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首页> 外文期刊>Contributions to Mineralogy and Petrology >Magmatic zoning in apatite: a monitor of porosity and permeability change in granites
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Magmatic zoning in apatite: a monitor of porosity and permeability change in granites

机译：磷灰石岩浆分区：监测花岗岩孔隙度和渗透率的变化

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摘要

Apatites from the Shap Granite, northern England, are strongly zoned, reflecting multiple generations of growth and dissolution. Such chemical zoning is most readily displayed in cathodoluminescence images and correlates well with trace element variation determined using LA-ICP-MS analyses. The zoned apatites provide a detailed record of the changing scales of permeability during progressive crystallisation within the magma chamber. Early periods of apatite growth are preserved within cores and represent both early growth within a magma chamber dominated by vigorous mixing processes and inherited grains with significantly different chemistries. The main phase of apatite growth within the magma was strongly controlled by the presence of adjacent biotite phenocrysts and is characterised by fine scale oscillatory zoning, followed by the growth of a thin rim of relatively uniform composition. The chemical evolution of the later phases of apatite growth and the stratigraphy of the zoning appear to record late stage crystallisation within progressively more isolated interstitial melt pockets.
机译：来自英格兰北部Shap Granite的磷灰石被强烈划分，反映了多代的生长和溶解。这种化学分区最容易显示在阴极发光图像中，并且与使用LA-ICP-MS分析确定的痕量元素变化密切相关。分区磷灰石提供了岩浆室内渐进结晶过程中渗透率变化尺度的详细记录。磷灰石的早期生长被保存在岩心中，既代表了在岩浆室内的早期生长，该岩浆室内以剧烈的混合过程为主，也继承了化学性质明显不同的晶粒。岩浆内磷灰石生长的主要阶段受到相邻黑云母隐晶的存在的强烈控制，其特征是精细的振荡带，随后是组成相对均匀的薄边缘的生长。磷灰石生长后期和地层分层的化学演化似乎记录了在逐渐分离的间隙熔体口袋中的后期结晶。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2003年第5期|568-577|共10页
  • 作者

    T. J. Dempster; M. Jolivet; M. N. Tubrett; C. J. R. Braithwaite;

  • 作者单位

    Division of Earth Sciences (CRUST project) University of Glasgow;

    Division of Earth Sciences (CRUST project) University of GlasgowUMR.5573 Geophysics. Tectonics and. Sedimentology .Cc.060 Universite Montpellier II;

    Department of Earth Sciences Memorial University of Newfoundland;

    Division of Earth Sciences (CRUST project) University of Glasgow;

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