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松辽盆地北部龙虎泡地区铁钛氧化物与砂岩型铀矿化关系探讨
A study of the relationship between the Fe-Ti oxide and sandstone-hosted uranium mineralization in Longhupao area, northern Songliao Basin
投稿时间:2018-09-04  
中文关键词:松辽盆地北部  龙虎泡  铁钛氧化物  钛铁矿  砂岩型铀矿化
英文关键词:northern Songliao Basin  Longhupao  Fe-Ti oxide  ilmenite  sandstone-hosted uranium mineralization
基金项目:国家重点基础研究计划("973计划")(2015CB453006);国家重点研发计划(2018YFC0604206);中国地质调查局地质调查项目(DD20190121)
作者单位
魏佳林 中国地质调查局天津地质调查中心, 天津 300170
中国地质调查局铀等能源地质重点实验室, 天津 300170 
汤超 中国地质调查局天津地质调查中心, 天津 300170 
金若时 中国地质调查局天津地质调查中心, 天津 300170
中国地质调查局铀等能源地质重点实验室, 天津 300170 
陈路路 中国地质调查局天津地质调查中心, 天津 300170 
郭虎 中国地质调查局天津地质调查中心, 天津 300170
中国地质调查局铀等能源地质重点实验室, 天津 300170 
徐增连 中国地质调查局天津地质调查中心, 天津 300170 
李建国 中国地质调查局天津地质调查中心, 天津 300170 
谷社峰 大庆油田有限责任公司勘探开发研究院, 黑龙江 大庆 163712 
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中文摘要:
      龙虎泡铀矿化区的发现是近年来根据油田资料二次开发和钻探验证而取得的重要创新成果之一,矿化区位于松辽盆地北部龙虎泡-大安阶地北,西与泰康隆起区和西部超覆区相邻。本文在详实的野外工作基础之上,利用偏光显微镜、电子显微镜、能谱、背散射、点化学分析及元素面扫描分析等手段,对龙虎泡地区含铀砂岩中以钛铁矿及其相关蚀变矿物为代表的铁钛氧化物与砂岩型铀矿化之间的关系进行了研究探讨,结果表明:①以富铀-铁钛氧化物-钛氧化物-黄铁矿为代表的蚀变矿物共生组合记录和保留了有关砂岩型铀矿成矿流体和成矿环境的重要信息,含矿砂岩中钛铁矿及其蚀变相关的富铀-铁钛氧化物、钛氧化物、黄铁矿等矿物的不同产出类型和不同蚀变矿物共生组合关系对比分析指示,龙虎泡地区铀成矿受到了后期含铀富铁的氧化性流体与富H2S的还原性流体混合作用影响,成矿环境偏强还原;②与铀矿化关系最为密切的铁钛氧化物是蚀变程度高且富镁的钛铁矿,富铀-铁钛氧化物即是这些强蚀变钛铁矿与后期成矿流体发生氧化还原作用形成的,钛铁矿内部溶蚀裂隙为含矿流体的蚀变和铀的沉淀富集提供了良好的容矿空间,蚀变钛铁矿和黄铁矿为铀的沉淀富集分别提供了良好的矿物尺度上的氧化障和还原障,在含矿流体与富H2S还原性流体混合过程中,铀得以在蚀变钛铁矿与黄铁矿的氧化还原界面附近沉淀富集。
英文摘要:
      The Longhupao uranium mineralization area, which is located in the north of Longhupao-Da'an terrace and adjacent to Taikang uplift and Western overlap in the west, is one of the important new achievements in northern Songliao Basin based on the secondary development and drilling verification of Daqing Oilfield wells. Based on detailed field work and using experimental means such as polarizing microscope, electron probe energy spectrum, backscattering, chemical analysis and distribution analysis of elements, the authors aimed to explore the relation-ship between the Fe-Ti oxides represented by ilmenite and sandstone-hosted uranium mineralization in Longhupao area. The study shows that the assemblage of altered minerals represented by U-rich Fe-Ti oxide-titanium oxide-pyrite has recorded the important information about ore-forming fluid and metallogenic environment in the process of sandstone-hosted uranium mineralization. The comparative analysis of different occurrences and assemblages for ilmenites and other altered minerals as U-rich Fe-Ti oxide, titanium oxide and pyrite reveals that the uranium mineralization in the Longhupao area was affected by the later oxidative fluid including U/Fe and the reductive fluid including H2S, and the metallogenic environment was strongly reductive. These strongly altered and Mg-rich ilmenites were closely related to the uranium mineralization, and the U-rich Fe-Ti oxides were formed in the redox reaction between these altered ilmenites and the later ore-bearing fluid. The corrosion fissures in these altered ilmenites provided favorable space for further alteration by ore-bearing fluid and uranium precipitation. The altered ilmenite offered a profitable mineral-scale oxidation barrier, and the pyrite offered a reduction barrier for uranium precipitation. During the fluid mixing of ore-forming and H2S-rich fluid, the uranium precipitated near the interface of reduction oxidation between altered ilmenites and pyrites.
魏佳林,汤超,金若时,陈路路,郭虎,徐增连,李建国,谷社峰,2019,松辽盆地北部龙虎泡地区铁钛氧化物与砂岩型铀矿化关系探讨[J].岩石矿物学杂志,38(3):375~389.
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