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首页> 外文学位 >Structure, metamorphism and tectonic setting of metasedimentary rocks and mafic-ultramafic inclusions in the Dashwoods subzone of the Dunnage zone, southwestern Newfoundland.
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Structure, metamorphism and tectonic setting of metasedimentary rocks and mafic-ultramafic inclusions in the Dashwoods subzone of the Dunnage zone, southwestern Newfoundland.

机译：纽芬兰西南部Dunnage地带Dashwoods地带的准沉积岩和镁铁质-超镁铁质包裹体的结构，变质作用和构造环境。

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摘要

This study focuses on an area east of the Long Range Fault, on the western side of the Dashwoods subzone and contains all the major lithostratigraphic units characteristic of the Dashwoods subzone.;An upper age of deposition of the metasediments is approximately middle Ordovician as constrained by the age of the granitoid rocks. Silurian mafic bodies in the Dashwoods subzone have not been affected by high grade metamorphism or high degree of deformation and the Dashwoods subzone had probably stabilized by late Ordovician to Silurian time. (Abstract shortened by UMI.).;Metasedimentary rocks are separated into two main units: metapsammites to the west and metapelites to the east. Mafic-ultramafic inclusions lie within shear zones in the metapelites and are interpreted to represent parts of a disrupted ophiolite suite. The mafic-ultramafic rocks are interpreted to have undergone the full range of metamorphism and deformation that has affected the metasedimentary rocks. Geothermobarometry calculations suggest that the higher grade metamorphic event may have reached temperatures in the order of 800
机译：这项研究的重点是达什伍德斯分区西侧的长断层以东地区，包含达什伍德斯分区的所有主要岩性地层学单元。沉积物的沉积年龄大约是中奥陶纪，受其约束。花岗岩岩石的年龄。达什伍德次区域的志留系镁铁质体不受高变质作用或高度变形的影响，达什伍德次区域可能已由奥陶纪晚期至志留纪时期稳定下来。 （摘要由UMI缩短。）；沉积岩分为两个主要单元：西部的准am酰胺和东部的准橄榄岩。镁铁质-超镁铁质包裹体位于变质岩的剪切带内，并被解释为代表了蛇绿岩组的一部分。镁铁质-超镁铁质岩石被解释为经历了影响变质沉积岩的全部变质作用和变形。地热气压法计算表明，较高品位的变质事件可能达到了800量级的温度。

著录项

  • 作者

    Fox, Don.;

  • 作者单位

    Memorial University of Newfoundland (Canada).;

  • 授予单位 Memorial University of Newfoundland (Canada).;
  • 学科 Geology.
  • 学位 M.Sc.
  • 年度 1992
  • 页码 282 p.
  • 总页数 282
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 普通生物学;
  • 关键词

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