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首页> 外文学位 >Identification and characterization of the middle devonian portwood member of the new Albany shale in the Appalachian and Illinois basins.
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Identification and characterization of the middle devonian portwood member of the new Albany shale in the Appalachian and Illinois basins.

机译：阿巴拉契亚盆地和伊利诺伊盆地新奥尔巴尼页岩中泥盆纪波特伍德中段的识别和特征。

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摘要

The Middle Devonian Portwood Member of the New Albany Shale largely consists of dark grey to black dolomitic shale intervals with prominent interbeds of tan weathering dolomite. It shows thin layers and laminae of dolosiltite, and displays soft sediment deformation at multiple scales. A recent exposure of rocks with Portwood characteristics located in the Illinois Basin has been examined at the shores of Barren Lake, Kentucky. Due to lack of rare correlative fossils in the Portwood, hand specimens and thin sections from Barren River Lake were compared with a collection of samples from the type area in central Kentucky. Lithologically the Barren River Lake samples are a close match with Portwood samples from central Kentucky and differ significantly with regard to carbonate content (higher), sedimentary features (thickness of dolosiltite beds, soft sediment deformation), and provenance (more plutonic quartz) from the Trousdale Member. Middle to Late Devonian black shales of the Appalachian and Illinois Basins contain prominent amounts of silt-sized quartz. Quartz is abundant in many mudstones and can be derived from terriginous clastic or authigenic sources. Detrital quartz was used to gauge provenance by scanning with an electron microscope (SEM) using backscatter (BSE) and cathodoluminescence (CL) techniques. Significant differences were observed in amounts of plutonic and high-grade metamorphic quartz vs. low-grade metamorphic quartz between samples from the Blocher (Trousdale equivalent) and the Portwood Members of the New Albany Shale. Both contain low-grade metamorphic quartz along with authigenic quartz; however, the Portwood contains elevated amounts of igneous quartz determined by using cathodoluminescence. Where described in east-central Kentucky, the Portwood shows high lateral variability in thickness, and consists of several erosion bounded depositional sequences. The Barren River Lake locality, and any Portwood equivalents west of the Cincinnati Arch, suggest that during the Givetian the Cincinnati Arch was not an active tectonic element. Previous interpretations of restricted coastal lagoons and estuaries in east-central Kentucky are reinterpreted that the Givetian Sea consisted of a broad expanse of mostly shallow water environments. Basement fault reactivation may have generated local highs and depressions, and along with eustatic sea level changes accounts for the pronounced lateral variability seen in the Portwood.
机译：新奥尔巴尼页岩的中泥盆统波特伍德成员主要由深灰色至黑色的白云质页岩层段和棕褐色的风化白云岩夹层组成。它显示出白云石的薄层和薄层，并显示出多尺度的软沉积物变形。在肯塔基州的Barren湖岸边，最近对位于伊利诺伊盆地的具有波特伍德特征的岩石进行了曝光。由于波特伍德缺乏稀有的相关化石，因此将来自Barren River Lake的手标本和薄片与来自肯塔基州中部典型地区的样本进行了比较。从岩性上讲，Barren River Lake样品与肯塔基州中部的Portwood样品非常匹配，并且在碳酸盐含量（较高），沉积特征（白云质岩层的厚度，软质沉积物变形）和出处（深部石英岩）方面存在显着差异。 Trousdale成员。阿巴拉契亚和伊利诺伊盆地的泥盆纪中晚期黑色页岩含有大量粉砂大小的石英。石英在许多泥岩中含量丰富，并且可以源自碎屑碎屑或自生来源。碎屑石英被用于通过电子显微镜（SEM）扫描并使用背向散射（BSE）和阴极发光（CL）技术来测量物源。在Blocher（等效于Trousdale）和新奥尔巴尼页岩的Portwood成员之间的样品中，发现了深部变质石英和低品位变质石英数量的显着差异。两者都包含低品位的变质石英和自生石英。但是，波特伍德含有通过阴极发光确定的高含量的火成石英。在肯塔基州中东部的描述中，Portwood的厚度表现出很大的横向变化，并且由几个以侵蚀为界的沉积层序组成。贫瘠河湖地区以及辛辛那提拱门以西的任何波特伍德等价物都表明，在吉文田时期，辛辛那提拱门并不是活跃的构造元素。重新解释了以前在肯塔基州中东部限制沿海泻湖和河口的解释，即吉田海包括广阔的，大部分为浅水环境的区域。地下室断层的重新激活可能已经产生了局部的高点和低洼，并且伴随着欣喜的海平面变化解释了在波特伍德看到的明显的横向变化。

著录项

  • 作者

    Zabrecky, Justin Paul.;

  • 作者单位

    Indiana University.;

  • 授予单位 Indiana University.;
  • 学科 Geology.;Sedimentary Geology.
  • 学位 M.S.
  • 年度 2014
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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