摘要
通过野外观察以及室内的岩矿鉴定、X射线衍射、QEMSCAN及电子探针分析手段,对纳米比亚欢乐谷地区白岗岩型铀矿矿石的矿物组成及其结构构造进行了详细的研究。该地区铀矿物主要有晶质铀矿、沥青铀矿、钍铀矿、钛铀矿、铌钛铀矿、铀烧绿石、黑稀金矿、硅钙铀矿、铀石和铀钍石。晶质铀矿、钍铀矿和铀钛氧化物的结构多为全自形或半自形晶粒状结构、浸染状构造,而沥青铀矿和铀硅酸盐则大部分为隐晶结构、交代残余结构以及脉状、细脉状构造。由此可见,该地区白岗岩型铀矿是由原始岩浆的结晶分异作用、后期热液的叠加改造作用及表生氧化作用共同作用的产物。
Based on field observations, microscope, X-ray diffraction, QEMSCAN and electron microprobe tech niques, this paper studies in detail the mineral composition, texture and structure of uranium ore of the alaskitetype uranium deposit in the Gaudeanmus area, Namibia. Uranium minerals of this area are mainly uranium oxides, U-Ti-oxides and uranium silicates, in which, uranium oxides include uraninite, pitchblende and thor-uraninite; U Ti-oxides include brannerite, betafite, uranpyrochlore and euxenite; uranium silicates include uranophane, coffinite and uranothorite. Uraninite, thor-uraninite and U-Ti-oxides are mostly panidiomorphic or hypidiomorphic granular texture, disseminated structure, and most of pitchblende and uranium silicates are aphanocrystalline texture, meta somatic relict texture and veined structure. Thus, the alaskite-type uranium deposit of this area was formed together by the original magma crystallization differentiation, later hydrothermal reformation and supergenesis.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2014年第1期91-97,共7页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
非洲中南部古老地块铀矿综合识别评价技术及应用研究项目
关键词
铀矿物
结构构造
矿化成因
白岗岩型铀矿
纳米比亚欢乐谷地区
uranium minerals
texture and structure
genesis
alaskite-type uranium deposit
Gaudeanmus area, Namibia
