| 甘肃省龙首山芨岭铀矿床蚀变和地球化学分带性特征:以钻孔ZKJ29-3为例 |
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| 引用本文： | 赵如意,陈毓川,陈云杰,荣骁,王刚,李涛.甘肃省龙首山芨岭铀矿床蚀变和地球化学分带性特征:以钻孔ZKJ29-3为例[J].地球科学,2020,45(2):434-450. |
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| 作者姓名： | 赵如意 陈毓川 陈云杰 荣骁 王刚 李涛 |
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| 作者单位： | 1.东华理工大学, 核资源与环境国家重点实验室, 江西南昌 330013 |
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| 基金项目： | 中国核工业地质局项目201349中国核工业地质局项目201571中国地质调查局中国矿产地质与成矿规律综合集成和服务（矿产地质志）项目DD20160346中国地质调查局项目12120114014901中国地质调查局项目DD2016013622东华理工大学核资源与环境国家重点实验室自主基金项目Z1914 |
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| 摘 要： | 芨岭铀矿床是解析龙首山成矿带铀成矿作用的关键所在.通过地质编录、镜下观察、电子探针和地球化学特征研究，综合矿床与周边铀矿点的蚀变和地球化学特征，将热液作用分为成矿前、成矿早期、主成矿、后成矿和成矿后等5个阶段.自矿体中心向外（A→F）的6个蚀变带中Na2O、U含量递减，SiO2和Rb含量呈宽缓的"U"型，FeO和MgO在A和E带中形成双峰，而P2O5和HREE则在A和D带含量较高，TiO2、Fe2O3、CaO、MnO、CO2、Zr、V、Cs、REE等组分主要富集于B、C和D带.成矿流体是起源于岩浆演化晚期的再平衡岩浆水，富含Na+、U6+、CO32-.逆向沸腾是主要的成矿机制，pH和Eh的变化进一步促进了沥青铀矿的沉淀.以蚀变组合分带与铀矿化关系为指导，有望在龙首山成矿带中段落实一个大型铀矿基地.
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| 关 键 词： | 龙首山 芨岭 钠交代型铀矿 蚀变矿物组合 地球化学 含铀热液 资源潜力 |
| 收稿时间： | 2018-12-14 |
The Characteristics of Geochemistry and Alteration of the Jiling Uranium Deposit in the Longshou Mountains,Gausu Province: A Case Study from Drill ZKJ29-3 |
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| Abstract: | The Jiling Na-metasomatic uranium deposit is one of the most important deposits in the Longshou mountains ore belt, which is a key to the research on uranium mineralization in this area. Based on the logging data, microscope analysis, electronic probe and geochemical characteristics, we divide hydrothermal process into 5 stages including premetallogenic, early metallogenic, main metallogenic, post-metallogenic and after metallogenic stage. The alteration zones can be divided into zone A to zone F from the ore center to the alteration outer, and their geochemical characteristics are as follows:Na2O and U contents decreasing distinctly from zone A to zone F; SiO2 and Rb contents show a relieved "U" type; FeO and MgO contents show bimodal in zone A and zone E, while P2O5and HREEs contents are relatively higher in zone A and Zone D; TiO2, Fe2O3, CaO, MnO, CO2, Zr, V, Cs and REEs contents are distinctly higher in zones B, C and D. The ore forming hydrothermal solution is rebalanced magma water, which is rich in Na+, U6+ and CO32-. Pitchblende was downloaded from hydrothermal solution by fluid boiling for pressure releasing suddenly, and the changing of pH and Eh promoted the conversion from U6+ to U4+. It could be hoped for a large scale uranium base are to be found under the guidance of altered mineral assemblages diagram in deep prospecting and ore forecasting. |
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