| 甘肃省龙首山芨岭钠交代型铀矿床地质特征与成因 |
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| 引用本文： | 赵如意,陈毓川,陈云杰,王刚,聂利,荣骁,李涛.甘肃省龙首山芨岭钠交代型铀矿床地质特征与成因[J].地球科学,2020,45(1):90-107. |
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| 作者姓名： | 赵如意 陈毓川 陈云杰 王刚 聂利 荣骁 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： | 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 |
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| 摘 要： | 芨岭钠交代型铀矿床是中国西北部的重要铀矿床.在总结矿床地质特征的基础上，通过流体包裹体、绿泥石温度计、同位素和地球化学特征等研究，认为该矿床形成于早古生代后碰撞阶段.矿床的形成经历了5个阶段，自矿体中心向外分为6个蚀变组合带；成矿流体起源自花岗质岩浆演化晚期，经与围岩交代、反应形成再平衡混合的岩浆水.它是温度为295℃左右、盐度为2.99%~4.57% NaCleqv、密度为0.75~0.77 g/cm3的流体，其中富含U6+、Na+、CO32-等组分，对SiO2、Fe2+、Mn2+、K+和Rb、Sr、Mo、Ga、Zr、Ba等组分有较强的溶蚀或交代能力.流体沸腾是成矿物质的主要卸载机制，pH、Eh值的变化促进了成矿物质的进一步卸载.
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| 关 键 词： | 芨岭 钠交代铀矿床 地球化学 组分迁移 热液来源 成矿机制 |
| 收稿时间： | 2018-08-13 |
Geological Characteristics and Its Genesis of the Jiling Na-Metasomatic Uranium Deposit in Longshou Mountains,Gansu Province |
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| Abstract: | The Jiling Na-metasomatic uranium deposit is one of the most important uranium deposits in NW China. Based on the deposit geological characteristics, we studied the inclusions in calcite, chlorite thermometer, isotope and geochemical characteristics in this paper. We considered that the Jiling uranium deposit was formed under post-collision background in the Early Paleozoic, which has experienced 5 stages, and includes 6 alteration zones from ore center to the edge of Na-metasomatic body. The ore bearing hydrothermal is rebalance water, which is generated from evolutive magma, reacted with wall rocks; its temperature is about 295℃, salinity is 2.99%-4.57% NaCleqv and density is 0.75-0.77 g/cm3.The hydrothermal fluid is rich in U6+, Na+, CO32-, and has strong dissolution ability to SiO2, Fe2+, Mn2+, K+, Rb, Sr, Mo, Ga, Zr and Ba. Fluid boiling is main mechanism of ore deposition, and the changing of pH and Eh has promoted material deposition at the same time. |
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