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首页> 外文学位 >Geochemical characteristics of Pacific seamount ferromanganese crusts: Evidence for their genesis.
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Geochemical characteristics of Pacific seamount ferromanganese crusts: Evidence for their genesis.

机译：太平洋海山铁锰结壳的地球化学特征：成因的证据。

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摘要

The millimeter scale compositional variability of Fe-Mn oxide crusts from a seamount near Phoenix Islands in Kiribati, and another near Hawaii was investigated. This study is designed to evaluate how the changes in the mineralogy, internal structure, and chemical composition of crusts relate to their growth history, and elucidate the changes in oceanic water chemistry which the crusts experienced. Thirty-seven major and minor constituents, and the rare earth elements (REE) were analyzed by ICP/AES and ICP/MS in subsamples picked at approximately 2mm intervals throughout the crust sequences. Principal component factor analysis indicates that the chemical composition of crusts in general can be partitioned among four major genetic groups. The geochemistry of the crusts is highly dependent on conditions in the local environment and on the local seawater chemistry rather than on basin-wide oceanic conditions. Paleotracks are proposed for these crust based upon the results of factor scores. These, aided by REE and biostratigraphic data (Cowen et al., 1993), are used to reconstruct the growth history of the crusts and the possible environmental records of ocean.
机译：研究了基里巴斯凤凰岛附近海山和夏威夷附近海山的Fe-Mn氧化物结壳的毫米级成分变异性。这项研究旨在评估地壳的矿物学，内部结构和化学成分的变化如何与其生长历史相关，并阐明地壳经历的海洋水化学变化。通过ICP / AES和ICP / MS在整个地壳序列中以约2mm的间隔采集的子样本中分析了37种主要和次要成分以及稀土元素（REE）。主成分因子分析表明，地壳的化学成分通常可以划分为四个主要的基因组。地壳的地球化学高度依赖于当地环境条件和当地海水化学条件，而不是整个盆地的海洋条件。根据因子得分的结果，对这些地壳提出了古迹。这些在稀土元素和生物地层学数据的帮助下（Cowen等，1993）被用于重建地壳的生长历史和可能的海洋环境记录。

著录项

  • 作者

    Wen, Xiyuan.;

  • 作者单位

    University of Hawai'i at Manoa.;

  • 授予单位 University of Hawai'i at Manoa.;
  • 学科 Geochemistry.;Geology.
  • 学位 M.A.
  • 年度 1995
  • 页码 131 p.
  • 总页数 131
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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