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,U~(6+) is reduced to U~(4+)and is precipitated and concentrated mineralization in the oxidation-reduction interface. The valence uranium analysis of ore-bearing rock of Jurassic system Xishanyao formation hypomere of the southern margin of Ili basin show that the content of U~(6+)is not completely higher than the content of U~(4+)in the oxidation sand bodies,the content of U~(4+)is higher than others in the uranium precipitation and enrichment metallogenic interface,but the content of U~(6+)is not very low,the phenomenon of the content of U~(6+)is higher than U~(4+)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.
引文
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