伊犁盆地南缘铀水文地球化学特征及地下水铀成矿作用
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摘要
结合伊犁盆地南缘相关地质工作成果,首先对该区地质背景及水文地质条件进行了详细分析;然后运用统计学理论,以对数正态分布图解析的方式确定了水铀含量背景值及异常下限,结合样品水质分析、氧化还原电位Eh等成果,对该区进行了水化学分带,共分为HCO_3-Ca·Na型水带、HCO_3·SO_4-Ca·Na和SO_4·HCO_3-Ca·Na型水带、SO_4·Cl-Ca·Na和Cl·SO_4-Ca·Na型水带,并讨论了各水带的水文地球化学特征;最后分析了地下水铀铀源,通过热力学计算等方法,对水中铀的存在形式及铀的溶解、迁移和沉淀富集过程进行了详细阐述,总结分析了区内铀成矿水文地质条件,阐明了盆地水化学环境及铀水文地球化学环境。分析结果对于该区进一步开展铀矿找矿勘探工作有一定的参考价值。
Combing with some related geological results of the south margin of Yili basin,firstly,the geological background and hydrogeological conditions of the area are analyzed in detail; then,based on statistical theory,the background values and anomaly lower thresholds of the water uranium by using the logarithmic normal distribution plot analytical method,combing with the water quality analysis of samples,redox potential Eh and other results,the hydrochemical zoning of the south margin of Yili basin is conducted,so,the area is divided into HCO_3-Ca·Na type water bank,HCO_3·SO_4-Ca·Na and SO_4·HCO_3-Ca·Na type water bank,SO_4·Cl-Ca·Na and Cl·SO_4-Ca·Na type water bank,and the hydrogeochemical characteristics of the water banks are analyzed; finally,the uranium source of the groundwater uranium is discussed,based on thermodynamic calculation method,the existence form of water uranium and the process of dissolution,migration and precipitation and enrichment of water uranium are studied in depth,besides that,hydrogeological conditions of uranium metallogenic in the south margin of Yili basin is summarized,and water-chemical environment and uranium hydrogeochemical environment of Yili basin are analyzed. The above analysis results related to the uranium hydrogeochemical characteristics and groundwater uranium mineralization of the south margin of Yili basin can provide some reference for the further geological prospecting of uranium deposits in the area.
Combing with some related geological results of the south margin of Yili basin,firstly,the geological background and hydrogeological conditions of the area are analyzed in detail; then,based on statistical theory,the background values and anomaly lower thresholds of the water uranium by using the logarithmic normal distribution plot analytical method,combing with the water quality analysis of samples,redox potential Eh and other results,the hydrochemical zoning of the south margin of Yili basin is conducted,so,the area is divided into HCO_3-Ca·Na type water bank,HCO_3·SO_4-Ca·Na and SO_4·HCO_3-Ca·Na type water bank,SO_4·Cl-Ca·Na and Cl·SO_4-Ca·Na type water bank,and the hydrogeochemical characteristics of the water banks are analyzed; finally,the uranium source of the groundwater uranium is discussed,based on thermodynamic calculation method,the existence form of water uranium and the process of dissolution,migration and precipitation and enrichment of water uranium are studied in depth,besides that,hydrogeological conditions of uranium metallogenic in the south margin of Yili basin is summarized,and water-chemical environment and uranium hydrogeochemical environment of Yili basin are analyzed. The above analysis results related to the uranium hydrogeochemical characteristics and groundwater uranium mineralization of the south margin of Yili basin can provide some reference for the further geological prospecting of uranium deposits in the area.
引文
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