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选择穿透能力较大的土壤天然热释光测量和氡气测量两种方法各测量了236个物理点,研究其在花岗岩地区铀矿找矿中的应用效果。研究结果表明:1.在有构造破碎带通过的地方,氡气浓度相对偏高,所以用氡气测量来寻找含矿构造效果比较好。2.土壤天然热释光方法属于累积测量的范畴,它能比较明显地反应“交点型”铀矿体在地面的投影位置。3.土壤天然热释光法的灵敏度、稳定性和重现性好,它受地表人文活动的影响较小。它的异常跳变能反映放射性场的变化规律,因此它的异常跳变基本上能反映矿体的分布情况。今后需进一步解决的问题:两种方法的找矿深度多深?需整理并总结出一套在花岗岩型铀矿床上核地球物理找矿模式,以便指导今后在花岗岩中寻找铀矿床的工作。
In this paper, 236 physical points were measured by natural thermoluminescence and radon measurement, respectively, to study their application effect in prospecting for uranium deposit in granite area. The results show that: (1) Radon concentration is relatively high in the place where the structural crushing zone passes, so it is better to use radon gas to find the ore-bearing structure. 2. Soil natural thermoluminescence method belongs to the category of cumulative measurement, which can more clearly reflect the “intersection” type uranium ore body in the ground projection position. Soil natural thermoluminescence sensitivity, stability and reproducibility is good, it is less affected by human activities on the surface of the earth. Its anomalous jump can reflect the variation of radioactive field, so its abnormal jump basically reflects the distribution of ore body. Further questions to be solved in the future: How deep is the prospecting depth of the two methods? A set of nuclear geophysical prospecting patterns on the granite-type uranium deposits should be collated and summarized so as to guide the future work of finding uranium deposits in the granite.