中国铀、钍、钾元素地球化学场特征及与铀矿化关系

一直以来,利用铀、钍、钾同位素的γ能谱寻找铀矿是铀矿地质重要的放射性物探手段。同样,水系沉积物化探中铀、钍、钾元素作为铀矿化探重要指示元素,在铀矿资源潜力预测评价中亦发挥了重要作用。笔者论述了水系沉积物铀、钍、钾元素在铀矿预测评价中的指示作用和异常特点,以及中国铀、钍、钾元素地球化学场分布特点和规律,将铀、钍、钾异常按累频占比划分为特高异常(异常内带)、高异常(异常中带)、异常(异常外带)和高背景,同时,论证了铀、钍、钾异常分布与铀成矿关系。可以看出,铀、钍、钾异常分布有明显的区域特征,现有的异常分布区与我国四大类型铀矿产区高度一致,其异常分布对我国铀、钍矿资源预测评价具有重要意义。

GEOCHEMICAL CHARACTERISTICS OF URANIUM,THORIUM AND POTASSIUM ANOMALIES IN CHINA IN RELATION TO URANIUM MINERALIZATIONB

The utilization of uranium, thorium, potassium isotope gamma spectra for uranium prospecting is an important means of radi-oactive exploration. Similarly, uranium, thorium, potassium elements in stream sediments can serve as important indicator elements for uranium geochemical prospecting and have played important roles in the evaluation of China＆#39;s uranium resource potential. This paper discusses the effect and anomaly characteristics of uranium, thorium, potassium elements in stream sediments, and expounds geochemi-cal distribution characteristics and regularity of China＆#39;s uranium, thorium, potassium elements. According to percentages of strokes, the anomalies of these elements can be divided into ultra-high anomaly （abnormal inner zone）, high anomaly （abnormal mesozone）, a-nomaly （abnormal outer zone） and high background. the relationship between the distribution of uranium, thorium, potassium anoma-lies and uranium mineralization is also demonstrated in this paper. As can be seen, the distribution of uranium, thorium, potassium a-nomalies has obvious regional characteristics, the existing anomaly area are highly consistent with four major types of uranium mineral areas in China, and hence the anomaly distribution has great significance for the prediction and evaluation of uranium and thorium min-eral resources.