【摘要】 铌(Nb)、钽(Ta)、铷(Rb)、铯(Cs)作为战略性关键金属，因其卓越的性能在国民经济发展所依托的新兴产业中占据着不可替代的重要地位。然而，因面临着地壳含量低、储量有限、分布零散、赋存状态不明以及嵌布特征复杂等诸多难题，这些因素极大地制约了相关矿产资源的开发利用进程。这些元素常共同富集于高分异花岗岩体系之中，因此，深入研究该体系中铌、钽、铷、铯赋存状态，对于精准查明成矿机制、建立成矿规律、判别成矿潜力具有至关重要的意义，能够为找矿勘查工作提供重要理论依据。铌、钽、铷、铯均属于不相容元素，在岩浆的分离结晶过程中，它们会随着岩浆演化进程，在晚期逐步富集。不过，由于这些元素的性质存在差异，赋存矿物也大不相同。铌钽赋存的独立矿物有180种，其中以氧化物为主，如铌铁矿族矿物、烧绿石超族、褐钇铌矿等;硅酸盐次之。同时铌钽与钛的性质相似，它们能够置换Ti的位置进入晶格中赋存，如金红石、榍石、云母等。本文围绕铌钽赋存矿物展开讨论，深入剖析了其结晶环境的物理化学条件、在热液过程中的活动性、富钽矿物的不共溶区特征以及铌钽分异行为等内容。此外，综合论述了铌钽不同赋存矿物结晶对成矿作用的指示意义。铷铯属于碱金属，离子半径较大，独立矿物相对较少，其中铷赋存的独立矿物3种;铯赋存的独立矿物二十余种，常见的包括铯沸石、铯锂云母、南平石、铯绿柱石等硅酸盐矿物，这些铯矿物中通常也含有一定量的铷。同时，铷铯还常通过置换钾离子进入到晶格中，常在钾长石、云母等矿物中富集，这些矿物的形成需要更高的演化程度，明显晚于岩浆期铌钽矿物，且受到更多流体作用的影响。铷和铯的富集成矿过程既存在相似性，又具有差异性。本文系统总结了高分异花岗岩体系中铌、钽、铷、铯赋存矿物的研究成果。在当前地质研究新范式的推动下，针对矿物赋存形式和状态的研究，有望在示踪铌、钽、铷、铯成矿作用全过程和资源开发利用中发挥更为重要的作用。更多还原

【Abstract】 Niobium( Nb),tantalum( Ta),rubidium( Rb),and cesium( Cs) are important critical metals. Due to their exceptional properties,they are irreplaceable in emerging industries vital to national economic development. However,issues such as their low crustal abundance,small reserves,scattered distribution,unclear occurrence states,and complex intergrowth characteristics significantly hinder the development and utilization of related mineral resources. These elements can all become enriched in highly fractionated granite systems. Therefore,investigating the occurrence states of Nb,Ta,Rb and Cs within such systems enables a clearer understanding of ore-forming mechanisms,the establishment of metallogenic regularities,the assessment of metallogenic potential,and ultimately provides critical evidence for mineral exploration. Niobium,Ta,Rb and Cs are all incompatible elements that become more enriched during the late stages of magmatic fractional crystallization. However,their geochemical properties differ significantly,and their host minerals also exhibit substantial variations. There are 180 validated Nb-Ta minerals,predominantly oxides( e. g.,columbite group minerals,pyrochlore supergroup minerals,fergusonite),followed by Nb-Ta-bearing silicates. Additionally,due to the chemical similarity between Nb-Ta and Ti,these elements can substitute for Ti within crystal lattices,occurring in minerals such as rutile,titanite,and micas. We focus on the occurrence of Nb-Ta minerals,showing the physicochemical conditions of their crystallization environments,the characteristics of miscibility gap between Ta-rich minerals,the elemental behavior during hydrothermal processes,and the strong Nb-Ta fractionation. Furthermore,it discusses the indicative significance of different occurrence states of niobium and tantalum for ore-forming processes. Rubidium and Cs belong to the alkali metals,characterized by relatively large ionic radii and a scarcity of independent minerals. Specifically,there are only three validated Rb minerals for,while over twenty Cs minerals,including common silicate minerals such as pollucite,sokolovaite,nanpingite,and pezzottaite. However,Rb and Cs also frequently substitute for K within crystal lattices,leading to their enrichment in minerals like K-feldspar and micas. These minerals require a higher degree of magmatic evolution,forming significantly later than primary Nb-Ta minerals during the magmatic stage and being more strongly influenced by subsequent hydrothermal fluid activities. The enrichment and mineralization of Rb and Cs exhibit both similarities and differences. This paper systematically summarizes the recent researches on the occurrence states of Nb,Ta,Rb,and Cs within highly fractionated granite systems. Driven by the new approaches in current geological research,studies on mineral occurrence forms and states are expected to play a more crucial role in tracing the rare metals mineralization,especially Nb,Ta,Rb,and Cs,as well as in resource utilization.更多还原