REE Geochemistry of Fluorite from Kantian Fluorite Deposit and Its Geological Implications in Ningdu Area, Jiangxi Province
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摘要: 赣南地区萤石资源丰富, 坎田萤石矿位于赣南地区的兴国—宁都萤石成矿带上, 矿体赋存于晚侏罗世黑云母花岗岩内。本文结合研究区的区域地质背景, 对江西宁都坎田萤石矿床的萤石及围岩进行了稀土元素地球化学特征研究, 以探讨坎田萤石矿床的成矿流体来源和矿床成因。其研究结果表明, 萤石的稀土元素总量为 34.11×10–6～78.12×10–6, 属于轻稀土富集型, 稀土元素配分曲线形态基本一致; 围岩的稀土元素总量为 94.14×10–6～175.72×10–6, 其配分模式与萤石具有相似同步性, 且萤石与围岩具有相近的 Sm/Nd比值, 均表明萤石的成矿流体来源与围岩密切相关。结合前人在赣南地区对萤石气液包裹体进行氢氧同位素特征的研究, 认为成矿流体主要来源于大气降水, 成矿物质Ca和F元素主要来自于大气降水对燕山早期的黑云母花岗岩的淋滤和萃取。通过研究区的地质背景、萤石的强烈负Eu异常特征以及Tb/Ca-Tb/La关系图, 认为研究区萤石矿属于还原环境下的中低温热液充填型萤石矿床。Abstract: 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.
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Key words:
- fluorite ore /
- REE /
- ore-forming fluid /
- genesis of mineral deposit /
- Ningdu County, Jiangxi Province
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