柴达木盆地东北缘阿木内克山地区铀矿化特征及控矿因素分析  

Analysis of uranium mineralization characteristics and ore-controlling factor in Amuneke Mountain area in the northeast margin of Qaidam Basin

作　　者：陈擎 陈云杰 陈斌 张胜龙 邵恒博 李强 CHEN Qing;CHEN YunJie;CHEN Bin;ZHANG Shenglong;SHAO Hengbo;LI Qiang(Research Institute No.203 of Nuclear Industry,Xi’an 710000,Shaanxi,China)

机构地区：[1]核工业二○三研究所,陕西西安710000

出　　处：《矿产与地质》2023年第3期507-513,521,共8页Mineral Resources and Geology

基　　金：中国核工业地质局项目(编号:2022-19和202319-7);中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金(编号:2022NRE-LH-17)共同资助。

摘　　要：柴达木盆地北缘阿木内克山铀矿点铀矿化产在古元古界达肯大板群下岩组混合岩组中,赋矿岩性为云母石英片岩。铀矿化和碱交代蚀变岩的展布严格受F 3断裂的羽状次级断裂控制,并在空间上与伟晶岩、煌斑岩、闪长玢岩及安山玢等岩脉较密切,与铀矿化关系密切的碱交代蚀变主要有钠长石化、赤铁矿化、绿泥石化和碳酸盐化等。通过岩矿鉴定及电子探针等工作,在矿石中新发现了钛铀矿和铈铀钛铁矿等铀矿物,铀矿物呈自形—半自形细小板柱状晶形,集合体呈散染粒状、团块状,具有高UO_(2)及TiO_(2)、几乎不含ThO_(2)的特征。铀矿化受构造、岩性及热液蚀变的控制,地表铀异常点带较多,且已发现较好的铀矿体,区内热液型铀成矿潜力大。Uranium mineralization at Amuneke Mountain uranium spot in the north margin of Qaidam Basin occurs in the migmatite group of the lower rock group of the Paleoproterozoic Dakedaban Group.The host lithology is mica-quartz schist.The distribution of uranium mineralization and alkali metasomatic altered rock is strictly controlled by the feather secondary fracture of F3 fault,and is closely related to pegmatite,lamenite,diorite and andanite in space.The alkali metasomatic alteration closely related to uranium mineralization mainly includes albitization,hematitization,Chloritization and carbonization.New uranium minerals such as titanurite and cerium-uranite ilmenite are found in the ore through rock ore identification and electron probe.The uranium minerals are in the shape of euhedral to semi-euhedral fine plate columnar crystal,and the aggregate is in the shape of disseminated granular and lump,with high UO_(2)and TiO_(2)and almost no ThO_(2).Uranium mineralization is controlled by structure,lithology and hydrothermal alteration.There are many uranium anomaly zones on the surface,and good uranium orebodies have been found.There is a great potential of the hydrothermal uranium mineralization in this area.

关 键 词：碱交代 控矿因素 煌斑岩 铀矿化特征 柴达木盆地 

分 类 号：P619.14[天文地球—矿床学]