中文摘要：

传统的层间氧化带砂岩型铀成矿理论认为,U6+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U4+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U6+含量并非完全高于U4+含量,在铀离子发生沉淀、富集的成矿界面U4+含量较高,但U6+含量也处于较高水平,仅个别样品中出现了U6+含量高于U4+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。

英文摘要：

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.