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Secular Evolution in the Composition of the Mantle

Secular Evolution in the Composition of the Mantle
地幔成分的长期演化
批准号:
9506517
负责人:
Stein Jacobsen
金额:
$21.96万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1996
资助国家:
美国
项目状态:
已结题
起止时间:
1996-02-01 至 2000-01-31

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中文摘要
翻译
9506517 Jacobsen现今地幔的成分变化是由地质时期的许多壳幔和地幔内分异过程造成的。 其中一些古老的过程与今天发生的过程有着明显的不同。 大陆地壳的形成对现今地幔的组成有着最大的影响,但这究竟是如何以及何时发生的却存在争议。 建议对现代和古代镁铁质至超镁铁质熔岩及其熔融包裹体进行一系列高质量的地球化学测量,这将对地幔成分的长期演化产生新的见解。 这些研究中最重要的是将使用微束技术对古熔岩中的橄榄石熔融包裹体进行研究,以确定原生熔岩及其源区的成分特征。 科马提岩样品含有橄榄石托管熔融包裹体从广泛变化的时间和空间协会将进行调查。 这些微束技术也将被应用于确定现代海洋玄武岩的玻璃质部分的成分,以建立在熔岩及其源区的不相容元素的“恒定比例”的变化。 描述地幔成分的长期演化将有助于加深对壳幔和地幔内分异过程及其发生速率的理解。
英文摘要
9506517 Jacobsen The compositional variation of the present-day mantle results from a number of crust-mantle and intra-mantle differentiation processes operating over geologic time. Some of these ancient processes many have been markedly different from those occurring today. The production of continental crust has had the greatest influence in establishing the composition of the present-day mantle, but exactly how and when this occurred is controversial. It is proposed to conduct a series of high quality geochemical measurements of modern and ancient mafic to ultramafic lavas and their melt inclusions that will yield new insights into the secular evolution in the composition of the mantle. Foremost among these studies will be the use of microbeam techniques on olivine-hosted melt inclusions in ancient lavas to determine the compositional characteristics of the primary lavas and their source regions. Komatiitic samples containing olivine-hosted melt inclusions from widely varying temporal and spatial associations will be investigated. These microbeam techniques will also be applied to determine the compositions of glassy portions of modern oceanic basalts in order to establish variations in "constant ratios" of incompatible elements in the lavas and their source regions. Characterizing the secular evolution of the composition of the mantle will lead to a enhanced understanding of crust-mantle and intra-mantle differentiation processes and the rate at which they occurred.
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Ca Isotope Variations in Oceanic Basalts
  • 批准号:
    1144727
  • 项目类别:
    Continuing Grant
  • 资助金额:
    $35.21万
  • 财政年份:
    2012
  • 负责人:
    Stein Jacobsen
  • 依托单位:
EAGER: A Test for the Younger Dryas Impact Hypothesis
  • 批准号:
    1007367
  • 项目类别:
    Standard Grant
  • 资助金额:
    $8.04万
  • 财政年份:
    2010
  • 负责人:
    Stein Jacobsen
  • 依托单位:
EAGER: Recycled Carbonate-Rich Sediment in the Hawaiian Plume? Evidence from Ca Isotopes
  • 批准号:
    0951487
  • 项目类别:
    Standard Grant
  • 资助金额:
    $5.27万
  • 财政年份:
    2009
  • 负责人:
    Stein Jacobsen
  • 依托单位:
Technician Support: EPS TIMS Facility at Harvard (Phase II)
  • 批准号:
    0093652
  • 项目类别:
    Continuing Grant
  • 资助金额:
    $8.06万
  • 财政年份:
    2001
  • 负责人:
    Stein Jacobsen
  • 依托单位:
国内基金
海外基金
Galaxy Analytical Modeling Evolution (GAME) and cosmological hydrodynamic simulations.
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    省市级项目
  • 资助金额:
    10.0万元
  • 批准年份:
    2025
  • 负责人:
    Antonios Katsianis
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Understanding structural evolution of galaxies with machine learning
  • 批准号:
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    省市级项目
  • 资助金额:
    10.0万元
  • 批准年份:
    2022
  • 负责人:
    Nicola Rosario Napolitano
  • 依托单位:
The formation and evolution of planetary systems in dense star clusters
  • 批准号:
    11043007
  • 项目类别:
    专项基金项目
  • 资助金额:
    10.0万元
  • 批准年份:
    2010
  • 负责人:
    柯文采
  • 依托单位:
Improving modelling of compact binary evolution.
  • 批准号:
    10903001
  • 项目类别:
    青年科学基金项目
  • 资助金额:
    20.0万元
  • 批准年份:
    2009
  • 负责人:
    史蒂芬
  • 依托单位: