现代地质2025，Vol.39Issue(3)：612-627,16.DOI:10.19657/j.geoscience.1000-8527.2024.131
山东微山稀土矿床成因研究:稀土矿物学约束
Genetic Study of Weishan Rare Earth Deposit in Shandong Province:Constraints of Rare Earth Mineralogy
摘要
Abstract
The Weishan rare earth element(REE)deposit in Shandong is located in the Laiwu-Zibo-Weishan REE belt in the eastern part of the North China Craton and is one of the three major light REE deposits in China.To better investigate the migration and enrichment processes of REEs,this study conducted detailed mineralogical research on the Weishan deposit.Based on the mineral paragenesis and cross-cutting relationships between veins,the hydrothermal mineralization of the Weishan rare earth deposit was divided into four stages:(Ⅰ)K-feldspar+quartz+calcite,(Ⅱ)sulfate+quartz+calcite,(Ⅲ)REE minerals+quartz+calcite+sul-fate+fluorite,and(Ⅳ)calcite+quartz+fluorite+sulfides.Scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS)and electron probe microanalysis(EPMA)of each mineralization stage revealed that the main REE minerals are bastnäsite,parisite,strontianite-(Ce),and minor monazite,(Ce)apatite,and thorite.Additionally,these REE minerals are closely associated with fluorite,calcite,and sulfate minerals,in-dicating that the ore-forming fluid was likely a H2O-CO2-NaCl-F-REE-SO42-hydrothermal system.Dur-ing the mineralization process,ions such as F-,Cl-,CO32-,and SO42-contributed to varying degrees to the migration and enrichment of key ore-forming elements.Considering the regional tectonic background,this paper proposes that the Weishan REE deposit formed under the tectonic regime of the rollback of the subducting Paleo-Pacific Plate,with the complex late-stage differentiation of crust-mantle mixed magma and associated ore-form-ing fluids playing a key role in the mineralization process.关键词
矿物组合/成矿流体/矿床成因/成矿模式/微山稀土矿床Key words
mineral assemblage/ore-forming fluids/ore genesis/mineralization model/Weishan rare earth deposit分类
天文与地球科学引用本文复制引用
兰君,王健,刘晓,张鹏,邢楠,李志民,李健,徐洪岩,蓝廷广,王石..山东微山稀土矿床成因研究:稀土矿物学约束[J].现代地质,2025,39(3):612-627,16.基金项目
国家自然科学基金重点基金项目"碳酸岩-碱性岩岩浆-热液演化与稀土成矿作用"(41930430) （41930430）
山东省地勘基金项目"山东省微山县郗山地区稀土矿深部及外围调查评价(续作)"(鲁勘字(2020)32号)和山东省自然科学基金"碱性岩对稀土元素富集的制约—以郗山稀土矿床为例"(ZR2021QD106)项目. （续作）
