放射性元素含量关系在川北砂岩型铀矿勘查中的作用

THE SIGNIFICANCE OF RADIOACTIVE ELEMENT CONTENT RELATIONSHIP FOR THE EXPLORATION OF SANDSTONE URANIUM DEPOSITS IN NORTHERN SICHUAN

本文论述用高灵敏度、高稳定性微机化伽玛能谱仪,在现场快速测定岩石中的铀、钍、钾含量及其比值。利用含量及其比值关系,结合地球化学观点,确定铀富集的有利与不利条件,划分矿化的有利层位或岩段,分析地下水对铀成矿的叠加作用,说明铀矿床的后生改造成因。

This paper deals with a rapid and on-the-spot determination of uranium,thorium,potas-sium concentrations and ratios of U/Th and K/Th by using high sensitive,high stable tom-puterized gamma-ray spectrometer in a known area of northern Sichuan. Favourable and un-favourable conditions for uranium concentration have been determined and favourable forma-tions or lithological members have been divided by means of the relationship between element contents and their ratios. Uranium deposits of epigenetic reworking in origin have been ex-plained by analyzing the effect of groundwater on the superimposition of uranium etallogen-esiS。