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首页> 外文学位 >Geology, geochemistry, and geochronology of the Dufault, Seguin, and Horseshoe gabbroic-dioritic intrusions, Blake River Group (2704-2695 Ma), Abitibi Subprovince, Quebec.
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Geology, geochemistry, and geochronology of the Dufault, Seguin, and Horseshoe gabbroic-dioritic intrusions, Blake River Group (2704-2695 Ma), Abitibi Subprovince, Quebec.

机译：魁北克省阿比提比省布莱克河群（2704-2695 Ma）的Dufault，Seguin和Horseshoe辉长岩-闪长岩侵入体的地质，地球化学和年代学。

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摘要

Mafic to intermediate magmatism in the Blake River Group is represented in part by a large number of syn- to post-volcanic intrusions. These intrusions are commonly emplaced along pre-existing structures that formed as a result of regional tectonism, synvolcanic subsidence events, or other synvolcanic processes. Some mafic to intermediate intrusions of the Blake River Group are thought to have filled caldera structures which may be related to VMS mineralisation, having served as conduits for mineralizing fluids.;There was no evidence that any of these intrusions were emplaced along caldera-related structures or are related to VMS mineralisation. Collectively, the different compositions and ages of mafic intrusions in the Blake River Group indicate that they are the product of multiple episodes of mafic magmatism and only some, that have yet to be clearly identified, were emplaced into and therefore define synvolcanic subsidence structures.;Three gabbroic-dioritic intrusions (Dufault, Seguin, and Horseshoe) previously interpreted as synvolcanic were selected for study as they are representative of the range in intrusive styles and compositions, therefore providing insights into the evolution of the Blake River Group. The results indentify at least two episodes of mafic magmatism in the Blake River Group: an earlier phase of intrusion contemporaneous with volcanism and hydrothermal activity (∼2698 Ma; Dufault, Seguin Gabbros) and thus related to synvolcanic structures, and a later, post-folding phase of intrusion (Horseshoe Gabbro) that was emplaced along later structures and is unrelated to Blake River Group volcanism (ending 2695 Ma). All of these intrusions display internal differentiation that had not been previously described. The Dufault Gabbro is a concordant, multiphase intrusion that contains predominantly tholeiitic rocks and displays a progression of composition and texture from an earlier phase to a later phase. The Seguin Gabbro is a discordant intrusion emplaced along a reverse fault containing predominantly tholeiitic gabbro and leucogabbro. The Horseshoe gabbro is a discordant intrusion dominated by tholeiitic gabbroic phases that display layering defined by variation in oxide mineral contents. The dyke has been emplaced by the intrusion of multiple batches of magma.
机译：布莱克河群的基性岩浆到中等岩浆作用部分由大量的同火山活动到后火山岩入侵所代表。这些入侵通常沿着因区域构造，同火山作用下陷事件或其他同火山作用过程形成的既有结构而发生。布雷克河群的一些黑云母到中等侵入体被认为充满了可能与VMS矿化有关的破火山口结构，曾作为矿化流体的管道。;没有证据表明这些侵入中的任何一个都沿着与破火山口有关的结构发生或与VMS矿化有关。总的来说，布莱克河群中镁铁质侵入体的组成和年龄不同，表明它们是镁铁质岩浆作用多次发作的产物，只有一些尚未明确识别的岩浆被放入并定义了同火山作用下沉结构。选择了三个以前解释为同火山作用的辉长岩-二叠纪侵入岩（Dufault，Seguin和Horseshoe）进行研究，因为它们代表了侵入式样式和成分的范围，因此提供了对布雷克河群演化的见识。结果表明，布雷克河群至少发生了两次镁铁质岩浆作用：与火山作用和热液活动同时发生的入侵较早阶段（〜2698 Ma； Dufault，Seguin Gabbros），因此与同火山构造有关，后来又发生了侵入阶段的折叠阶段（Horseshoe Gabbro）沿后来的结构放置，与布莱克河群火山活动（至2695 Ma）无关。所有这些入侵都显示出内部差异，而以前没有进行过描述。 Dufault Gabbro是一种协调一致的多相侵入岩，主要含有高渗岩石，并且显示出成分和质地从早期到后期的变化。 Seguin Gabbro是沿逆断层侵入的不协调侵入带，主要包含高生辉长辉长岩和leucogabbro。 Horseshoe长辉石是不相容的侵入岩，由高辉长辉石相占主导地位，显示出由氧化物矿物质含量的变化所定义的分层。堤防被多批岩浆侵入所侵害。

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  • 作者

    Kuiper, Diana.;

  • 作者单位

    Laurentian University (Canada).;

  • 授予单位 Laurentian University (Canada).;
  • 学科 Geology.;Geochemistry.
  • 学位 M.Sc.
  • 年度 2011
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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