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首页> 外文学位 >Sedimentology and sequence stratigraphy of the ordovician Black River and lower Trenton Groups, Lake Simcoe area, Ontario.
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Sedimentology and sequence stratigraphy of the ordovician Black River and lower Trenton Groups, Lake Simcoe area, Ontario.

机译：安大略省辛科湖地区奥陶纪黑河和特伦顿河下游群的沉积学和层序地层学。

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摘要

The Black River and Trenton Limestone Groups of southern Ontario are a relatively thin (average 150 metres) carbonate succession in the Lake Simcoe area, resting unconformably on Precambrian basement. Local Precambrian ‘highs’ complicate the overall facies pattern and lithofacies patterns define local shoal, intershoal and basinal environments.; Detailed microfacies and facies analysis in large quarries in the Lake Simcoe area are used to infer various carbonate environments by comparison with analogous modern and ancient ramps. Fifteen microfacies are grouped into six microfacies associations based on composition, grain size and texture. Relative energy levels, and depositional environments for these are then inferred. These environments resemble the Recent Arabian Shelf of the Persian Gulf for the Black River Group, and the Recent West Florida Shelf for the Trenton, though other Recent ramps like South Australia are also comparable.; The vertical arrangement of facies in the Lake Simcoe area form repetitive cycles which can then be traced laterally into adjacent areas, complicated by the effects of sea-floor topography and possibly by synsedimentary faulting. Both minor and major cycles are dominantly coarsening upwards, and normally bounded by sharp non-depositional surfaces representing marine transgressions. Both minor and major cycles are compared to those of other ancient successions, and those inferred from cores in the modern ramps used for the microfacies and facies comparison. Their development can be related to both autocylic and allocyclic processes.; The facies architecture of the cycles across southern Ontario show that they are the basic architectural elements of the Black River-Trenton transgressive systems tract. The major cycles form five backstepping parasequences extending across southern Ontario from Manitoulin Island to Kingston. Periodic uplift and subsidence of the area, fluctuation in the position of the relative sea level, local tectonism, and sea-water temperatures were responsible for development of the succession.
机译：安大略省南部的黑河和特伦顿石灰岩群是在西姆科湖地区相对稀薄的碳酸盐岩层系（平均150米），不整合地沉积在前寒武纪基底上。局部前寒武纪的“高”复杂化了整体相的格局，岩相格局界定了局部浅滩，浅滩间和盆地环境。通过与类似的现代坡道和古代坡道相比较，在Simcoe湖地区的大型采石场中进行了详细的微相和相分析，从而推断出各种碳酸盐环境。根据成分，晶粒大小和质地，将十五个微相分为六个微相关联。然后推断出它们的相对能级和沉积环境。这些环境类似于黑河集团的波斯湾的最近阿拉伯大陆架和特伦顿的最​​近的西佛罗里达大陆架，尽管南澳大利亚等其他近代斜坡也具有可比性。西姆科湖地区相的垂直排列形成了重复的循环，然后可以横向追溯到相邻的区域，这受到海底地形的影响以及同沉积的断裂作用的影响。次要周期和主要周期都主要向上粗化，并且通常以代表海洋侵害的尖锐的非沉积表面为界。将次要和主要循环与其他古代演替的循环进行比较，并从用于微相和相比较的现代斜坡的岩心中推断出这些循环。它们的发展可能与自体循环过程和异环过程相关。横跨安大略省南部的自行车的相结构表明，它们是黑河-特伦顿海侵系统道的基本建筑元素。主要周期形成了五个后退副序列，从马尼托林岛到金斯敦横跨安大略省南部。该区域的周期性隆升和沉陷，相对海平面的位置波动，局部构造和海水温度是造成该演替发展的原因。

著录项

  • 作者

    El Gadi, Muftah Saleh.;

  • 作者单位

    University of Guelph (Canada).;

  • 授予单位 University of Guelph (Canada).;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 427 p.
  • 总页数 427
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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