| 西藏帮布勒矿床磁铁矿化学成分特征及其地质意义 |
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| 关键词:magnetite texture and chemical composition mineralization processes Bangbule, Xizang |
| 基金项目:本文由国家自然科学基金项目(编号: 42302098)、国家重点研发计划项目(编号: 2022YFC2905002)和自然资源部深地科学与探测技术实验室开放基金项目(编号: SL202415)联合资助。 |
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| Chemical Composition Characteristics and Geological Significance of Magnetite from the Bangbule Deposit, Xizang |
| The Bangbule deposit, located in the western section of the Gangdise metallogenic belt in Xizang, is a recently discovered large skarn-type lead-zinc deposit. Magnetite is widely developed in the deposit, and its texture and chemical composition characteristics are of great significance for revealing the physical-chemical conditions of ore formation and the evolution of ore-forming fluids. This study investigated different generations of magnetite in the Bangbule deposit using mineralogical observations and electron microprobe analyses to reveal their textural and compositional characteristics. The results showed that magnetite in the Bangbule deposit could be categorized into two generations: MagⅠ, which predominantly filled gaps within hedenbergite grains and was chemically characterized by high Mn content; and MagII, which was associated with quartz and exhibited a low Mn content. The chemical composition of magnetite was characterized by high levels of Mg, Al, Ca, and Mn, as well as low Ti levels, which was typical of skarn deposits with hydrothermal origins. Furthermore, from MagⅠ to MagII, the ore-forming fluid underwent a transition from conditions of high oxygen fugacity and low water–rock ratio to low oxygen fugacity and high water–rock ratio. The formation environments remained relatively stable at medium to high temperatures. This study developed a fluid evolution model for magnetite formation in the Bangbule deposit, which indicated the fine delineation of the metallogenic fluid evolution. Systematic analyses of the relationship between magnetite chemical elements and deposit genesis provided data sources and constraints for intelligent mineral exploration and machine learning applications. |
| XUN Shuaijie,ZHANG Hongbin,ZHANG Qizhi,WANG Yong,WU Jianghua,HONG Chenyu,CAO Rui.2026.Chemical Composition Characteristics and Geological Significance of Magnetite from the Bangbule Deposit, Xizang[J].Acta Geoscientica Sinica,47(3):541-554. |
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