao Xinjiang Agricultural University Mahemujiang Aihemaiti Xinjiang Agricultural University Youwei Jiang Xinjiang Agricultural University Wenxin Yang Xinjiang Agricultural University Jun Jiang Xinjiang Agricultural University Research Article Keywords: Low arsenic groundwater area, Tectonic and sedimentary evolution, Groundwater geochemistry, Xinjiang, China Posted Date: May 10th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-498060/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Page 1/15 Abstract The groundwater of several regions in Xinjiang, China, including the Kuitun and the Manas River Basins in the Junggar Basin, is heavily polluted with arsenic. However, the arsenic content of the groundwater of the Karamay area located within the Junggar Basin is relatively low and below the recommended drinking water limit. In our study, we analyze the factors that result in this anomaly. The geological and geochemical characteristics of the water-bearing system in this area were investigated by analyzing water samples, carrying out hydrogeological surveys, and statistical techniques. Since the Carboniferous, the geological development and subsequent structural evolution resulted in a lower arsenic concentration in groundwater of the Karamay region than that of the Kuitun River Basin and the Manasi River Basin. The missing high-energy sedimentary environment in the Middle-Upper Permian and the composition of sediments controlled the characteristics of the multi-layer aquifer in this area.