| 宁芜和庐枞火山岩盆地玢岩铁矿矿床地球化学特征及其成矿动力学背景探讨 |
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| 引用本文： | 陈津华,曾键年,王思源,李锦伟,邱金亮,张燕.宁芜和庐枞火山岩盆地玢岩铁矿矿床地球化学特征及其成矿动力学背景探讨[J].地质科技情报,2012,31(1):86-94. |
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| 作者姓名： | 陈津华 曾键年 王思源 李锦伟 邱金亮 张燕 |
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| 作者单位： | 1. 中国地质大学资源学院,武汉,430074
2. 中国地质调查局南京地质调查中心,南京,210016 |
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| 基金项目： | 中国地质调查局资源评价项目(1212010781014;1212010660404);中国地质大学地质过程与矿产资源国家重点实验室开放基金课题(MGMR2001-1) |
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| 摘 要： | 玢岩铁矿是我国铁矿的一个重要成矿类型,宁芜和庐枞火山岩盆地是长江中下游地区玢岩铁矿的主要矿集区.对宁芜和庐枞盆地的构造分析结果表明,NNE向断裂和NW向断裂控制了区内的岩浆活动,断裂的交汇部位往往是玢岩铁矿产出的有利空间.综合对比了宁芜和庐枞地区玢岩铁矿成矿岩体的主量元素、稀土元素以及铅同位素特征,表明其具有相似的地球化学特征和共同的物质来源.稀土元素特征表明两盆地玢岩铁矿的成矿物质主要来源于地幔或下地壳；Pb同位素特征则进一步说明其与EM-Ⅱ型富集地幔具有密切关系.宁芜和庐枞盆地在燕山期受太平洋板块俯冲作用的影响,成矿作用受岩浆活动所控制.两盆地玢岩铁矿成矿作用的差异,可能是由于其受地壳物质混染程度不同所致.
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| 关 键 词： | 地球动力学机制 成矿作用 成矿地球化学对比 玢岩铁矿 宁芜盆地 庐枞盆地 |
Characteristic of Deposit Geochemistry and Discussion with Metallogenic Dynamics Background of Porphyrite Iron in Ningwu and Luzong Volcanic Basins |
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| CHEN Jin-hua
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ZENG Jian-nian
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WANG Si-yuan
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LI Jin-wei
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QIU Jin-liang
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ZHANG Yan.Characteristic of Deposit Geochemistry and Discussion with Metallogenic Dynamics Background of Porphyrite Iron in Ningwu and Luzong Volcanic Basins[J].Geological Science and Technology Information,2012,31(1):86-94. |
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| Authors: | CHEN Jin-hua ZENG Jian-nian WANG Si-yuan LI Jin-wei QIU Jin-liang ZHANG Yan |
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| Institution: | 1.Faculty of Earth Resources,China Unversity of Geosciences,Wuhan 430074,China; 2.Nanjing Center of Geological Survey,CGS,Nanjing 210016,China) |
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| Abstract: | Porphyrite iron deposit is one of important deposit types in China.Ningwu and Luzong volcanic basins are the main ore districts in the middle and lower reaches of Yangtza River.The structure of Ningwu and Luzong basins is analyzed separately.It shows that NNE-trending faults and NW-trending faults control magmatism in the area and the intersections of fracture are often the favorable space for porphyrite iron deposits.Comprehensive comparison with major elements,rare earth elements and lead isotopes of ore rock,in Ningwu and Luzong area,shows that they have similar geochemical characteristics and common material source.The characteristics of REE show that the ore-forming materials of porphyrite iron deposits are mainly from lower crust or mantle,Pb isotopic characteristics further illustrate that the ore-forming materials are closely related with EM-Ⅱ mantle.Ningwu and Luzong basins were affected by the subduction of Pacific plate,and mineralization was controlled by magmatic activity.The difference in mineralization of porphyrite iron may be due to the different levels of contamination by crust. |
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| Keywords: | geodynamic mechanism mineralization geochemical comparison of ore-forming porphyrite iron deposit Ningwu Basin Luzong Basin |
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