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首页> 外文学位 >Structure, metamorphism, and tectonism in the Soards Creek area, British Columbia.
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Structure, metamorphism, and tectonism in the Soards Creek area, British Columbia.

机译：不列颠哥伦比亚省Soards Creek地区的结构，变质作用和构造作用。

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摘要

Rocks of the Neoproterozoic Horsethief Creek Group in the northern Monashee Mountains, southeastern British Columbia, have been exposed to P-T conditions up to 8 kbar and 750°C in the muscovite-out zone south of Soards Creek. Structural, stratigraphic, and metamorphic continuity has been established between the northern Monashee Mountains and the Selkirks to the east (Simony et al. 1980) and the Cariboos to the west (Pell and Simony 1987); this region is referred to as the Selkirk-Monashee-Cariboo Metamorphic Complex (SMC). This study verifies geologic continuity across the Columbia River at Mica Creek, and presents a reinterpretation of the Scrip Nappe (Raeside and Simony 1983), using new field data.;Recent work (e.g. Digel et al. 1998, Crowley et al. 2000, Gibson et al. 2005, Ghent and Villeneuve 2006) has revealed that metamorphic events occurred at 150-170 Ma, 120-135 Ma, 90-100 Ma, and 60-70 Ma. These events are not equally apparent in all parts of the SMC. Late Jurassic garnet grade metamorphism, preserved in the Encampment Creek area, was overprinted by Early Cretaceous kyanite-staurolite, kyanite, and sillimanite grade metamorphism, followed by middle-Cretaceous kyanite to sillimanite grade metamorphism south of Mica Creek. The "thermal front" of middle-Cretaceous metamorphism is likely within the kyanite-sillimanite zone in the Soards Creek area. A Paleocene thermal event introduced "pod sillimanite" west of the study area (Digel et al. 1998). These thermal events appear to have encroached on the region from the south and west. The heat source for these overprints is not yet known. Late-Paleocene to Early-Eocene uplift was likely related to thrusting on the underlying detachment surface; D3 buckle folds developed syn-tectonically.
机译：位于不列颠哥伦比亚省东南部莫纳什山北部的新元古代horsethief溪群的岩石在Soards Creek南部的白云母外露带中暴露于高达8 kbar和750°C的PT条件下。在北部的莫纳西山脉和东部的西尔基克山脉之间（Simony et al。1980）和西部的Cariboos（Pell and Simony 1987）之间已经建立了结构，地层和变质的连续性。该区域称为Selkirk-Monashee-Cariboo变质复合体（SMC）。这项研究验证了云母河沿哥伦比亚河的地质连续性，并使用新的野外数据重新解释了斯克里普纳普河（Raeside和Simony 1983）；最近的工作（例如Digel等，1998； Crowley等，2000； Gibson et al。2005，Ghent and Villeneuve 2006）揭示了变质事件发生在150-170 Ma，120-135 Ma，90-100 Ma和60-70 Ma。这些事件并非在SMC的所有部分中都同样明显。保留在Encampment Creek地区的晚侏罗世石榴石等级变质被早白垩世蓝晶石-十字沸石，蓝晶石和硅线石等级变质所套印，随后是白云岩中蓝晶石到云母溪以南的硅线石等级变质。中白垩纪变质的“热锋”很可能在Soards Creek地区的蓝晶石-硅线石带内。一个古新世的热事件在研究区以西引入了“ pod硅线石”（Digel等，1998）。这些热事件似乎从南部和西部侵蚀了该地区。这些叠印的热源还未知。古新世晚期至新世早期隆升可能与下伏脱离面的逆冲有关。 D3带扣折痕是同构发展的。

著录项

  • 作者

    Spray, Graham.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Geology.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 237 p.
  • 总页数 237
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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