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Sequence stratigraphy of the Arcadia Formation, southeast Florida: An integrated approach.

机译：佛罗里达东南部阿卡迪亚组层序地层学：一种综合方法。

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摘要

The Arcadia Formation is a mixed carbonate-siliciclastic rock unit that existed as a shallow carbonate ramp to platform environment during the Late Oligocene to Early Miocene Epoch. It can be divided into two distinct, informal sections based on lithological properties: the upper Arcadia Formation and lower Arcadia Formation. The sections are part of a major, third-order sequence that can be further divided into four higher-frequency, lower magnitude sequences: ARS1, ARS2, ARS3, and ARS4. The sequence boundary separating ARS2 and ARS3 represents a drastic change in the depositional regime from a high-energy, inner ramp/platform to a lower-energy, deep outer ramp environment. ARS3 represents the period of maximum flooding and constitutes a major portion of the regressive system tract (RST) of the third order depositional sequence. In certain sections, the Arcadia Formation is heavily bioturbated including ichnotaxa from the glossifungites, cruziana, and scolithos inchofacies. Thalassinoides sp. burrows of the glossifungites ichnofacies were found to be commonly associated with firmground substrates and breaks in sedimentation. The lithofacies associations were grouped into paleodepositional environments that ranged from restricted marine to deep outer ramp with lithology ranging from grainstone to wackestone to mudstone with variable amounts of siliciclastic and phosphatic constituents. Each sequence boundary extends regionally south from Broward County to southern Miami-Dade County utilizing gamma-ray geophysical signatures unique to each sequence.
机译：阿卡迪亚地层是碳酸盐-硅质碎屑岩混合单元，在渐新世晚期至中新世初期，以浅碳酸盐岩斜坡向平台环境的形式存在。根据岩性，可将其分为两个不同的非正式部分：上阿卡迪亚组和下阿卡迪亚组。这些部分是主要的三阶序列的一部分，可以进一步分为四个更高频率，更低幅度的序列：ARS1，ARS2，ARS3和ARS4。分隔ARS2和ARS3的层序边界代表了沉积形式从高能内部斜坡/平台到低能深外部斜坡环境的剧烈变化。 ARS3代表最大洪水期，并构成三阶沉积序列的回归系统道（RST）的主要部分。在某些区域中，阿卡迪亚地层受到了严重的生物扰动，其中包括来自光泽真菌，克鲁萨纳和scolithos岩藻的鱼鳞目。 Thalassinoides sp。人们发现，闪锌矿岩相的洞穴通常与坚硬的基质和沉积物破裂有关。岩相组合分为古沉积环境，范围从受限制的海洋到深外斜坡，其岩性范围从粒岩到瓦克石再到泥岩，其中硅硅质和磷的含量各不相同。每个序列边界利用每个序列特有的伽马射线地球物理特征从布劳沃德县向南延伸到南部迈阿密-戴德县。

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  • 作者

    Wright, Caroline M.;

  • 作者单位

    Florida Atlantic University.;

  • 授予单位 Florida Atlantic University.;
  • 学科 Geology.;Paleoclimate Science.;Sedimentary Geology.
  • 学位 M.S.
  • 年度 2014
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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