| 席 振.秘鲁安托尼奥铁矿区花岗闪长岩地球化学特征及其
地质意义[J].地质与勘探,2023,59(3):664-677 |
| 秘鲁安托尼奥铁矿区花岗闪长岩地球化学特征及其
地质意义 |
| Geochemical characteristics and geological significance of granodiorite in the Antonio iron ore deposit, Peru |
| 投稿时间：2022-05-02 修订日期：2022-08-23 |
| DOI：10.12134/j.dzykt.2023.03.017 |
| 中文关键词: 花岗闪长岩 地球化学 铁矿 安达胡拉斯-雅乌里岩基 秘鲁东部 |
| 英文关键词: granodiorite,geochemistry,iron ore,Andahuaylas-Yauri batholith,east of Peru |
| 基金项目:国家自然科学基金（编号：40827002）和中国地质调查局项目“安第斯巨型成矿带重要矿床地质背景、成矿作用和找矿潜力研
究”(编号：12120114010301）联合资助 |
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| 中文摘要: |
| 安托尼奥(Antonio)铁矿位于秘鲁中东部阿普里马克(Apurimac)始新世-渐新世斑岩-矽卡
岩型铜-钼(铁-金)成矿带,矿体的空间展布受到安达胡拉斯-雅乌里(Andahuaylas-Yauri)岩基岩石与弗若
巴木巴(Ferrobamba)组碳酸盐岩的接触带控制。矿区花岗闪长岩具有高硅和钠,低铁、镁和钙的特征,铝
饱和指数(A/CNK)为0.92~0.99,富集Rb、Ba、K、Sr等大离子亲石元素和活泼不相容元素,亏损Nb、Ti、
P等高场强(HFSE)元素,表现出准铝质I型花岗岩的特征。结合区域构造演化认为,花岗闪长岩为幔源镁
铁质岩浆结晶分异,可能有俯冲洋壳与下地壳部分熔体物质参与,形成于纳兹卡(Nazca)大洋板片低角度
俯冲到南美大陆板块之下的挤压背景向拉伸背景过渡时期。动力背景的转变有利于区域大量斑岩型及
相伴生的热液型、矽卡岩型矿化的形成。结合矿区地球物理勘查结果,安托尼奥出露的多个铁矿体在
矿区深部合并为一个矿体,向南西侧倾伏延深,并可能有其他类型矿体(矿石)出现。 |
| 英文摘要: |
| The Antonio iron ore deposit is located in the Eocene-Oligocene porphyritic-skarn Cu-molybdenum(Fe-Au)metallogenic belt of
Apurimac in central and eastern Peru.The spatial distribution of orebodies is controlled by the contact zone between the Andahuaylas-Yauri bedrock
and the Ferrobamba Formation carbonate rocks. The granodiorite in the mining area is characterized by high silicon and sodium,low iron,magnesium and
calcium,and aluminum saturation index (A/CNK) of 0.92~0.99.It displays enrichment of Rb,Ba,K,Sr and other large ion lithophilic elements and active
incompatible elements, and depletion of Nb,Ti,P and other high field strength(HFSE)elements,showing the characteristics of meta-aluminous I-type
granite. Combined with the regional tectonic evolution, it is suggested that the granodiorite is mantle-derived mafic magmatic crystallization and
differentiation,which may be involved in the subducted oceanic crust and partial melt material of the lower crust. The transformation of the geodynamic
background is conducive to the formation of a large number of porphyry and associated hydrothermal and skarn mineralization in the region. Combined
with the geophysical exploration results of the mining area,several iron ore bodies in Antonio were merged into one ore body in the deep part of the
mining area,which has a southward and west lateral incline and extends deeply,and other types of ore bodies (ores) may occur. |
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