| 胡 鹏.“交点”型铀矿有关的铀活化、迁移、富集特征—以广东荷泗地区为例[J].地质与勘探,2020,56(3):478-490 |
| “交点”型铀矿有关的铀活化、迁移、富集特征—以广东荷泗地区为例 |
| Characteristics of remobilization, migration and enrichment of uranium related to "intersection" type uranium deposits: A case study of the Hesi area, Guangdong Province |
| 投稿时间：2019-03-29 修订日期：2020-01-20 |
| DOI：10.12134/j.dzykt.2020.03.002 |
| 中文关键词: 地面伽玛能谱 古铀含量 铀迁移量 活化与迁移 荷泗地区 广东 |
| 英文关键词: ground gamma spectrometry, original uranium content, uranium migration content, remobilization and migration, Hesi area, Guangdong Province |
| 基金项目:中国核工业地质局项目广东省下庄矿集区铀矿资源调查评价与勘查（编号：201924）资助 |
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| 中文摘要: |
| “交点”型铀矿指产于基性岩脉与硅化断裂带交汇部位的铀矿，具有埋藏浅、品位富、铀浸出率高等优点。文章紧密围绕“交点”型铀成矿过程中所经历的“源-运-储”过程，立足于荷泗地区与铀矿密切相关的基性岩脉自身铀含量低，与其有成因联系的流体无法提供有效铀源的客观事实，证实“交点”型铀矿床中的铀确为花岗岩体中的铀活化、迁移、富集而来。笔者借鉴前人运用航空伽玛能谱测量成果重建铀活化迁移的路径的成功经验，利用地面伽玛能谱测量成果构建古铀含量（GU）、铀迁移量（Um）两项特征参数表征“交点”型铀成矿中的“源-运-储”过程，并初步查明区内铀源区、铀富集区的分布情况及活化铀的可能迁移路径。然后，通过对铀富集区的工程揭露发现基性岩脉在“交点”型铀成矿过程中主要起还原障及成矿空间的作用；而后期含硅热液（富氧?）则为铀活化的主要驱动力。二者与裂隙中地下水共同作用，形成含铀热液的对流循环体系，不断促使花岗岩中铀的向辉绿岩迁移富集成矿，并以实测数据为例从“源-运-储”三方面构建“交点”型铀成矿模式。 |
| 英文摘要: |
| The "intersection" type uranium deposit refers to the uranium deposit occurring at the intersection of basic dikes and silicified fault zones, which is characterized by shallow burial, high grade and high uranium leaching rate. Based on measurement data from the Hesi area of Guangdong Province, this work reconstructs the geological process of “source-migration-storage” in the mineralization of such deposits and proved their uranium arose from activation, migration and enrichment of this element. In this area, the uranium content is very low in mafic dikes, so the mafic dikes could not provide sufficient uranium to mineralization, instead derived from the granite bodies. In light of the successful experience about reconstructing the path of uranium activation and migration by using airborne gamma-ray spectrometry, this work utilizes ground gamma-ray spectrometry to reconstruct two kinds of characteristic parameters. One is paleouranium content (GU), the other is the amount of uranium migration(Um), which permit to determine the distributions of uranium source, enrichment area of uranium and the possible migration path of activated uranium. Then trench in the uranium enrichment area reveals that mafic dikes play a major role as a reducing barrier and metallogenic space in the mineralization process, while the later siliceous hydrothermal fluid (oxygen-rich?) is the main driving force for uranium activation. Combined with groundwater in cracks under the ground, mafic dikes and later siliceous hydrothermal fluid formed a convective circulation system of uranium-bearing hydrothermal solution, which continuously drove the migration and enrichment of uranium from granite to diabase. From these inferences, this work establishes a metallogenic model of "source-transport-storage" for intersection-type uranium deposits. |
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