| 阮昆,闵壮,钟福军,吴建勇,龙自强.粤东北黄田铀矿床中粒斑状黑云母花岗岩年代学、地球化学特征及其地质意义[J].矿产勘查,2026,17(5):799-811 |
| 粤东北黄田铀矿床中粒斑状黑云母花岗岩年代学、地球化学特征及其地质意义 |
| Chronology, geochemical, and geological significance of medium-grained porphyritic biotite granites in the Huangtian uranium deposit in northeastern Guangdong, China |
| 投稿时间：2025-11-08 |
| DOI：10.20008/j.kckc.202605005 |
| 中文关键词: 花岗岩 年代学 地球化学 黄田铀矿床 成矿背景 |
| 英文关键词: granite geochronology geochemistry Huangtian uranium deposit metallogenic setting |
| 基金项目:本文受中国核工业地质局铀矿调查与科研项目(202241-4、202535-1)、广东省科技专项基金项目(201112166271152)、国家自然科学基金项目(42362011)、江西省自然科学基金(20252BAC220019)、江西省职业早期青年科技人才培养项目(20252BEJ730293)、江西水利电力大学博士科研启动项目(2024kyqd002)联合资助。 |
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| 中文摘要: |
| 粤东北黄田铀矿床是中国华南重要的中生代铀矿床之一，其赋矿岩体为中粒斑状黑云母花岗岩。为了阐述该岩体的岩石成因、构造背景及成矿意义，本文开展了岩相学、锆石 U-Pb年代学及岩石地球化学分析。结果表明，该岩体的锆石 U-Pb加权平均年龄为(158.9±0.7)Ma，具有高硅、富钾、准铝质特征，属高钾钙碱性系列；稀土元素配分曲线呈右倾型，轻稀土富集，具明显 Eu负异常，显示出强烈的分异作用；微量元素具有典型的壳源特征。结合区域地质背景，认为该岩体属壳源重熔型高分异花岗岩，源于以泥质岩为主的沉积岩部分熔融，形成于岩石圈伸展环境下的壳源重熔过程，其高分异、高钾、富挥发分的特征为铀成矿提供了有利的物质和空间条件。 |
| 英文摘要: |
| The Huangtian uranium deposit in northeastern Guangdong is one of the important Mesozoic ura-nium deposits in South China. The ore-hosting rock is a medium-grained porphyritic biotite granite. To elucidatethe petrogenesis, tectonic setting, and metallogenic implications of this rock body, petrographic observations, zirconU-Pb dating, and geochemical analyses were conducted. The results show that the granite yields a zircon U-Pbweighted mean age of (158.9±0.7) Ma, with geochemical characteristics of high SiO2, high K2O, and peraluminous af-finity, belonging to the high-K calc-alkaline series. The chondrite-normalized REE patterns are right-inclined withsignificant light REE enrichment and a pronounced negative Eu anomaly, indicative of extensive magmatic differen-tiation. Trace elements display typical crustal-derived signatures. Integrated with regional geological background,we classify the Baipu granite as a highly fractionated crustal remelting type, derived from the partial melting ofpelitic-dominated sedimentary rocks, formed in a lithospheric extensional setting. Its highly fractionated nature,high K2O, and enrichment in volatiles provide favorable chemical and physical conditions for uranium mineralization. |
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