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Nature and Distribution of Gibbsite in Some Western Australian Iron Ores

机译：西澳大利亚一些铁矿石中菱铁矿的性质和分布

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Work to date has shown that the use of Al2O3:SiO2 ratios is suitable for identifying potentialrngibbsite bearing samples. Subsequent confi rmatory XRD analysis helps to refi ne this initialrnidentifi cation. Based on these methods, gibbsite has been mapped in two common settings:rn1. along steeply dipping faults, orrn2. in association with stratigraphic contacts where one unit is aluminous (eg dolerite dyke).rnOn a microscale, the samples studied illustrate an association between haematite, and to a lesserrnextent goethite, and gibbsite. In these samples the dominant forms of haematite are discreterncrystalline phases of either microplaty haematite or euhedral martite. Two dominant forms ofrngibbsite were observed:rn1. vein style gibbsite that cross-cuts (or infi ll's cracks) in goethite ± martite iron oxidernassociations, orrn2. gibbsite intimately intergrown with and forming a matrix to microplaty haematite.rnSome of the gibbsite microstructures observed suggest that it may have formed during a veryrnhydrous, possibly hypogene, stage of the deposit genesis. The presence of this crystalline gibbsite,rnand in particular its occasionally euhedral form, suggests that aluminium was at some stagernremobilised, at least locally, and then precipitated from solution as gibbsite. These observationsrnsuggest that these has been a phase of gibbsite precipitation that may have had a close but complexrnrelationship with regards to the timing of the mineralisation processes, rather than formation as arnresult of late stage lateritic weathering.
机译：迄今为止的工作表明，使用Al2O3：SiO2的比例适合于鉴定潜在的含三水铝石的样品。随后的确认XRD分析有助于确定该初始标识。基于这些方法，已将gibbsite映射到两个常用设置中：rn1。沿陡倾断层orrn2。与一个单元是铝质的地层接触（例如，白云石堤）有关。在微观尺度上，所研究的样品说明了赤铁矿和含量较低的针铁矿与三水铝石之间的联系。在这些样品中，赤铁矿的主要形式是微片状赤铁矿或全金属马氏体的离散晶相。观察到两种主要形式的菱锰矿：rn1。在针铁矿– martite氧化铁纳米复合体orrn2中横切（或裂缝裂缝）的脉状菱铁矿。三水铝石与微片状赤铁矿紧密共生并形成基质。rn观察到的三水铝石微结构表明，它可能是在矿床成矿的非常含水的，可能是次生的阶段形成的。这种结晶性三水铝石的存在，特别是其偶尔的正面体形式，表明铝在某个阶段至少部分地被重新固定，然后以三水铝石的形式从溶液中沉淀出来。这些观察结果表明，这是三水铝矿降水的一个阶段，可能与矿化过程的时间有密切而复杂的关系，而不是后期红土风化的结果。

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  • 来源
    《Iron ore 2011》|2011年|p.315-320|共6页
  • 会议地点 Perth(AU)
  • 作者

    M Paine; E Ryan; P Mackenzie;

  • 作者单位

    Material Characterisation Group, Rio Tinto Iron Ore, 152 - 158 St Georges Terrace, Perth WA 6000. Email: mark.paine@riotinto.com;

    Technology and Innovation, Rio Tinto, 1 Research Avenue, Bundoora Vic 3083. Email: esme.ryan@riotinto.com;

    Material Characterisation Group, Rio Tinto Iron Ore, 152 - 158 St Georges Terrace, Perth WA 6000. Email: patrick.mackenzie@riotinto.com;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
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