澳大利亚四英里砂岩型铀矿床流体成矿条件分析  

Fluid metallogenic conditions of Four Mile sandstone type uranium deposit in Australia

作　　者：余倩[1] 聂逢君[1] 林子瑜[1] 徐翅翔 YU Qian;NIE Fengjun;LIN Ziyu;XU Chixiang(East China University of Technology,Nanchang 330000,China)

机构地区：[1]东华理工大学,南昌330000

出　　处：《世界核地质科学》2020年第4期271-279,共9页World Nuclear Geoscience

基　　金：中国核工业地质局项目《铀资源大数据分析与找矿战略研究》(编号:201928-3)资助。

摘　　要：四英里铀矿床是南澳弗洛姆湖盆地最重要的可地浸砂岩型铀矿资源,已探明资源储量为32000 t,平均品位为0.33%,目前正在开发中。铀矿化赋存于下白垩统帕拉巴拉纳组和始新统艾尔组砂岩中,其西部北弗林德斯山脉画家山域富铀中元古代结晶基底及侵入其中的花岗岩,是形成弗洛姆地区砂岩型铀矿的矿质来源;矿床大部分铀矿化发生在有机质缺乏的砂体中,具有重要的控矿和成矿作用;导通深部油/煤盆地还原性流体的断裂构造和含铀氧化流体向盆地更深层部位迁移,这显示出“双流体”成矿模型的重要性,也意味着在一些“双流体”成矿地段,需要加大勘查深度。Four Mile uranium deposit is the most important in-situ leachable sandstone type uranium resource in Lake Frome Basin,South Australia.The measured resource reserve is 32000 t,with an average grade of 0.33%,which is currently under development.The uranium mineralization occurs in the low Cretaceous Parabarana Formation and Eocene Eyre Formation sandstone,and the uranium rich Mesoproterozoic crystalline basement and the intruded granite in the painter mountain area of the northern Flinders Ranges in the west are the source of the sandstone type uranium deposits in Frome area.Most of the uranium mineralization occur in the sand body lacking organic matter,which plays an important role in ore control and mineralization.The fracture structure conducts the reducing fluid in deep oil or coal basin and the migration of uranium bearing oxidation fluid to the deeper part of the basin,which suggests the importance of the“double fluid”metallogenic model and larger exploration depth in predicted area by“double fluid”metallogenic models.

关 键 词：四英里铀矿床 铀矿化特征 成矿模型 成矿条件 

分 类 号：P619.14[天文地球—矿床学]