| 粤北下庄铀矿田早古生代岩浆岩的发现及勘查意义 |
| 投稿时间：2024-01-12 修订日期：2024-04-06 点此下载全文 |
| 引用本文：冯志军.粤北下庄铀矿田早古生代岩浆岩的发现及勘查意义[J].地质与勘探,2025,61(1):85-99 |
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| 基金项目:中央地质勘查基金项目（编号：2009441002）资助 |
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| 中文摘要:华南地区南岭一带贵东岩体东部是国内重要的铀矿成矿区，区内粤北下庄铀矿田是国内首个由国内团队发现的花岗岩型铀矿田。该矿田已发现的产铀岩体成岩时代主要集中于印支期，前人勘查也主要集中在印支期花岗岩分布区，本次研究旨在评估新发现的矿田东部外围地区冬瓜岭岩体的成矿潜力。本文查明了冬瓜岭岩体的岩相学、岩石地球化学特征及锆石SHRIMP U–Pb年代学，并与区域主要成矿岩体进行对比分析，发现冬瓜岭岩体属于加里东期形成的中粒黑云母花岗岩，其岩相学和地球化学特征与区域上产铀花岗岩体相似，指示冬瓜岭岩体内部及其与寒武纪地层侵入接触边界外围有较好的铀矿找矿勘查远景。经找矿靶区优选，划定102–石角围断裂带和新桥–下庄断裂带夹持区为“攻深”靶区，有效深度为–500 m以下，将冬瓜岭岩体内部及坪田盆地区定为“探新”靶区，并划定出1个“早期高温铀矿化勘查区” ，有望大大拓展下庄矿田的找矿空间。 |
| 中文关键词:花岗岩型铀矿 加里东期 靶区优选 下庄铀矿田 南岭地区 |
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| Discovery and exploration significance of the Early Paleozoic magmatic rocks in the Xiazhuang uranium ore field of northern Guangdong Province |
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| Abstract:The eastern part of the Guidong pluton in Nanling area of South China is an important uranium deposit area in China, and the Xiazhuang uranium deposit in this area is the first granite-type uranium deposit discovered by Chinese. The crystallization age of the discovered uranium-producing pluton in this area was mainly concentrated in the Indosinian, and previous exploration was mainly concentrated in the granite distribution area of Indosinian age. The purpose of this study is to evaluate the metallogenic potential of the Donggualing pluton in the eastern peripheral area of the newly discovered ore field. This work determined the petrology, petrochemical features and zircon SHRIMP dating characteristics of the Donggualing rock mass. Compared with the main regional ore-forming rock masses, the Donggualing pluton was inferred to be a medium-grained biotite granite formed in the Caledonian period, and its petrographic and geochemical characteristics were similar to those of uranium-producing granite. This provides a theoretical basis for further uranium exploration in the interior of the Donggualing pluton and outside the intrusive contact boundary with Cambrian strata in the basin. The selection of prospecting exploration target areas suggests that, the 102 Shijiaowei fault zone and the Xinqiao Xiazhuang fault zone were designated as deep prospecting target areas with effective depths below -500 m. The interior of the Donggualing rock mass and the Pingtian Basin area were designated as "new exploration" target areas, and one "early high-temperature uranium mineralization exploration area" was designated, which is expected to greatly expand the exploration space of the Xiazhuang ore field. |
| keywords:granite-type uranium ore, Caledonian, preferred target area, Xiazhuang ore field, Nanling area |
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