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首页> 外文会议>Iron ore 2011 >Microplaty Haematite of the High-Grade Iron Ores – Its Nature and Genesis
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Microplaty Haematite of the High-Grade Iron Ores – Its Nature and Genesis

机译：高品位铁矿微片赤铁矿的性质与成因

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摘要

Secondary microplaty haematite in its variety of styles and generations is the defi ning componentrnof the high-grade banded iron-formation (BIF)-hosted iron ores of the world that are dominatedrnby martite (M; - haematite pseudomorphs after magnetite). The term microplaty haematitern(mplH) was introduced during the CSIRO-AMIRA 1976-1994 iron ore program, and was usedrnto differentiate the then main export martite-microplaty haematite (M-mpl H) ore types of TomrnPrice-Whaleback and Paraburdoo (Paleoproterozoic), from the newly exploited, more prolifi crnsupergene martite-goethite (M-G) ores (Mesozoic-Paleocene) of the Hamersley Province that arernnow the major Hamersley iron ore exports.rnMorris (1980, 1985) suggested that the most important genetic factor that distinguishes therntwo main ore types was regional metamorphism of Paleoproterozoic M-G ores at temperaturesrnnormally related to diagenesis (ca 80 - 100℃). As temperatures increased, mplH grew in goethiternboth spontaneously as well as by nucleating on martite and other pre-existing haematite. Becausernthe conversion of goethite to haematite involves a ~27 per cent reduction in volume, the crystalsrnprobably grew within microvoids of their own creation, with iron transfer through water resultingrnfrom the process itself, a local hydrothermal process requiring no introduced hypogene fl uids.rnBarley et al (1999) and Taylor et al (2001) concluded instead that oxidation of introducedrnsiderite in hydrothermally metasomatised BIF 'protore' resulted in mplH + ankerite by reactionrnwith heated meteoric fl uids. This postulated 'protore', still preserved locally at Mt Tom Price, wasrndescribed during the CSIRO-AMIRA program as local post-ore BIF metasomatic residuals. Thesernnew hypogene-meteoric concepts for M-mpl H genesis have formed the basis for a range of varyingrnlocal and international models that currently dominate the literature of iron ore.rnNo valid petrographic data supporting the hypogene-supergene modelling was found butrnpetrographic images of goethite-related mplH growth in a range of different environments arernshown.
机译：次要的微型板状赤铁矿是世界上由高级带状铁矿（BIF）承载的铁矿的定义成分，这些铁矿以马氏体（M;-磁铁矿后的赤铁矿假晶体）为主。在CSIRO-AMIRA 1976-1994铁矿石计划期间引入了术语“微型板状生铁矿（mplH）”，用于区分当时主要的出口马蒂特-微型板状赤铁矿（M-mpl H）矿石类型的TomrnPrice-Whaleback和Paraburdoo（古生代）莫里斯（1980，1985）提出了区别于哈默斯利铁矿主要出口来源的哈默斯利省新近开发的，多产的超天然马氏体-针铁矿（MG）矿石（中生代-古新世）。主要矿石类型为古元古代MG矿石在与成岩作用成正相关的温度下（约80-100℃）的区域变质作用。随着温度的升高，mplH会自发地在针铁矿中生长，并且会在马氏体和其他先前存在的赤铁矿上成核。因为针铁矿向赤铁矿的转化减少了约27％的体积，所以晶体很可能在其自身产生的微孔中生长，并且铁本身是通过过程本身产生的水通过水转移的，这是不需要引入次生流体的局部水热过程.rn Barley等人（1999年）和泰勒等人（2001年）得出的结论是，在水热交联化的BIF“原型”中引入的菱铁矿的氧化通过与加热的陨石流体的反应导致了mplH +铁矿石。这个假设的“原型”仍然保存在汤姆·普赖斯山，在CSIRO-AMIRA计划中被描述为当地的矿石后BIF交代残基。这些用于M-mpl H生成的新的表观计量学概念已成为目前在铁矿石文献中占主导地位的一系列不同的本地和国际模型的基础。没有找到支持该表观超表层建模的有效岩相学数据显示了在不同环境中的mplH增长。

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  • 来源
    《Iron ore 2011》|2011年|p.117-124|共8页
  • 会议地点 Perth(AU)
  • 作者

    R C Morris;

  • 作者单位

    CSIRO Earth Science and Resource Engineering, ARRC, Kensington WA 6151. Email: richard.morris@csiro.au;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
  • 关键词

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