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对于研究利用铅同位素法找矿的可能性来说,前寒武纪铀矿床是非常适宜的对象。一方面,铀矿石长期存在,保证了大量放射成因铅的聚集,另方面,成矿后矿床变化的地质史很复杂,因而在许多情况下导致了铅和铀未衰变部分的分离。本文探讨了在铀矿物、矿石和围岩中铅和铀的比值、放射成因铅的存在形式、放射成因铅晕圈的成因以及在寻找矿床和评价异常时利用铅同位素比值的可能性。
The Precambrian uranium deposit is a very suitable target for studying the possibility of prospecting using the lead isotope method. On the one hand, the long-term existence of uranium ore ensures the accumulation of a large amount of radiogenic lead. On the other hand, the geologic history of ore-forming changes after mineralization is complex and in many cases leads to the separation of undegraded parts of lead and uranium. This paper discusses the ratio of lead to uranium in uranium minerals, ores and surrounding rocks, the existence of radiogenic lead, the causes of lead-induced halo and the possibility of using lead isotope ratios in the search for deposits and evaluation of anomalies.