磁铁矿结构和化学成分标型对铁多金属成矿作用制约的研究进展  

A review for Fe-polymetallic mineralization constrains from the typology of texture and geochemical contents of the magnetite

作　　者：郭运康 杨东 林淞[1,3] 康志宏 何昕悦 唐昆 王永彬 GUO YunKang;YANG Dong;LIN Song;KANG ZhiHong;HE XinYue;TANG Kun;WANG YongBin(Yunnan Key Laboratory of Earth System Science,Yunnan University,Kunming 650500,China;Chongqing Bureau of Geology and Minerals Exploration 607 Geological Team,Chongqing 400054,China;Yunnan Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,Kunming 650051,China;Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd,Kunming 6500051,China)

机构地区：[1]云南大学,云南省地球系统科学重点实验室,昆明650500 [2]重庆市地质矿产勘查开发局607地质队,重庆400054 [3]云南省三江成矿作用及资源勘查利用重点实验室,昆明650051 [4]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051

出　　处：《岩石学报》2025年第2期669-692,共24页Acta Petrologica Sinica

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0801、2019QZKK0704);国家自然科学基金项目(42162009);云南省基础研究专项-重点项目(202201AS070004);云南大学研究生科研创新基金项目(KC-22221803)联合资助.

摘　　要：磁铁矿作为铁多金属矿床重要的矿石矿物,已经成为成矿作用的直接见证者,不仅影响早期的岩浆作用,而且参与后期的热液作用,这使得利用磁铁矿限定铁多金属成矿作用的难度增加。本文尝试以磁铁矿结构和成分为主线,立足于其晶体和微观结构,结合其现代元素和同位素分析进展,系统梳理其在铁多金属成矿作用研究的进展,具体包括:(1)磁铁矿的Re-Os、Ar-Ar和U-Th-He定年,可在一定程度上限定成矿年龄;(2)磁铁矿的Co/Ni比值、REEs含量、O-Fe-Ti同位素组成,可以较好地限定成矿物质来源;(3)磁铁矿的Eu异常、Ti/V比值、Cr含量及Fe同位素组成,可以有效地限定成矿的氧逸度;(4)磁铁矿中微量元素含量(Ti、Al、V、Ga、Mn、Zn)、比值及组合((Al+Mn)-(Ti+V)),可以很好地限定成矿的温度;(5)磁铁矿的主、微量元素组合,可以对判断矿床的类型提供一定的指示。然而,磁铁矿存在形成温度区间较大、微量元素含量较低、元素赋存状态不清等问题,使得部分成矿作用的限制存在误差,有待分析方法革新和数据处理优化,以期强化成矿年代学、物质来源示踪、物化条件限制和矿床类型判定的研究。Magnetite,as an essential ore mineral of iron polymetallic deposits,serves as a crucial indicator of mineralization process.It not only influences early magmatic activity but also participates in later hydrothermal processes,which directly increases the complexity of utilizing magnetite to constrain Fe-polymetallic mineralization.This article attempts to focus on the structure and composition of magnetite,and systematically reviews the progress in the research of polymetallic iron mineralization based on the crystal and microstructural characteristics along with modern analytical advancements of element and isotope studies of the magnetite.These studies highlight that:(1)Re-Os,Ar-Ar,and(U-Th)/He dating techniques can constrain the age of ore formation to some extent.(2)The Co/Ni ratios,REE contents,and O-Fe-Ti isotopic compositions of magnetite can provide valuable insights into the sources of ore-forming materials.(3)Indicators like the Eu anomaly,Ti/V ratios,Cr contents,and Fe isotopic compositions of the magnetite are effective in constraining the oxygen fugacity during the mineralization process.(4)The concentrations and ratios of trace elements(Ti,Al,V,Ga,Mn,Zn),along with combinations like((Al+Mn)-(Ti+V)),can effectively indicate the mineralization temperature.(5)The major-and trace-element compositions in magnetite can offer critical insights into the deposit typologies.However,challenges persist,including a broad temperature range for formation,low trace element contents,and ambiguous element occurrence statuses,which create uncertainties regarding metallogenesis and necessitate further in-depth research.Therefore,there is a need for innovations in analytical methods and optimization of data processing to enhance research in mineralization chronology,material source tracing,physico-chemical condition limitations,and the classification of deposit types.

关 键 词：磁铁矿 微量元素 同位素 成矿作用 

分 类 号：P578.46[天文地球—矿物学] P611[天文地球—地质学]