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首页> 外文学位 >Geochemistry of the mafic and felsic norite in the Whistle Embayment: Implications for the crystallization history of the Sudbury Igneous Complex, Sudbury, Ontario.
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Geochemistry of the mafic and felsic norite in the Whistle Embayment: Implications for the crystallization history of the Sudbury Igneous Complex, Sudbury, Ontario.

机译：吹口哨中铁质和长质黑质岩的地球化学：对安大略省萨德伯里萨德伯里火成岩复合体结晶史的启示。

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摘要

The ore deposits of the 1.85 Ga Sudbury Structure collectively make up one of the largest Ni-Cu-PGE producing districts in the world.; The evolution of the Sudbury Igneous Complex (SIC) was modeled using the MELTS program and several geologically reasonable initial compositions, including quartz-rich norite, average offset quartz diorite, and average SIC. The average SIC composition, which is very similar to the average offset quartz diorite compositions, appears to be the best estimate of the initial magma composition, providing the best fit to the volumes and cumulus mineralogy of each of the units within the SIC. The MELTS models suggest that the mafic norite, norite, and quartz gabbro are cumulates, whereas the granophyre appears to represent a residual liquid that crystallized downward from the roof. The composition of the norite in the lower portion of the SIC appears to match the composition of the cumulate rocks produced in an equilibrium crystallization model, whereas the compositions of the quartz gabbro and granophyre appear to match the compositions of the cumulate rocks and residual liquids produced in a fractional crystallization model. This suggests that the style of crystallization may have changed from dominantly equilibrium crystallization to dominantly fractional crystallization during the crystallization history of the SIC. (Abstract shortened by UMI.)
机译：1.85 Ga Sudbury结构的矿床共同构成了世界上最大的Ni-Cu-PGE生产区之一。 Sudbury火成岩（SIC）的演化是使用MELTS程序和几个地质上合理的初始组成模拟的，包括富含石英的Norite，平均偏移石英的diodio和平均SIC。平均SIC组成与平均偏移石英闪长岩的组成非常相似，似乎是初始岩浆组成的最佳估计，为SIC中每个单元的体积和积云矿物学提供了最佳拟合。 MELTS模型表明，镁铁质的黑色矿，黑色矿和石英辉长岩是累积的，而花岗石似乎代表了从屋顶向下结晶的残留液体。 SIC下部的诺氏岩成分似乎与在平衡结晶模型中产生的累积岩石的成分相匹配，而石英辉长岩和粒晶的成分似乎与累积的岩石和残留液体的成分相匹配在分数结晶模型中。这表明在SIC的结晶过程中，结晶方式可能已从占主导的平衡结晶转变为占主导的分步结晶。 （摘要由UMI缩短。）

著录项

  • 作者

    Dessureau, Gilles.;

  • 作者单位

    Laurentian University of Sudbury (Canada).;

  • 授予单位 Laurentian University of Sudbury (Canada).;
  • 学科 Geology.; Geochemistry.
  • 学位 M.Sc.
  • 年度 2003
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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