| 四川拉拉IOCG矿床气成-热液成矿期磁铁矿地球化学特征及其成矿意义 |
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| 引用本文： | 张进平,黄从俊.四川拉拉IOCG矿床气成-热液成矿期磁铁矿地球化学特征及其成矿意义[J].矿产与地质,2021(1):76-82. |
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| 作者姓名： | 张进平 黄从俊 |
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| 作者单位： | 山东省第四地质矿产勘查院;中国地质调查局成都地质调查中心 |
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| 摘 要： | 四川省拉拉铁氧化物-铜-金(IOCG)矿床位于扬子地块西南缘,磁铁矿是矿床中重要的矿石矿物及Fe质的主要载体之一。结合矿相学及电子探针研究方法,探讨矿床中气成-热液成矿期磁铁矿的成因特征及Fe质来源。矿相学研究表明,气成-热液成矿期磁铁矿呈自形晶,与黄铜矿共伴生产出。电子探针分析表明,气成-热液成矿期粗粒自形晶磁铁矿主要成分为TFeO,其余成分不超过1%,为典型磁铁矿。①气成-热液成矿期粗粒自形晶磁铁矿为热液成因,Fe质来自岩浆热液;②高氧逸度的岩浆/热液有利于Cu-Au的迁移聚集,磁铁矿的结晶作用过程中伴随着氧化态硫酸盐(SO 2-4)向还原态硫(H 2 S)转化的还原作用,降低成矿系统的氧化还原势,从而推进后续Cu-Au硫化物的沉淀成矿;③研究结果还补充了林师整(1982)建立的磁铁矿成因判别图解空白部分。
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| 关 键 词： | 拉拉IOCG矿床 磁铁矿 地球化学特征 成矿意义 |
Geochemical characteristics and metallogenic significance of magnetite of gas-hydrothermal mineralization phase in Lala IOCG deposit,Sichuan |
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| ZHANG Jinping,HUANG Congjun.Geochemical characteristics and metallogenic significance of magnetite of gas-hydrothermal mineralization phase in Lala IOCG deposit,Sichuan[J].Mineral Resources and Geology,2021(1):76-82. |
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| Authors: | ZHANG Jinping HUANG Congjun |
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| Institution: | (Shandong Provincial No.4 Institute of Geological and Mineral Survey,Weifang 261021,Shandong,China;Chengdu Geological Survey Center,China Geological Survey,Chengdu 610081,Sichuan,China) |
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| Abstract: | Lala iron oxide-copper-gold(IOCG)deposit in Sichuan Province is located at the southwest margin of the Yangtze block.Magnetite is an important ore mineral and one of the main carriers of iron in the deposit.On the basis of mineralography and electron probe research methods,the genetic characteristics and the source of Fe of magnetite of gas-hydrothermal mineralization phase in the deposit are discussed.The study of mineralography shows that magnetite of gas-hydrothermal ore-forming phase is self-formed crystal and is produced and associated with chalcopyrite.Electron probe analysis shows that the main component of coarse-grained and self-shaped magnetite of gas-hydrothermal mineralization phase is FeO,and the other components are not more than 1%,it is a typical magnetite.①The coarse-grained self-shaped magnetite of gas-hydrothermal mineralization phase is of hydrothermal genesis,and Fe comes from the magmatic hydrothermal fluid.②The magma/hydrothermal fluid with high oxygen fugacity is beneficial to the migration and accumulation of Cu-Au elements.The crystallization process of magnetite is accompanied by the reduction of oxidized sulfate(SO 2-4)to reduced sulfur(H 2 S),which reduces the redox potential of the mineralization system and promotes Cu-Au sulfide precipitation and mineralization in the subsequent.③The research result has also supplemented the blank part of the magnetite genesis discrimination diagram established by Lin Shizheng(1982). |
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| Keywords: | Lala IOCG deposit magnetite geochemical characteristics metallogenic significance |
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