伊犁盆地南缘中侏罗统西山窑组价态铀特征
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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.
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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[2]焦养泉,李祯.河道储层砂体中隔挡层的成因与分布规律[J].石油勘探与开发,1995,22(4):78-81.
[3]焦养泉,李思田.碎屑岩储层物性非均质性的层次结构[J].石油与天然气地质,1998,19(2):89-92.
[4]焦养泉,李思田.陆相盆地露头储层地质建模研究与概念体系[J].石油实验地质,1998,20(4):346-353.
[5]穆龙新,贾文瑞,贾爱林.建立定量储层地质模型的新方法[J].石油勘探与开发,1994,21(4):82-86.
[6]裘亦楠,陈子琪.油藏描述[M].北京:石油工业出版社,1996.
[7]窦之林.储层流动单元研究[M].北京:石油工业出版社,2000.
[8]杜默,邱余波,陈文彬,等.伊犁盆地扎吉斯坦北部西山窑组下段砂体发育特征与铀成矿的关系[J].沉积于特提斯地质2014(1):55-60.
[9]权志高,李占双.新疆十红滩砂岩型铀矿床基本特征及成因分析[J].地质论评,2002(6):430-436.
[10]朱西养.层间氧化带砂岩型铀矿元素地球化学特征[D].成都:成都理工大学,2005.
[11]邱余波.伊犁盆地西南缘侏罗系沉积演化与砂岩型铀矿成矿作用[D].成都:成都理工大学,2015.