• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Stable-isotope and trace-element composition on ostracode shells and their application to paleoclimatic reconstruction in the Northern Great Plains.
【24h】

Stable-isotope and trace-element composition on ostracode shells and their application to paleoclimatic reconstruction in the Northern Great Plains.

机译：Ostracode贝壳上的同位素和痕量元素组成及其在北部大平原古气候重建中的应用。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The calcite shells of ostracodes are an important source of biogenic carbonate that can be analyzed for its isotopic composition and trace element ratios to provide an account of chemistry and temperature changes in closed-basin lakes. The variations in lake chemistry and temperature can in turn provide high-resolution records of hydrologic and climatic change in the study area.;The individual adult ostracodes collected monthly from Roslyn Lake, South Dakota, and Coldwater Lake, North Dakota, showed large variations in ;The geochemistry of ostracode shells and bulk carbonates in a 19-meter long sediment core documents at century-scale resolution the evolution of water chemistry in Coldwater Lake, providing a continuous paleohydrologic record of Holocene climate change in the northern Great Plains. A combination of ;Accurate interpretation of the geochemical record from fossil ostracodes requires a solid understanding of ostracode isotope-chemistry and life-history. To explore these issues, ostracodes were cultured in the laboratory under controlled water chemistry and temperature. The shell of ostracode, Candona rawsoni, formed at experimental temperatures are not in isotopic equilibrium with water, but had a constant offset from equilibrium oxygen-isotope fractionation of inorganic carbonates. The shells are enriched by about 0.8-1.0
机译：ostracodes的方解石壳是生物碳酸盐的重要来源，可以对其同位素组成和微量元素比率进行分析，以提供对密闭盆地湖泊化学和温度变化的解释。湖泊化学和温度的变化反过来可以为研究区域提供高分辨率的水文和气候变化记录。每月从南达科他州的罗斯林湖和北达科他州的冷水湖采集的成年雌性稻瘟病菌的变化很大。 ；在19米长的沉积物岩心中的ostracode壳和大量碳酸盐的地球化学以百年尺度解析了冷水湖中水化学的演化，提供了大平原北部全新世气候变化的连续古水文学记录。准确解释化石ostracode的地球化学记录需要结合对ostracode同位素化学和生命史的深入了解。为了探索这些问题，在实验室中在受控的水化学和温度下培养了Ostracodes。在实验温度下形成的Ostracode壳Candona rawsoni与水的同位素平衡不同，但与无机碳酸盐的平衡氧-同位素分馏具有恒定的偏移。贝壳富含约0.8-1.0

著录项

  • 作者

    Xia, Juanjuan.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Geology.;Paleoecology.;Geochemistry.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 148 p.
  • 总页数 148
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号