摘要
传统的层间氧化带砂岩型铀成矿理论认为,U^(6+)在沿渗透性砂岩层迁移的过程中,在氧化—还原界面附近被还原成U^(4+)而沉淀、富集成矿。而伊犁盆地南缘侏罗系西山窑组下段含矿岩石价态铀分析结果表明,在氧化砂体中U^(6+)含量并非完全高于U^(4+)含量,在铀离子发生沉淀、富集的成矿界面U^(4+)含量较高,但U^(6+)含量也处于较高水平,仅个别样品中出现了U^(6+)含量高于U^(4+)的现象,该现象的出现与成矿砂体岩性、地球化学环境中有机碳及地下水成分有较大联系。
According to the traditional inter-layer oxidation zone sandstone uranium metallogenic theory,in the migration process along the permeable sandstone layer,U6 + is reduced to U4 + and is pre-cipitated and concentrated mineralization in the oxidation-reduction interface.The valence uranium analy-sis of ore-bearing rock of Jurassic system Xishanyao formation hypomere of the southern margin of Ili basin show that the content of U6 + is not completely higher than the content of U4 + in the oxidation sand bodies,the content of U4 + is higher than others in the uranium precipitation and enrichment metallogenic interface,but the content of U6 + is not very low,the phenomenon of the content of U6 + is higher than U4 +is only appeared in individual sample of ore-bearing rock,the emergence of the phenomenon is related to the lithology of metallogenic sand bodies,the organic carbon and chemical constituents of groundwater in the geochemical environment.
出处
《现代矿业》
CAS
2016年第7期137-140,共4页
Modern Mining
基金
国家自然科学基金联合基金项目(编号:U1403292)
整装勘查关键基础地质研究计划项目(编号:12120114007601)
关键词
伊犁盆地
西山窑组
价态铀
成矿砂体
有机碳
Ili basin
Xiashanyao formation
Valence uranium
Metallogenic sand-body
Organic carbon
