| 江西宁都坎田萤石矿床稀土元素地球化学特征及其指示意义 |
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| 关键词:fluorite ore REE ore-forming fluid genesis of mineral deposit Ningdu County, Jiangxi Province |
| 基金项目:中央级公益性科研院所基本科研业务费专项（编号: KK2005）;中国地质调查局地质调查项目(编号: DD20190816; DD20190606; DD20221684) |
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| REE Geochemistry of Fluorite from Kantian Fluorite Deposit and Its Geological Implications in Ningdu Area, Jiangxi Province |
| The Kantian fluorite deposit is located in the Xingguo–Ningdu fluorite metallogenic belt in southern Jiangxi Province, where fluorite resources are abundant. The orebody occurs in Late Jurassic biotite granite. Based on the regional geological background of the study area, the REE geochemical characteristics of the fluorite and surrounding rock of the Kantian fluorite deposit in Ningdu, Jiangxi Province, were studied to evaluate the source of the ore-forming fluid and genesis of the deposit. The total REE concentrations of fluorites range from 34.11×10–6 to 78.12×10–6, the chondrite normalized REE distribution pattern is characterized by relative enrichment of LREEs, and the LREEs have similar distribution patterns. The total REE concentrations of wall rocks range from 94.14×10–6 to 175.72×10–6, the REE distribution patterns of fluorites and wall rocks have similar synchronization, and the Sm/Nd ratios of fluorite and surrounding rock are similar, indicating that the source of the ore-forming fluid of the fluorite was closely related to the surrounding rock. By considering these results in combination with previous studies on hydrogen and oxygen isotope characteristics of fluorite gas-liquid inclusions in southern Jiangxi, it was concluded that the ore-forming fluids were mainly derived from meteoric precipitation and that the ore-forming elements Ca and F were mainly derived from precipitation leaching and extraction from biotite granites of the early Yanshanian. Based on the geological background, strong negative Eu anomalies of fluorite, and the Tb/Ca-Tb/La relationship diagram in the study area, it was determined that the fluorite ore in the study area is a middle-low temperature hydrothermal filling fluorite deposit formed under a reductive environment. |
| YOU Chao,WANG Chun-lian,LIU Dian-he,YU Xiao-can,YAN Kai,LIU Si-han,ZHOU Bo-wen.2022.REE Geochemistry of Fluorite from Kantian Fluorite Deposit and Its Geological Implications in Ningdu Area, Jiangxi Province[J].Acta Geoscientica Sinica,43(3):359-370. |
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