热液型铀矿穿透性地球化学勘查方法的微观证据  

Deep-penetrating geochemical microscopic evidence in the hydrothermal uranium deposit exploration

作　　者：王勇[1] 叶荣[2] 刘洪军[1] 吴国东[1] 王东升 

机构地区：[1]核工业北京地质研究院,北京100029 [2]中国地质大学,北京100083

出　　处：《世界核地质科学》2017年第3期167-173,共7页World Nuclear Geoscience

基　　金：中国核工业地质局铀矿地质科研项目(编号:201658);国家重点研发计划项目<火山岩型铀矿地球化学块体三维模型>(编号:2016YSC0600601-2)资助

摘　　要：隐伏热液型铀矿地气测量研究工作表明,以泡塑作为捕集介质的地气方法能够有效地显示出控矿构造上方的铀及其伴生元素地气异常。对矿体上方-400目土壤微粒样品及深部矿石微粒样品进行微观观测,发现了样品中含铀微颗粒。含铀颗粒粒径大小为600~700 nm,以单个或聚合态形式吸附于黏土矿物表面,与深部矿石中含铀微粒在组分特征上具有相似性。根据铀元素的地球化学特征,认为表层土壤含铀微粒是深部矿石微粒受深部营力作用垂向迁移,并经表生水化学作用的产物。该类含铀微颗粒的发现为穿透性地球化学铀矿勘查方法提供了直接的微观证据。The geogas method research on a blind hydrothermal uranium deposit shows that geogas anomaly of uranium and other mineral elements are very clear and effective upon the ore -controlling structures by using plastic foam as the capture media. Through the microscopic research using SEM -EDS, submicron uranium particles were discovered both in the ore-body and the surface soils upon the deposit. The size of the particles in soils is about 600 to 700 nm, and the particles were attracted on the surface of the clay minerals. Through comparing the contents of the two types of particles, a close relationship was found between the soils particles and the ore-body particles. According to the geochemical characters of uranium, it is reasonable that the uranium particles in soils are the products of the particles in the ore-body experienced vertical migration and hydrochemical action. The discovery of the submicron particles can provide a microscopic evidence for deep -penetrating geochemical method in uranium exploration.

关 键 词：热液型铀矿 穿透性地球化学 地气异常 亚微米级含U微粒 

分 类 号：P632[天文地球—地质矿产勘探]