鄂尔多斯盆地砂岩型铀矿床中铀矿物赋存空间微观分析  

Microanalysis of the occurrence spaces of uranium minerals in sandstone-type uranium deposits in the Ordos Basin

作　　者：张字龙[1,2] 贺锋 于阿朋[1,2] 邱林飞 丁波[1,2] 骆效能 张艳[1,2] ZHANG Zi-long;HE Feng;YU A-peng;QIU Lin-fei;DING Bo;LUO Xiao-neng;ZHANG Yan(Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《矿物学报》2022年第6期815-824,共10页Acta Mineralogica Sinica

基　　金：中国铀业基础地质项目(编号:202118);中国铀业地勘项目(编号:202201-8);中核集团集中研发项目(编号:中核科发2021-143号);中核集团“青年英才”科研项目(编号:地QNYC2103)。

摘　　要：本文通过镜下观察了鄂尔多斯盆地多个砂岩型铀矿床中铀矿物及其赋存空间特征。研究发现,铀矿物通常赋存在碎屑颗粒间孔隙、矿物颗粒表面、碎屑或矿物微裂隙中,铀矿物的赋存空间与碎屑颗粒或矿物种类没有必然联系,而与矿物表面微型坑、洞、孔、缝隙或颗粒间孔隙关系密切,晶型完好的矿物表面一般无铀矿物。被粘土和炭屑等物质通过吸附作用(物理吸附作用或化学吸附作用)吸附在其表面的铀,部分为晶型稳定的铀矿物,即吸附作用形成的铀并非都是吸附态铀,有相当部分为独立铀矿物。现代镜下分析技术可以清晰观察微米级和纳米级铀矿物及其伴生矿物特征,能更细致地研究铀的存在形式和铀成矿作用。In this paper,the characteristics of uranium minerals and their occurrence spaces in ores of several sandstone-type uranium deposits in the Ordos Basin have been observed under microscope.It is found that uranium minerals occurred usually in intergranular pores of detritus,mineral particle surface,microcracks of clasts or minerals.The occurrence spaces of uranium minerals are not necessarily related to clastic particles or mineral types,but closely related to micro-sized pits,holes,pores,crevices on the mineral surface or intergranular pores of clastic particles.Generally,there is no uranium mineral on the mineral surface with intact crystal form.The uranium is generally adsorbed on the mineral surface by clay,carbon chips and other minerals through adsorption(physical adsorption or chemical adsorption),but a part of uranium occurred as crystal stable uranium minerals.Thus,the adsorbed uranium is not all the uranium of adsorption state,are a considerable part of uranium occurred as independent uranium minerals.Using the modern microscopic analytical technology,the characteristics of micron and nano scaled uranium minerals and their associated minerals can be clearly observed,and the existence form of uranium and the uranium mineralization can be also researched more carefully.

关 键 词：铀矿物 微型空间 铀成矿作用 吸附作用 成矿机理 

分 类 号：P579[天文地球—矿物学] P619.14[天文地球—地质学]