澳大利亚鳄鱼河谷铀矿集区主要铀矿床地质特征及成因  

Geological characteristics and genesis of main uranium deposits in Alligator River uranium district,Australia

作　　者：张闯[1] 郝瑞祥[1] 

机构地区：[1]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《世界核地质科学》2015年第2期68-74,共7页World Nuclear Geoscience

摘　　要：澳大利亚北部Kombolgie盆地西侧鳄鱼河谷地区，产出多个世界级不整合面型铀矿床。Jabiluka、Nabarlek和Ranger铀矿床多受构造控制，矿体产于断裂之中或其两侧，赋矿围岩为古元古界角闪岩相高级变质岩。铀矿物以晶质铀矿、沥青铀矿为主，伴生绿泥石化、绢云母化和赤铁矿化蚀变。Jabiluka、Nabarlek和Ranger铀矿床主成矿作用发生于1680～1640Ma，叠加3次后期矿化，时间分别为1360Ma、1100Ma和900Ma。矿床成矿流体为氧逸度较高的盆地流体，成矿物质可能来源于盆地中含铀碎屑或是盆地基底中含铀矿物。In Alligator River uranium district, western of Kombolgie basin, there are several worldclass unconformity-type uranium deposits. Jabiluka, Nabarlek and Ranger uranium deposits were controlled by faults, mainly hosted by Paleoproterozoic amphibolites-facies metamorphic rocks. The uranium minerals are mainly uraninite, pitchblende and associated with chlorite, sericite and hematite. The main mineralization of Jabiluka, Nabarlek and Ranger uranium deposits occurred in 1 680-1 640 Ma, and superimposed by three later mineralization stages which occurred in 1 360 Ma, 1 100 Ma, 900 Ma, respectively. The ore-forming fluid is mainly basinal fluid, and the metallogenic material is probably from uranium-bearing basinal clastics or minerals in metamorphic basement.

关 键 词：Kombolgie盆地 鳄鱼河谷铀矿集区 不整合面型铀矿床 Jabiluka铀矿床 Nabarlek铀矿床 Ranger铀矿床 

分 类 号：P619.14[天文地球—矿床学] P61[天文地球—地质学]