首页> 外文学位 >Sedimentology, diagenesis, and dolomitization of the Brac Formation (Lower Oligocene), Cayman Brac, British West Indies.
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Sedimentology, diagenesis, and dolomitization of the Brac Formation (Lower Oligocene), Cayman Brac, British West Indies.

机译:英属西印度群岛开曼布拉克Brac组(下渐新世)的沉积学,成岩作用和白云石化作用。

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摘要

The Oligocene Brac Formation is the oldest part of the Bluff Group that is exposed on Cayman Brac. Sediments of the Brac Formation were deposited on a small, open bank in shallow marine waters. Today, the formation is composed of limestone, finely crystalline dolostone, and coarsely crystalline sucrosic dolostone. The Pollard Bay member, defined herein, comprises the sucrosic dolomite that is exposed only on the south coast of Cayman Brac. Changes in sea level and subsequent groundwater chemistry mediated a complex diagenetic evolution that is responsible for the lithological heterogeneity that now characterizes the formation. Field, petrographic, and geochemical analyses indicate that dolomitization was probably mediated by normal to slightly modified seawater. Multiphase dolomite crystals represent different stages of textural and geochemical maturity, and attest to time-transgressive dolomitization processes that evolved in various hydrologic regimes through time.
机译:渐新世的布拉奇地层是布拉夫族中最古老的部分,在开曼布拉克地区暴露。 Brac地层的沉积物沉积在浅海海水中的一个小而开放的河岸上。如今,该地层由石灰岩,细晶白云岩和粗晶sucrosic白云岩组成。本文所定义的Pollard Bay成员包括仅在开曼布拉克南海岸露出的缝隙白云岩。海平面的变化和随后的地下水化学作用介导了复杂的成岩作用演化,这是现在表征该地层的岩性非均质性的原因。野外,岩相和地球化学分析表明,白云石化可能是由正常到略微改变的海水介导的。多相白云岩晶体代表了质地和地球化学成熟的不同阶段,并证明了随时间变化的在不同水文环境中演化的时移性白云石化过程。

著录项

  • 作者

    Uzelman, Breanna Corynne.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Geology.;Sedimentary Geology.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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