| 澳大利亚西部哈默斯利铁成矿省BIF富铁矿的成矿特征与控矿因素 |
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| 引用本文： | 姚春彦,姚仲友,徐鸣,高卫华,李红军.澳大利亚西部哈默斯利铁成矿省BIF富铁矿的成矿特征与控矿因素[J].中国区域地质,2014(2):215-227. |
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| 作者姓名： | 姚春彦 姚仲友 徐鸣 高卫华 李红军 |
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| 作者单位： | 中国地质调查局南京地质调查中心,江苏南京210016 |
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| 基金项目： | 资助项目：中央地勘基金项目（编号：201130D06200123） |
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| 摘 要： | 澳大利亚西部哈默斯利铁成矿省含有世界级高品位的赤铁矿体。主要铁矿床包括芒特维尔贝克、汤姆普莱斯山、帕拉伯杜等，它们均产于元古宙早期布罗克曼BIF型含铁建造中。高品住铁矿体的空间分布明显受到元古宙区域隆起和拉张环境下形成的古老正断层系统的控制。该成矿省高品位铁矿层的形成可分为3个阶段：第1阶段为深层阶段，该阶段硅从含铁建造中淋滤出来，留下薄层状富含铁氧化物、碳酸盐岩、硅酸镁和磷灰石的残余物；第2阶段为深部大气水氧化阶段，该阶段含铁建造的磁铁矿-菱镁矿组合被氧化为赤铁矿-铁白云石，并以发育假象赤铁矿为特征；第3阶段为浅层风化作用。通过对成矿特征和成矿模式的总结，认为成矿时代、断层、褶皱等构造特征及流体和表生风化作用是富铁矿床形成的主要控矿因素。
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| 关 键 词： | 哈默斯利铁成矿省 BIF含铁建造 矿床成因模式 控矿因素 西澳 |
Metallogenic characteristics and ore-control factors of the high-grade BIF of the Hamersley iron province in western Australia |
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| YAO Chun-yan,YAO Zhong-you,Xu Ming,Gao Wei-hua,LI Hong-jun.Metallogenic characteristics and ore-control factors of the high-grade BIF of the Hamersley iron province in western Australia[J].Regional Geology of China,2014(2):215-227. |
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| Authors: | YAO Chun-yan YAO Zhong-you Xu Ming Gao Wei-hua LI Hong-jun |
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| Institution: | Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China |
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| Abstract: | The Hamersley iron province of Western Australia contains the world-class high-grade hematite deposits hosted within the Lower Proterozoic Brockrnan Iron Formation （BIF-type） in Mount Tom Price, Mount Whaleback, and Paraburdoo. Spatially, these deposits are structurally constrained by old normal fault systems formed during a period of major uplift and extension in Proterozoic. The formation of the Hamersley high-grade hematite deposits could be divided into three stages, i.e. the first stage or the hypogene metallogenic stage, during which silica was removed, leaving thinned residues rich in iron oxides, carbonates, magnesium silicates and apatite; the second deep meteoric stage, during which magnetite-siderite assemblage was oxidized into hematite-ankerite; the third stage or the supergene stage. Based on a discussion on the metallogenic characteristics and the ore genesis model, the authors have found that the ore-forming epochs, the tectonic characteristics such as faults and folds, fluids, and the supergene weathering constituted the main ore-control factors for the formation of the high-grade iron deposits. |
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| Keywords: | Hamersley iron province BIF formation ore genesis model ore-control factor western Australia |
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