| 李天成,杨新雨,彭晓明,胡良吉,王磊,陈家乐.智利中北部赛罗伊曼—月亮山—赛罗诺尔戴磁铁矿矿床地质特征与找矿标志[J].矿产勘查,2015,6(1):77-85 |
| 智利中北部赛罗伊曼—月亮山—赛罗诺尔戴磁铁矿矿床地质特征与找矿标志 |
| Geological characteristics and prospecting criteria of the magnetite deposits in Cerro Iman-Cerro Lunar-Cerro Norte area, central-northern Chile |
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| DOI： |
| 中文关键词: 智利 阿塔卡玛断裂带(AFZ) 白垩纪铁矿带 阳起石化 磁铁矿 磷灰石 |
| 英文关键词: Chile, Atacama fault zone (AFZ), cretaceous iron deposit belt, actinolitization, magnetite, apatite |
| 基金项目:科技支撑计划项目(编号:2006BAB01B090)和科技部科研院所技术开发专项(编号:2011EG115022)联合资助。 |
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| 中文摘要: |
| 智利中北部的赛罗伊曼—月亮山—赛罗诺尔戴磁铁矿矿床位于智利海岸山带白垩纪铁矿带的北段,与安第斯构造旋回的早期(侏罗纪—早白垩世)伸展阶段有关,为形成在钙碱性岩浆弧环境中与安山岩地层有关的矿床。矿化过程伴随强烈的热液活动,形成块状、网脉状、浸染状磁铁矿化以及热液角砾岩和围岩蚀变。蚀变岩石围绕矿体呈现出矿物和地球化学分带特征,岩石在接近矿体的内带产生强烈的阳起石化,矿体的远端产生钠长石化,外带的硅化和电气石化叠加在阳起石化和钠化蚀变岩之上。矿体自外向内具有浸染状矿石—网脉状矿石—块状矿石的分带特征。矿床地质特征和矿化分带特征形成特定的磁、电综合地球物理异常特征,结合成矿地质特征和综合地球物理特征,有利于该类型大型隐伏矿床的勘查发现。 |
| 英文摘要: |
| The Cerro Iman-Cerro Lunar-Cerro Nortes magnetite deposits located in the central-northern Chile, occurs in the northern section of the Cretaceous Chilean iron deposit belt along the coastal cordillera of Chile,the formation of magnetite deposits are related to the early structural extension of Andean tectonic cycle (Jurassic-Early Cretaceous) and associated with andesite rocks of the calc alkaline magmatic arc environment. Intensive hydrothermal activity accompanies magnetic mineralization, and the massive, stockwork, disseminated magnetite orebody and hydrothermal breccia and wallrock alteration were formed. Apparent mineral and geochemical zoning pattern exists from the iron orebody to the country rock. Intense actinolitization occurs in the internal zone nearby the orebody and albitization followed outwards. The silicification and tourmalinization in the external zone superimposed on the actinolitization and albitization. The iron orebodies displays the zoning characteristics from internal to external zone, i.e., from massive ore type to stockwork type and then disseminated ore type. Geological characteristics and mineralization zoning of the deposit will result in integrated geophysical anomalies of magnetic and electric resistance. The combination of geological characteristics integrated geophysical characteristics of the deposit will lead to the discovery of the large scale concealed iron deposits in this area. |
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