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首页> 外文学位 >Organic petrology and depositional environments of the Souris Lignite, Ravenscrag Formation (Palaeocene), southern Saskatchewan, Canada.
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Organic petrology and depositional environments of the Souris Lignite, Ravenscrag Formation (Palaeocene), southern Saskatchewan, Canada.

机译：Souris褐煤的有机岩石学和沉积环境，加拿大萨斯喀彻温省南部的拉文斯克格组（古新世）。

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摘要

Various coal petrographic models exist, which suggest to be able to reconstruct the nature of the ancient peat-forming environment. In order to test the validity of these models, the Palaeocene Souris Lignite of south-eastern Saskatchewan was chosen for a study in which the depositional environments and vegetation as derived from these various models, was compared with the palaeoenvironment and vegetation as determined by petrography, palynology and selected chemical trends.; Analysis of the Souris lignite reveals an idealised mire succession of:; cwl="32:228" ncols="2" wdm="100" dispwid="5.77in"> row> cell chj="c">top cell chj="l">C - Gymnosperm (Taxodium) forest mire row> cell chj="c">↑ cell chj="l">H - Mixed angiosperm/gymnosperm forest mire row> cell chj="c">↑ cell chj="l">G - Angiosperm forest mire row> cell chj="c">↑ cell chj="l">E - Dry Fern mire row> cell chj="c">↑ cell chj="l">D - Wet Fern mire row> cell chj="c">↑ cell chj="l">A - Fern/Burr-reed fen row> cell chj="c">base cell chj="l">L - Algae dominated mire ; The principle factor driving the idealised succession is decreasing water depth within the peat-forming environment (terrestrialisation), which causes a change in the characteristic mire vegetation from: Algae→Ferns→Angiosperms→Gymnosperms. The application of previously published petrographic models to the Souris seam reveals that none of the models examined in this study adequately describes the Souris seam.; The main reasons for the failure of the models are ascribed to: (1) Over-simplification of the effects of humification on tissue preservation. (2) The lack of distinction made by some models between the different inertinite macerals and their modes of formation. (3) The inability to recognise rheotrophic mires with low mineral matter contents. (4) The use of post diagenetic processes (e.g. geochemical gelification) in determining depositional environments. (5) Changes in petrographic composition related to floral evolution, geological age, rank increase, and compaction.; While the relationship between petrographic composition and palynology on an individual sample basis is poor, the use of mean petrographic compositions for each mire type (L, A, D, E, G, H, C) does reveal trends in some models which are related to the idealised mire succession. This phenomenon reflects the reduction in the resolution level of the petrographic composition caused by the calculation of mean compositional values.; The sample preparation and preservation techniques developed in this study have proven satisfactory in limiting sample desiccation while still allowing standard polishing and reflected light microscopy techniques, as employed in coal petrographic analyses, to be performed.
机译：存在各种煤岩学模型，这表明它们能够重建古代泥炭形成环境的性质。为了检验这些模型的有效性，我们选择了萨斯喀彻温省东南部的古新世苏里斯褐煤进行研究，并将这些模型得出的沉积环境和植被与通过岩相学确定的古环境和植被进行了比较，孢粉学和某些化学趋势。对苏里斯褐煤的分析显示出： cwl =“ 32：228” ncols =“ 2” wdm =“ 100” dispwid =“ 5.77in”> <行规则rty =“。”> row> cell chj =“ c“>顶部 cell chj =” l“> C-裸子植物（ Taxodium ）森林沼泽 row> cell chj =“ c”>↑ cell chj =“ l“> H-被子植物/裸子植物混合森林泥泞 row> cell chj = “ c”>↑ cell chj =“ l”> G-被子植物森林泥沼 row> cell chj =“ c”>↑ cell chj =“ l”> E-干蕨泥沼< / tablecell> row> cell chj =“ c”>↑ cell chj =“ l”> D-湿蕨泥潭 row> cell chj =“ c”>↑ cell chj =“ l”> A-蕨/伯德·里德·芬 row> cell chj =” c“> base cell chj =” l“> L-藻类主导的泥潭 驱动理想演替的主要因素是减少泥炭形成环境中的水深（陆地化），这会导致特征性泥潭植被的变化： Algae→Ferns→被子植物→子实体植物。 先前发表的岩相学模型在苏里斯煤层中的应用表明，该研究中没有一个模型能够充分描述苏里斯煤层。模型失败的主要原因归因于：（1）过度简化了腐殖化对组织保存的影响。 （2）某些模型缺乏对惰质微晶石及其形成方式的区分。 （3）无法识别出矿物质含量低的营养型泥潭。 （4）在确定沉积环境中使用后成岩作用（例如地球化学凝胶化）。 （5）岩石学组成的变化与花卉演化，地质年龄，等级增加和压实有关;虽然以单个样本为基础的岩相组成与孢粉学之间的关系很差，但每种泥潭类型（L，A，D，E，G，H，C）的平均岩相组成的使用确实揭示了一些相关模型的趋势理想的泥潭继承。这种现象反映了由平均组成值的计算引起的岩石组成分辨率水平的降低。在这项研究中开发的样品制备和保存技术已证明在限制样品干燥方面令人满意，同时仍允许执行煤岩学分析中所采用的标准抛光和反射光显微镜技术。

著录项

  • 作者

    Frank, Michael Clay.;

  • 作者单位

    The University of Regina (Canada).;

  • 授予单位 The University of Regina (Canada).;
  • 学科 Paleoecology.; Geology.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 387 p.
  • 总页数 387
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;地质学;
  • 关键词

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