一个湖沼滩脊复合体的地层框架和全新世晚期历史:洄游滩岬内的古气候档案

IF 2.4 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Christopher R. Mattheus , Mitchell Barklage , Katherine N. Braun , Ethan J. Theuerkauf
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引用次数: 0

摘要

本文重点研究了密歇根湖上一个正在迁移的滩原岬角的地貌、地层和年龄组成,并结合区域气候数据讨论了沿岸沉积物迁移动态的隐含变化。锡安滩脊平原是一个与大陆相连的系统,据信在过去的 4.5 千年中迁移了 10 千米,被划分为不同的地貌区。基于激光雷达的地形数据集和次表层反射地球物理记录显示,它在结构上被分割成不同的脊组,反映了一种点状的形态动力学发展,对理解地下水流模式、湿地生态学和海岸形态动力学演变具有影响。该地段最近的地貌边界可以追溯到一次高振幅的湖泊水位上升事件(3 米),该事件与区域主导风暴风向的转变相吻合。年轻、高起伏的沙丘脊地形与古老、低起伏的湿地草甸的突然并置,证明了在波浪和水流能量增强的条件下,沿岸沙粒迁移的速度加快。目前正在对这一事件和类似事件的地质年代进行改进,以加深我们对全新世晚期海岸演化的了解。作为重要的沿岸古气候档案,全球都在对平原进行研究,但在五大湖区,研究的重点是内 陆系统。虽然遮蔽环境(如基岩封闭的滩地)具有很高的保存潜力,最适于根据渐变序列进行古水文重建,但滩地岬角复杂的沉积结构可以提供前者所不包含的有关开阔水域过程的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stratigraphic framework and late Holocene history of a lacustrine beach-ridge complex: Paleoclimate archives within migrating strand promontories

This paper focuses on the physiography, stratigraphy, and age composition of a migrating strandplain promontory on Lake Michigan, discussing implied changes in alongshore sediment-transport dynamics within context of regional climate data. The Zion Beach-ridge Plain, a mainland-attached system believed to have migrated by >10 km over the past 4.5 kyrs, is partitioned into distinct physiographic zones. Its structural compartmentalization into distinct ridge sets, recognized in LiDAR-based topographic datasets and subsurface reflection geophysical records, reflects a punctuated morphodynamic development that has implications for understanding groundwater-flow patterns, wetland ecology, and coastal morphodynamic evolution. The most recent physiographic boundary within the strand dates to a high-amplitude lake-level rise event (>3 m in magnitude) that coincided with a regional shift in dominant storm-wind direction. The abrupt juxtaposition of young, high-relief dune-ridge terrain against old, low-relief wetland meadow attests to increased rates of littoral sand transport under conditions of heightened wave and current energies. Ongoing work to refine the geochronology of this and similar events is underway and stands to enhance our understanding of late Holocene coastal evolution. Strandplains are studied globally as important coastal paleoclimate archives, yet in the Great Lakes region the emphasis has been on embayed systems. While sheltered environments (e.g., bedrock-confined strandplains) foster high preservation potentials, optimal for paleohydrographic reconstructions from progradational sequences, the complex depositional architectures of strandplain promontories may provide information on open-water processes not contained within the former.

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来源期刊
Journal of Great Lakes Research
Journal of Great Lakes Research 生物-海洋与淡水生物学
CiteScore
5.10
自引率
13.60%
发文量
178
审稿时长
6 months
期刊介绍: Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.
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