| 新疆伊犁盆地砂岩型铀矿床层间氧化带中粘土矿物特征及与铀矿化关系研究 |
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| 引用本文： | 宋昊,倪师军,侯明才,张成江,时志强,王果,杨斌,胡媛,陈月娇.新疆伊犁盆地砂岩型铀矿床层间氧化带中粘土矿物特征及与铀矿化关系研究[J].地质学报,2016,90(12):3352-3366. |
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| 作者姓名： | 宋昊 倪师军 侯明才 张成江 时志强 王果 杨斌 胡媛 陈月娇 |
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| 作者单位： | 1) 成都理工大学，成都,610059；2） 地学核技术四川省重点实验室，成都,610059,1) 成都理工大学，成都,610059；2） 地学核技术四川省重点实验室，成都,610059,成都理工大学，成都,610059,1) 成都理工大学，成都,610059；2） 地学核技术四川省重点实验室，成都,610059,成都理工大学，成都,610059,核工业二一六大队，乌鲁木齐,830000,成都理工大学，成都,610059,成都理工大学，成都,610059,成都理工大学，成都,610059 |
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| 摘 要： | 新疆伊犁盆地砂岩型铀矿床,由于规模大、成矿环境和成矿条件好,在同类型矿床中具有良好的代表性,研究矿床的成矿作用对今后找矿勘查以及开采具有重要理论意义。本文在区域赋铀层位沉积环境研究基础上,以赋矿围岩为研究主体,对伊犁盆地典型铀矿床沉积序列和矿床的控矿层位开展研究,通过对赋矿沉积层位中粘土质对铀矿成矿的控制作用及与铀矿的空间联系和成因分析,开展系统的铀矿床学、能谱测试、显微结构、扫描电镜、地球化学、氢氧同位素等研究,特别是开展了富矿砂体中粘土矿物的种类、成分、结构、同位素、成因等的研究,对粘土质矿物对铀矿成矿的控制作用进行了系统研究。通过研究粘土矿物在伊犁盆地蒙其古尔砂岩型铀矿床成矿过程中的作用及与铀矿的空间联系和成因分析表明:粘土矿物在层间氧化带中分布较为广泛,在主要矿体的氧化还原过渡带中,尤其是部分具有强烈粘土蚀变的砂岩层中铀含量较其他层位要高,反映出粘土矿物与铀成矿是有成因关联的。通过系统的扫描电镜、能谱测试研究,从微观证明粘土矿物与铀成矿有相关关系;粘土矿物的存在导致在近地表含氧含铀水在经过砂岩孔隙时被具有较强吸附能力和巨大表面自由能的粘土矿物所吸附,形成了铀含量较高的片状,团块状的粘土矿物,其在铀成矿作用中起到了吸附和界面的作用,有利于赋矿空间的形成及定位。结合沉积作用、构造活动和后期流体成矿作用等因素,分析了成矿机制和成矿作用,赋矿层位中的粘土矿物、其它成矿条件如岩性(赋矿层和矿源层)、构造(对铀矿化的动力和对地下水径流及铀矿体)等共同控制了铀成矿作用。
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| 关 键 词： | 砂岩型铀矿 蒙其古尔 粘土矿物 铀成矿作用 伊犁盆地 新疆 |
| 收稿时间： | 2016/12/15 0:00:00 |
| 修稿时间： | 2016/12/15 0:00:00 |
The Characteristic of Clay Minerals in Sandstone type Uranium Deposit in the Yili Basin, NW China and Its Relationship With Uranium Mineralization |
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| SONG Hao,NI Shijun,HOU Mingcai,ZHANG Chengjiang,SHI Zhiqiang,WANG Guo,YANG Bin,HU Yuan and CHEN Yuejiao.The Characteristic of Clay Minerals in Sandstone type Uranium Deposit in the Yili Basin, NW China and Its Relationship With Uranium Mineralization[J].Acta Geologica Sinica,2016,90(12):3352-3366. |
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| Authors: | SONG Hao NI Shijun HOU Mingcai ZHANG Chengjiang SHI Zhiqiang WANG Guo YANG Bin HU Yuan and CHEN Yuejiao |
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| Abstract: | Due to its large scale, favorablemetallogenic setting and condition sandstone hosted uranium deposit in the Yili Basin in Xinjiang is representative of uranium deposits of this kind. Study of mineralization is of great significance for future exploration and mining. Based on field investigation on sedimentary environment of regional U bearing strata, with focus on ore bearing country rocks, sedimentary sequence of typical sandstone type uranium deposits in the Yili basin and ore controlling sequences were analyzed to understand the constraint of clay minerals on uranium mineralization and spatial distribution of uranium mineralization. Systematic study was conducted to analyze clay minerals in ore rich sandstone and their constraint on uranium mineralization using uranium geology, energy spectrometer, microscopic structure, scanning electron microscope, geochemistry, and H and O isotope. The results show that clay minerals are distributed widely within oxidation zone and redox zone of main orebodies, especially in strongly altered sandstone, all of which contain higher uranium contents than other sequence, reflecting an internal relation between clay minerals and uranium mineralization. Their relation can be further proved by SEM and energy spectrometer analysis. O and U bearing fluids passing through sandstone can be absorbed by clay minerals with strong absorption capability and huge surface free energy, forming flake or clumpy clay minerals which contain high U content.Therefore, clay minerals play absorption role in uranium mineralization, facilitating the formation and positioning of ore bearing space. Along with sedimentation, tectonic activities and late stage fluid mineralization, clay minerals and other ore forming lithology (ore bearing sequence and sources) and structure all controlled uranium mineralization in this area. |
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| Keywords: | Sandstone hosted uranium deposit Mengqigur clay mineral uranium mineralization Yili Basin Xijiang |
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