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.