| 李华明,李玲,方启春,吕川,魏欣,骆效能.黏砂岩型铀矿产铀层位中黏土矿物特征及其对铀矿化的意义:以鄂尔多斯盆地北部砂岩型铀矿为例[J].矿产勘查,2026,17(4):604-614 |
| 黏砂岩型铀矿产铀层位中黏土矿物特征及其对铀矿化的意义:以鄂尔多斯盆地北部砂岩型铀矿为例 |
| The characteristics of clay minerals in sandstone uranium deposits and its implication to uranium mineralization: A case of sandstone uranium deposits in northern Ordos Basin |
| 投稿时间：2024-08-05 |
| DOI：10.20008/j.kckc.202604003 |
| 中文关键词: 鄂尔多斯盆地 砂岩型铀矿床 黏土矿物 吸附铀 |
| 英文关键词: Ordos Basin sandstone uranium deposit clay minerals adsorbed uranium |
| 基金项目:本文受中国核工业地质局地勘费项目(202229)资助。 |
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| 中文摘要: |
| 本文通过对鄂尔多斯盆地北部铀成矿带产铀层位中侏罗统直罗组砂岩进行系统采样和分析，以探讨砂岩中黏土矿物特征与铀矿化成因之间的关系。采用电子探针化学成分分析和扫描电镜镜下观察等现代分析手段，对铀的赋存状态、铀矿物与黏土矿物的产出关系进行系统研究。结果表明:研究区铀的存在形式主要有吸附铀和铀矿物，其中以吸附铀为主，铀矿物则以铀石为主；蒙脱石与高岭石均表现为与铀含量较好的正相关性，绿泥石、伊利石与铀矿化相关性较差；矿化砂岩中大量的铀矿物与黏土矿物相伴生，这类铀是以吸附态产出的，黏土矿物通常以集合体形态附着在黏土矿物的表面或被黏土矿物所包裹；研究区存在黏土矿物与有机质形成的有机黏土复合体，该复合体在作为重要吸附介质的基础上，参与了铀的还原作用。本研究在一定意义上完善了研究区铀成矿理论，可为进一步的勘查工作提供一定的借鉴意义。 |
| 英文摘要: |
| In order to explore the characteristics of clay minerals in sandstone and its implication to uranium mineralization, we systematically sampled sandstones of the Middle Jurassic Zhiluo Formation in the uranium-producing horizon of the northern Ordos Basin. We analyzed the occurrence state of uranium and the characteristicsof clay minerals, the results show that uranium mainly exists in the form of adsorbed uranium, followed by uraniumminerals, and uranium minerals are mainly coffinite; montmorillonite and kaolinite show a clear positive correlationwith uranium content while chlorite and illite are poorly correlated with uranium mineralization, which indicatesthat montmorillonite and kaolinite play important roles in uranium mineralization in the study area. Our study sug.gest that uranium occurs mainly as adsorbed state in mineralized sandstones, attached to the surface of clay miner.als or are encapsulated by clay minerals in the form of aggregates. In addition, the organoclay complex formed byclay minerals and organic matter in the study area is an important uranium adsorption medium, and also participatesin the reduction of uranium. The research, to a certain extent, refines the uranium metallogenic theory in the studyarea and provides some reference significance for further exploration work. |
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