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New structural, geochronological, and geochemical constraints on the tectonic assembly of the Archean Pickle Lake greenstone belt, Uchi subprovince, western Superior Province.

机译:优越地区西部乌奇省太古代的泡菜湖绿岩带构造组合对构造,地球年代和地球化学的新限制。

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摘要

New field work, U-Pb zircon ages, and geochemical data, including Sm-Nd isotopic analyses, have refined the timing and nature of volcanism, deformation, and tectonic assembly of the Pickle Lake greenstone belt in the Uchi subprovince of the western Superior Province of the Canadian Shield. Based on continuous stratigraphic marker units and geochemistry across a previously inferred fault contact, as well as pillow tops indicating consistent northwest-younging, the ca. 2890 Ma Pickle Crow assemblage has been redefined to include the former Northern Pickle assemblage. The Pickle Crow assemblage consists of tholeiitic basalt with thin, but laterally extensive, oxide-facies iron formation overlain by juvenile OIB-like basalts (i.e., niobium-enriched basalts) and minor calc-alkaline andesites to dacites (initial epsilonNd = +1.8--+2.2) suggestive of deposition in a sediment-starved oceanic basin. (Abstract shortened by UMI.)
机译:新的野外工作,U-Pb锆石年龄以及包括Sm-Nd同位素分析在内的地球化学数据,完善了优越西部西部上乌希府的Pickle Lake绿岩带的火山活动,变形和构造组装的时间和性质。加拿大盾牌。基于连续的地层标志物单元和先前推断的断层接触的地球化学,以及指示西北向一致的枕顶,ca。 2890年,Ma Pickle Crow组合被重新定义为包括以前的Northern Pickle组合。 Pickle Crow组合由可塑的玄武岩组成,其上有薄薄但横向广泛的氧化物相铁形成,上面覆盖着类似OIB的玄武岩(即富含铌的玄武岩)和次要的钙碱性安山岩至dacites(初始epsilonNd = + 1.8- -+ 2.2)表明在缺乏沉积物的海洋盆地中的沉积。 (摘要由UMI缩短。)

著录项

  • 作者

    Young, Michael Dylan.;

  • 作者单位

    Queen's University at Kingston (Canada).;

  • 授予单位 Queen's University at Kingston (Canada).;
  • 学科 Geology.
  • 学位 M.Sc.
  • 年度 2004
  • 页码 182 p.
  • 总页数 182
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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