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首页> 外文学位 >A late-Quaternary record of environmental variability from lake sediment cores, Wind River Range, Wyoming.
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A late-Quaternary record of environmental variability from lake sediment cores, Wind River Range, Wyoming.

机译：怀俄明州风河山脉的湖泊沉积物核心环境变化的第四纪晚期记录。

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摘要

Sediment cores from two alpine lakes in Wyoming's Wind River Range were collected and analyzed to establish a record of depositional and mineralogical variability. Due to the hydrologic setting and isolation of Fiddlers and Louis lakes, these cores yielded the longest continuous limnological record in the region that extends back nearly 20,000 years to full-glacial conditions, a rarity for alpine lakes in the western United States.;To develop a paleolimnological record for Fiddlers and Louis lakes, the sediment cores were analyzed using four laboratory techniques. These techniques included particle size analysis, x-ray diffraction, heavy mineral analysis, and loss-on-ignition. Radiocarbon ages from Fiddlers Lake's sediment allowed the record of sedimentological changes to be numerically dated. Using this multi-proxy approach, a history of late-Quaternary depositional and mineralogical variability was established and compared with regional paleoclimate studies.;The results from the both lakes' cores showed similar responses to local and regional glacial/post-glacial environmental changes and revealed four distinct depositional phases: full-glacial, late-glacial, transitional and post-glacial. The timing of sedimentological responses in Fiddlers and Louis lakes corroborates previous research in the Wind River Range, most notably that of Fall, Zielinski and Davis (1995).;Paleoclimate records developed from this study enhance the present understanding of the region's climate history while the sedimentological data give insight into the depositional characteristics during climate transitions.
机译：收集并分析了怀俄明州风河山脉两个高山湖泊的沉积物芯，并建立了沉积和矿物学变化的记录。由于水文环境和Fiddlers和Louis湖泊的隔离，这些岩心在该地区产生了最长的连续岩性记录，该记录可追溯到将近20,000年直至全冰川期，这在美国西部的高山湖泊中很少见。在Fiddlers和Louis湖的古湖泊学记录中，使用四种实验室技术对沉积物芯进行了分析。这些技术包括粒度分析，X射线衍射，重矿物分析和着火损失。 Fiddlers湖沉积物的放射性碳年龄使得沉积学变化的记录可以用数字标出。使用这种多代理方法，建立了第四纪晚期沉积和矿物学变化的历史，并与区域古气候研究进行了比较;;两个湖泊核心的结果显示出对局部和区域冰川/冰川后环境变化的相似反应;揭示了四个不同的沉积阶段：全冰川期，晚冰川期，过渡期和后冰川期。 Fiddlers和Louis湖泊的沉积学响应时间证实了风河山脉以前的研究，特别是Fall，Zielinski和Davis（1995）的研究。该研究获得的古气候记录增强了对该地区气候史的当前理解。沉积学数据可以洞悉气候转变过程中的沉积特征。

著录项

  • 作者

    Johnson, Tyler John.;

  • 作者单位

    University of Northern Iowa.;

  • 授予单位 University of Northern Iowa.;
  • 学科 Physical Geography.;Paleoclimate Science.
  • 学位 M.A.
  • 年度 2010
  • 页码 227 p.
  • 总页数 227
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

  • 入库时间 2022-08-17 11:36:55

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