富大陆相火山岩型铀矿床的成矿模式

METALLOGENIC MODEL FOR CONTINENTAL VOLCANIC-TYPE RICH AND LARGE URANIUM DEPOSITS

本文在剖析国内外富大（超大）陆相火山岩型铀矿床产出特征、成矿机理的基础上，建立了富大陆相火山岩型铀矿床的成矿模式：富铀的花岗岩或花岗岩化基底是该类型矿床形成的基础；成矿前多旋回、多阶段的火山喷发是矿床形成的前提；强烈伸展拉张的构造环境是矿床形成的关键[1]；成矿后相对圈闭的地质环境是可靠的保矿条件。作者应用这一模式解释了国内外一些富大铀矿床（俄罗斯斯特列措夫超大型铀矿床、蒙古多尔诺特超大型铀矿床、澳大利亚奥林匹克坝Cu－U－AU－REE超大型矿床及中国460和邹家山富大铀矿床）的产出规律，并与661大型贫矿床进行了对比。

A metallogenic model for continental volcanic-type rich and large/superlarge uranium deposits has been established on the basis of analysis of occurrence features and ore-forming mechanism of some continental volcanic-type rich and large/superlarge uranium deposits in the world.The model proposes that uranium-enriched granite or granitized basement is the fundation,premetallogenic polycyclic and multistage volcanic eruptions are prerequisites,intense tectonicextensional environment is the key for the ore formation,and relatively enclosed geologic setting is the reliable protection condition of the deposit. By using the model the author explains the occurrence regularities of some rich and large/superlarge uranium deposits such as Strelichof uranium deposit in Russia, Dornot uranium deposit in Mongolia, Olympic Dam Cu-U-An-REE deposit in Australia, uranium deposit No. 460 and Zhoujiashan uranium deposit in China,and then compares the above deposits with a large poor uranium deposit No. 661 as well.