摘要
2081铀矿床的矿石以接触式胶结为主，其次为孔隙式胶结，胶结物主要为水云母，其次为方解石、黄铁矿、针铁矿、褐铁矿等。矿石中粘土矿物主要为蒙脱石，平均含量为73．3％，其次为高岭石和伊利石，无伊利石／蒙脱石混层。铀矿物主要是铀石，UO2含量为46．72％～73．4％，其次为钛铀矿，U02含量为36．01％～49.01％。铀石大多与黄铁矿伴生，有时与硒铅矿、锐钛矿等伴生，这些伴生矿物都不同程度地含铀。铀主要以吸附态形式存在，在矿床的不同部位，吸附态铀以及U^＋6、U^＋4占的比例存在较大差别，这是由于矿石处于不同的地球化学环境造成的。该铀矿床的形成与烃类具有密切关系。
The No. 2801 sandstone-type uranium deposit is located in the Dongsheng area in the north of the Ordos Basin. Uranium ores are characterized by contact cementation principally and then pore cementation. Cementing materials are hydromicas chiefly, followed by calcite, pyrite, goethite, hydroferrite, etc. Clay minerals from the ores are dominated by montmorillonite, accounting for 73.3 %, kaolinite and illite. There is no illite-montmorillonite layer in the ores. Uranium from the ores includes adsorptive uranium and uranium minerals. Uranium minerals are coffinite with UO2 46.72%- 73.4% and bmnnerite with UO2 36.01%-49.01%. The coffinite is usually associated with pyrite and sometimes with elausthalite and anatase, and such associated minerals contain uranium. As ores in different parts of the uranium deposit possess different oxidizing-reducing conditions, the contents of adsorptive uranium, U^6＋ , and U^4＋ are different. In addition, there is a close connection between the formation of the uranium deposit and oil/gas migration.
出处
《矿物学报》
CAS
CSCD
北大核心
2006年第3期349-355,共7页
Acta Mineralogica Sinica
基金
核工业地质局项目
关键词
砂岩型铀矿床
成矿特征
鄂尔多斯盆地
sandstone-type uranium deposit
metallogenetie characteristics
Dongsheng
Ordos Basin
