山东国土资源2023，Vol.39Issue(11)：32-41,10.DOI:10.12128/j.issn.1672-6979.2023.11.004
鲁西微山稀土矿床成矿机制研究现状及展望
Present Condition of Prospect Study on Metallogenic Mechanism of Weishan Rare Earth Element Deposit in Western Shandong Province
摘要
Abstract
Weishan rare earth element deposit in western Shandong province is a typical endogenic light rare earth element deposit of carbonatite type.Its metallogenic mechanism is still divergent in terms of crystal-lization differentiation,fluids immiscibility and hydrothermal alteration process.A large number of melt inclusions,melt fluid inclusions and CO2 rich fluid inclusions are formed in rare earth element deposit.These inclusions are easy to decrepitate or leakage during the temperature measurement at atmospheric pressure.It is difficult to measure their total homogenization temperature and other phase change data,which leads to unclear understanding of the complete evolution process of ore-forming fluids from magma to magma-hydrothermal solution and its thermodynamic properties.As a result,the complete evolution process and thermodynamic properties of ore-forming fluids from magma to magma-hydrothermal and to hydrothermal fluids stage in the deposit are still unclear.In addition,the mechanism of efficient migra-tion,enrichment and precipitation of rare earth elements in ore-forming fluids at various stages of evolu-tion is still lack of constraints from in-situ micro-area composition analysis and high-temperature and high-pressure experimental simulation.The problems existing in the above studies have greatly limited the researchers'in-depth understanding of the metallogenic mechanism of the Weishan rare earth element deposit.In the future,in order to solve the above problems,the complete evolution process of ore-form-ing fluids can be clarified by homogeneous temperature measurement of melt inclusions,melt-fluid inclu-sions and CO2 rich fluid inclusions with high internal pressure by using the hydrothermal diamond-anvil cell(HDAC).In situ LA-ICP-MS microanalysis of individual inclusion should be carried out to quanti-tatively characterize the distribution behavior of rare earth elements in the evolution of magmatic fluids.HDAC together with Raman spectrometer are used to simulate the types of complexes of rare earth ele-ments that effectively migrate after complexing with ligands,such as CO32-,SO42-and F-and the precipita-tion mechanism of bastnaesite.Finally,the complete evolution process of ore-forming fluids and rare earth element enrichment and mineralization mechanism of Weishan rare earth element deposit will clearly clarified,which provides a new research idea for the study of ore-forming fluids evolutionary process and mineralization mechanism of carbonatite type rare earth element deposit.It also solves the"bottleneck"ex-perimental technical problem that the homogenization temperatures of melt inclusions,melt-fluid inclu-sions and CO2 rich fluid inclusions in carbonatite rare earth element deposits are difficult to determine.关键词
微山稀土矿床/熔体包裹体/富CO2流体包裹体/成矿机制/鲁西Key words
Weishan rare earth deposit/melt inclusions/CO2 rich fluid inclusions/metallogenic mecha-nism/western Shandong province分类
天文与地球科学引用本文复制引用
李胜虎,舒磊,马晓东,郭广军,熊玉新,王海芹,李敏,胡笑伟,兰君,李得建,单伟,迟乃杰..鲁西微山稀土矿床成矿机制研究现状及展望[J].山东国土资源,2023,39(11):32-41,10.基金项目
山东省自然科学基金青年项目(项目编号:ZR2020QD029) （项目编号:ZR2020QD029）
山东省自然科学基金面上项目(项目编号:ZR2020MD030、ZR2021MD052) （项目编号:ZR2020MD030、ZR2021MD052）
中国地质调查局中国矿产地质志项目(DD20221695) （DD20221695）
山东地质勘查项目(鲁勘字[2020]7号)联合资助 （鲁勘字[2020]7号）
