智利卡门铁矿床磁铁矿元素地球化学特征及矿床成因意义
Geochemical characteristics of magnetite from the Carmen iron deposit in Chile and its genetic significance
查看参考文献35篇
文摘
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卡门铁矿床位于智利著名的中生代铁-铜-金成矿带内,本文根据矿石组构和矿物共生特征将卡门铁矿床成矿期次划分为硅化阶段、磁铁矿阶段、黄铜矿阶段和晚期热液脉阶段4个阶段。卡门铁矿床磁铁矿有两种类型:含硫化物块状磁铁矿、与阳起石共生磁铁矿,以含硫化物块状磁铁矿为主。电子探针研究表明,该矿床与阳起石共生磁铁矿的FeO_T含量略高于含硫化物块状磁铁矿;整体上来看,磁铁矿的FeO_T与SiO_2、Al_2O_3、MgO呈负相关关系。激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)微量元素成分分析表明,卡门磁铁矿轻稀土元素亏损,重稀土元素富集且分馏程度相对较大;Co、Ni元素含量高,与夕卡岩型磁铁矿较为接近,但Ni/Co比值变化较大,与夕卡岩型有明显差异,说明卡门磁铁矿与典型夕卡岩成因的磁铁矿存在一定差别,同时较高的Ni/Co比值反映了其成因与深源物质有关。卡门铁矿床磁铁矿TiO_2-Al_2O_3-(MgO+MnO)三角图表明该矿床具有热液交代特征,与夕卡岩相关;(Ca+Al+Mn)-(Ti+V)成因判别图也显示该矿床有夕卡岩型铁矿特征,但同时也与IOCG型矿床有一定的相似性,这进一步证明卡门铁矿床可能并非典型的夕卡岩矿床,其成矿可能与铁氧化物铜金(IOCG)型成矿过程岩浆热液活动密切相关,这与卡门铁矿床处于智利IOCG成矿带的地质事实一致。 |
其他语种文摘
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The Carmen iron deposit is located in the Chile iron oxide-Cu-Au (IOCG) metallogenic belt. On the basis of ore textures and mineral assemblages, the ore-forming process can be divided into four stages: the silicification stage, the magnetite stage, the chalcopyrite stage and the late vein stage. There are two types of magnetite in the Carmen iron deposit: one is massive magnetite including sulfide and the other is magnetite which is associated with actinolite, with the former playing a dominant role. EMP study shows that the contents of FeO_T in the magnetite associated with actinolite are higher than those of massive magnetite including sulfide. The contents of FeO_T are negatively related with those of SiO_2, Al_2O_3 and MgO. The trace elements generated by LA-ICP-MS show that the the magnetite is depleted in LREE and enriched in HREE; the contents of Co and Ti are high, similar to those of the skarn-type deposits. However, large variations in Ni/Со ratio are very different from the case encountered in skarns, which suggests that Carmen is probably not a typical skarn deposit, and the higher Ni/Со ratio reflects that its genesis is related with deep-source materials. Both ternary plot of TiO_2-Al_2O_3-(MgO+MnO) and (Ca+Al+Mn)-(Ti+V) discriminant diagrams suggest that the Carmen iron deposit shows a strong skarn affinity, but also a clear genetic connection with the IOCG-type mineralization in this district. |
来源
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地球化学
,2016,45(4):387-397 【核心库】
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关键词
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磁铁矿
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电子探针
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LA-ICP-MS
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卡门铁矿床
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夕卡岩
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IOCG
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地址
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1.
中国科学院广州地球化学研究所, 广东, 广州, 510640
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中国科学院广州地球化学研究所, 广东省矿物物理与材料研究开发重点实验室, 广东, 广州, 510640
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0379-1726 |
学科
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地质学 |
基金
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国家自然科学基金
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中国科学院创新交叉团队项目
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文献收藏号
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CSCD:5756351
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