Uranium (U) is formed by the interaction of groundwater in aquifer and the surrounding rocks. The area chosen for this study is a hard rock terrain of various lithology in South India, which releases U in groundwater and affect the groundwater quality. Hence, this study was conducted to understand the geochemistry and temporal variations of U in groundwater with respect to saturation state of minerals for different seasons namely Pre-monsoon (PRM), Northeast monsoon (NEM), Southwest monsoon (SWM) and Post-monsoon (POM). A total of 216 groundwater samples were collected, representing various lithology (Fissile hornblende biotite gneiss, Charnockite, Quartzite, Granite and Flood Plain Alluvium) in the study area. The collected samples were analyzed for physical parameters such as Electrical conductivity, Total dissolved solids, pH and major ions. U was measured using Laser Fluorimeter. The study infers that weathering in SWM, ion exchange in PRM and POM and anthropogenic process in NEM were the three major processes that could dominate the hydrogeochemistry of U. The higher concentration of U has been highlighted, and the water–rock interaction has been studied to know the sources of origin and it has been plotted through bivariate and ternary diagrams. The saturation index study was made and calculated for uranium, carbonate, sulfate, silicate and phosphate minerals using PHREEQC Programme. Uraninite and Coffinite are the dominant saturated states of U minerals which tend to attain near saturation to saturation state irrespective of seasons. With the increase in U concentration irrespective of seasons, it was noticed that the saturation state of minerals is also increasing. Overall, the weathering process and the lithological impact are the sources for higher concentration of U and their minerals occurring in the study area. The outcome of the study will help the policy makers for sustainable management to safeguard the groundwater resource in this region.

铀（U）由含水层中的地下水与周围岩石的相互作用形成。这项研究选择的区域是印度南部各种岩性的硬岩地形，其将U释放到地下水中并影响地下水质量。因此，本研究旨在了解不同季节（季风前（PRM），东北季风（NEM），西南季风（SWM）和后季风）下地下水中铀的地球化学和时间变化与矿物饱和状态的关系。 （POM）。在研究区总共收集了216个地下水样品，代表了各种岩性（易裂角闪石黑云母片麻岩，夏诺克岩，石英岩，花岗岩和泛洪冲积层）。分析收集的样品的物理参数，例如电导率，总溶解固体，pH和主要离子。使用激光荧光计测量U。该研究推断，SWM中的风化，PRM和POM中的离子交换以及NEM中的人为过程是可控制U的水文地球化学的三个主要过程。U的浓度较高已被突出显示，并且水与岩石之间的相互作用已得到研究。为了了解起源，它已通过二元和三元图绘制。使用PHREEQC Programme对铀，碳酸盐，硫酸盐，硅酸盐和磷酸盐矿物进行了饱和指数研究，并对其进行了计算。铀矿和Coffinite是U矿物的主要饱和状态，无论季节如何，它们都趋于达到接近饱和的饱和状态。随着U浓度的增加而与季节无关，注意到矿物质的饱和状态也在增加。全面的，风化过程和岩性影响是研究区内铀及其矿物质含量较高的来源。研究的结果将有助于可持续管理的政策制定者保护该地区的地下水资源。