内蒙古红山子—广兴铀成矿亚带二叠系额里图组赋矿层的厘定及其找矿意义  

Determination of the Ore-forming Layer of the Permian Elitu Formation in the Hongshanzi-Guangxing Uranium Metallogenic Sub-belt and Its Prospecting Significance

作　　者：唐大伟 郭恒飞 牛子良 祝洪涛[1] 林天发 达朝元 TANG Da-wei;GUO Heng-fei;NIU Zi-liang;ZHU Hong-tao;LIN Tian-fa;DA Chao-yuan(No.243 Geological Party,CNNC,Chifeng 024000,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《东华理工大学学报（自然科学版）》2020年第4期355-363,共9页Journal of East China University of Technology(Natural Science)

基　　金：中国核工业地质局项目(202001)。

摘　　要：红山子—广兴铀成矿亚带的基底火山岩为安山岩—英安岩—流纹岩组合,目前探明了新的铀矿床和铀矿化点。但对该火山岩组合的地质时代证据不足,岩石地层归属也不明确。通过SHRIMP锆石U-Pb测年、岩石地层单位对比划分和铀矿化产出特征分析,结果显示南窝铺铀矿床赋矿围岩英安岩年龄为(268.1±2.5)Ma,与周边同一时期火山岩年龄一致,地质时代属早二叠世—中二叠世早期,岩石地层单归属为额里图组,是一个新的铀矿赋矿层位。今后铀矿勘查应额外关注二叠系额里图组火山岩层位,尤其是火山岩层与构造、晚侏罗世火山岩层的接触界面,以及与岩体内外接触带的部位,同时其作为中国东部晚古生代火山岩系中与火山岩有关的热液型铀矿,为热液型铀矿成矿理论研究打开了新的窗口。The basement volcanic rocks in the Hongshanzi-Guangxing uranium metallogenic sub-belt are an andesite-bronzeite-rhyolite assemblage,and in which has been discovered some new uranium deposits and uranium mineralization sites.However,there is insufficient evidence for the geological age of the volcanic assemblage,and the rock stratum is also unclear.Through SHRIMP zircon U-Pb dating,comparison of rock stratigraphic units,and analysis of uranium mineralization output characteristics,the results show that the age of the surrounding rocks in the Nanwopu uranium deposit is(268.1±2.5)Ma,which is the same as the sourrounding volcanic rocks.The geological age belongs to the Early Permian-early Middle Permian,and the rock stratigraphic unit belongs to the Elitu Formation,which is a new uranium deposit.Therefore,it should pay extra attention to the Permian Elitu Formation volcanic rock in uranium exploration,especially the contact interface between the volcanic rock and the structure and the Late Jurassic volcanic rock,as well as the location of the internal or external contact zone of rock bodies.As a hydrothermal ore-bearing stratum for uranium deposits related to volcanic rocks in the Late Paleozoic volcanic rocks in eastern China,it had opened a new window for the theoretical study about hydrothermal uranium mineralization.

关 键 词：额里图组 早二叠世—中二叠世早期 铀矿化 红山子—广兴铀成矿亚带 找矿意义 

分 类 号：P619.14[天文地球—矿床学]