首页|赣东北新安地区火山岩稀土元素地球化学特征及铀矿物质来源

赣东北新安地区火山岩稀土元素地球化学特征及铀矿物质来源

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赣东北地区位于华夏陆块钦杭结合带中段赣杭构造带内,其矿产资源种类繁多,储量丰富,具有较高的开发潜力和经济价值.通过对赣东北新安地区含矿火山岩样品进行稀土地球化学特征分析,研究其沉积环境和物质来源,并总结该区的铀矿物质来源,探讨该区矿床成因.结果表明:该区火山岩样品稀土元素的物质可能主要来自地壳.轻稀土元素相对富集,而重稀土元素相对亏损.Eu和Ce的负异常进一步揭示在火山作用过程中斜长石的结晶分异作用及其对稀土元素分布的影响.火山岩源岩主要为沉积岩和少量花岗岩,表明新安地区火山岩的物质来源主要为上地壳,且以沉积岩部分熔融为主.该区火山岩铀丰度高,且具有较好的物源条件,是形成火山岩型铀矿的重要物质基础.
Geochemistry characteristics of the rare earth elements in volcanic rocks and the source of uranium minerals in the Xin'an area of northeastern Jiangxi
The northeastern Jiangxi region is located in the middle section of the Qinhang junction zone on the Cathaysia Block,within the Ganhang tectonic belt.It boasts a wide variety of mineral resources with abun-dant reserves,presenting high development potential and economic value.Through the analysis of rare earth geochemical characteristics of ore-bearing volcanic rock samples from the Xin'an area in northeastern Jiangxi,this study investigates the sedimentary environment and material sources,summarizes the origin of uranium minerals in the area,and discusses the genesis of the ore deposits.The results indicate that the rare earth el-ements in the volcanic rocks of this area are primarily derived from the crust.Light rare earth elements are relatively enriched,while heavy rare earth elements are relatively depleted.Negative anomalies of Eu and Ce further reveal the crystallization differentiation of plagioclase during volcanic processes and its impact on the distribution of rare earth elements.The source rocks of the volcanic rocks are mainly sedimentary rocks with minor granites,indicating that the material source of the volcanic activity in the Xin'an area is predominantly from the upper crust,with partial melting of sedimentary rocks being the main process.The volcanic rocks have high uranium abundance and favorable source conditions,forming an important material basis for the development of volcanic rock-type uranium deposits in this area.

volcanic rocksrare earth elementsgeochemistryXin'an areanortheastern Jiangxi

昝芳、张恒、雷炼

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江西省地质局第六地质大队,江西鹰潭 335001

火山岩 稀土元素 地球化学 新安地区 赣东北

2024

矿产与地质
桂林矿产地质研究院

矿产与地质

CSTPCD
影响因子:0.42
ISSN:1001-5663
年,卷(期):2024.38(6)