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首页> 外文学位 >Samarium-neodymium isotopic and whole-rock chemical compositions of late Neoproterozoic and Cambrian sedimentary and metasedimentary rocks of the Caledonian Highlands, southern New Brunswick.
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Samarium-neodymium isotopic and whole-rock chemical compositions of late Neoproterozoic and Cambrian sedimentary and metasedimentary rocks of the Caledonian Highlands, southern New Brunswick.

机译：新不伦瑞克省南部加里东高地的新元古代晚期和寒武纪沉积和准沉积沉积岩的mar钕同位素和全岩化学成分。

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摘要

Neoproterozoic though Cambrian clastic sedimentary and/or metasedimentary rocks occur in the Hammondvale Metamorphic Suite (> ca. 620 Ma) and Broad River (ca. 620 Ma), Coldbrook (ca. 560-542 Ma) and Saint John (ca. 540-490 Ma) groups in the Avalonian Caledonia terrane of southern New Brunswick. This study of the petrography, major and trace element chemistry and Sm-Nd isotopic composition provides new constraints on the provenance and environment of deposition of these units and hence on the tectonic evolution of this typical part of Avalonia.;Nd isotopic and whole-rock chemical data show that the Hammondvale Metamorphic Suite and metasedimentary rocks of the Broad River Group have negative &egr; Nd(T) values and were derived from recycled sedimentary and mafic igneous sources whereas the sedimentary rocks of the Coldbrook Group show generally positive &egr;Nd(T) values and likely were derived from Avalonian felsic to mafic igneous sources. Samples from the Saint John Group also have felsic to mafic igneous sources, but are characterized by negative &egr; Nd(T) values. Some metasedimentary rock samples from the Hammondvale Metamorphic Suite, Broad River Group and Saint John Group fall outside the Avalonian igneous isotopic window, whereas Coldbrook Group samples fall mainly in the Avalonian isotopic window, suggesting a substantial Avalonian crustal component for the Coldbrook Group. Sedimentary units in the Coldbrook Group were likely derived from igneous units in the Broad River and Coldbrook groups, based on their mostly positive &egr;Nd(T) values. The more negative &egr; Nd(T) values for samples from the Hammondvale Metamorphic Suite, Broad River Group and Saint John Group indicate a large, isotopically mature source, presumably outside Avalonia.
机译：新元古代至寒武纪碎屑沉积和/或沉积沉积岩发生在Hammondvale变质岩组（>约620 Ma）和Broad River（约620 Ma），Coldbrook（约560-542 Ma）和Saint John（约540- 490 Ma）群在新不伦瑞克省南部的阿瓦隆喀里多尼亚地层中。岩相学，主要元素和微量元素化学以及Sm-Nd同位素组成的研究为这些单元的物源和沉积环境提供了新的约束条件，因此也为该典型的Avalonia构造演化提供了新的限制。化学数据表明，宽河群的Hammondvale变质套件和沉积岩具有负的＆egr; Nd（T）值来自循环的沉积和镁铁质火成岩来源，而Coldbrook组的沉积岩通常显示正EegNd（T）值，并且可能源自阿瓦隆长英质至镁铁质火成岩来源。圣约翰集团的样品也有长原质至镁铁质火成岩，但其特征是负的＆egr;。 Nd（T）值。 Hammondvale变质套件，Broad River组和Saint John组的一些沉积沉积岩样品落在Avalonian火成岩同位素窗口之外，而Coldbrook Group样品主要落在Avalonian同位素窗口内，表明Coldbrook组有大量的Avalonian地壳成分。基于其大部分为正Nd（T）值，Coldbrook组的沉积单元很可能来自Broad River和Coldbrook组的火成岩单元。负数更多Hammondvale变质套件，Broad River组和Saint John组的样品的Nd（T）值表明存在大量同位素成熟的来源，大概是在Avalonia以外。

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  • 作者

    Satkoski, Aaron.;

  • 作者单位

    Acadia University (Canada).;

  • 授予单位 Acadia University (Canada).;
  • 学科 Geology.;Geochemistry.
  • 学位 M.Sc.
  • 年度 2008
  • 页码 150 p.
  • 总页数 150
  • 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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