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Late Quaternary evolution of the northwest Florida coast and margin: Development of a conceptual model for identifying and characterizing shelf sediment deposits.

机译：西北佛罗里达海岸和边缘的第四纪晚期演化：一种概念模型的开发，用于识别和表征陆架沉积物沉积。

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摘要

The objective of this investigation was the interpretation of the late Quaternary history of the northwest Florida margin and the development of a conceptual model for understanding the late Quaternary evolution of the regional coast and margin. The study area extends from the coastal Alabama-Florida border eastward to the mouth of the Ochlockonee River. Sea-level history, paleogeographic and coastal evolution data, paleoclimate data, granulometric data, beach profiles, sedimentary transport process data, historic charts and maps, subsurface seismic data, and granulometric data were the primary inputs to the model. Three sites were chosen for further investigation, including seismic data and vibracore acquisition. Nine vibracores were collected. Forty-eight sediment samples from the nine vibracores and analyzed for granulometry. The environments of deposition were interpreted for each site (and vibracore location), based upon the sedimentary structures found in the vibracores and the suite grain size statistics. Grain-size analyses indicate that the samples are of riverine origin, and that the source is likely to the east, probably the Apalachicola River. This supports the idea that the Apalachicola River is the major source of clastic sediment throughout the Quaternary in this region. Using interactive GIS, the new and existing data were utilized in the development of a conceptual model incorporating shelf paleogeography and locations of potential shelf sand bodies. Potential shelf borrow areas were identified based upon their bathymetric expression and/or prediction of paleoshoreline locations based upon sea-level history. As a result of the application of the conceptual model to the northwest Florida shelf, thirteen potential offshore sand features were identified. The characteristics of each sand feature were examined, including granulometry, color, water depth, thickness, areal extent, and total sand volume. The model was developed to facilitate the identification and characterization of shelf sedimentary deposits using the above tools. Many such deposits may be utilized in the future as sources for beach renourishment projects. Users of this model should be able to predict where shelf sand bodies may be located, and should be better able to determine where to focus geophysical and sedimentological field sampling. With the understanding of the buried paleogeography of the shelf and its expression in bathymetry, the conceptual model can aid in interpreting paleogeographic history within an area of interest. Such information can be valuable as a supplement to the sea-level history for the area. Using all of these elements -- a reliable conceptual model, a solid understanding of the paleogeography and sedimentary processes of the area, and a comprehensive GIS database -- researchers will be able to identify and characterize offshore sediment bodies for more intensive study, both for geologic investigations and for coastal renourishment projects.
机译：这项调查的目的是解释西北佛罗里达边缘的第四纪晚期历史，并开发一种概念模型来理解该地区海岸和边缘的第四纪晚期演化。研究区域从阿拉巴马州-佛罗里达州沿海边界向东延伸至Ochlockonee河口。该模型的主要输入是海平面历史，古地理和沿海演化数据，古气候数据，粒度数据，海滩剖面，沉积物运输过程数据，历史图表和地图，地下地震数据以及粒度数据。选择了三个地点进行进一步调查，包括地震数据和振动堆芯采集。收集了九个vibracores。来自九个颤动芯的48个沉积物样本并进行了粒度分析。根据在震颤芯中发现的沉积结构和随钻粒度统计信息，解释每个位置（以及震颤芯位置）的沉积环境。粒度分析表明，这些样品起源于河流，而其来源可能在东部，可能是阿巴拉契科拉河。这支持了以下观点：阿巴拉契科拉河是该地区整个第四纪碎屑沉积的主要来源。使用交互式GIS，新的和现有的数据被用于概念模型的开发，该模型结合了架子古地理学和潜在架子砂体的位置。根据它们的等深线表达和/或基于海平面历史的古海岸线位置预测，确定了潜在的陆架借贷区域。由于将该概念模型应用于佛罗里达西北部的陆架，因此确定了13种潜在的近海砂特征。检查了每个沙特征的特征，包括粒度，颜色，水深，厚度，面积范围和总沙量。开发该模型的目的在于使用上述工具促进对架子沉积物的识别和表征。将来，许多此类沉积物可能会用作海滩养育项目的资源。该模型的用户应该能够预测架子砂体可能位于何处，并且应该能够更好地确定将重点放在地球物理和沉积学领域采样上的位置。了解了架子的埋藏古地理及其在测深中的表示方式后，该概念模型可以帮助解释感兴趣区域内的古地理历史。这样的信息对于该地区的海平面历史记录可能是有价值的。使用所有这些元素-一个可靠的概念模型，对该地区古地理和沉积过程的扎实了解以及一个全面的GIS数据库-研究人员将能够识别和表征近海沉积物体，以进行更深入的研究，无论是对于地质调查和沿海养育项目。

著录项

  • 作者

    Koch, Jennifer Lynn.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Geology.;Sedimentary Geology.;Marine Geology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 313 p.
  • 总页数 313
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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