Melt Inclusion Study of Water and Chlorine Abundances in HIMU- and EM-type Mantle

HIMU型和EM型地幔中水和氯丰度的熔体包裹体研究

基本信息

  • 批准号:
    0510449
  • 负责人:
  • 金额:
    $ 21.29万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2005
  • 资助国家:
    美国
  • 起止时间:
    2005-06-01 至 2010-05-31
  • 项目状态:
    已结题

项目摘要

This project will examine volatile abundances (water, CO2, Cl, and S) in olivine-hosted melt inclusions from lavas from the Austral Island chain. Previous study of lavas from these islands indicates the involvement of three distinct mantle components, including a component believed to derive from ancient recycled oceanic crust. Volatile element abundance and speciation data will be combined with major and trace element data as well as in situ Pb-isotope data to evaluate several fundamental questions regarding the genesis of these lavas and the nature of their mantle sources. Specific questions that will be addressed include: (i) do variations in Cl concentrations and Cl/K2O ratios in Austral Islands melt inclusions derive from shallow melt/crust or melt/hydrosphere interaction, or do these variations track volatile element abundances in the different mantle reservoirs involved in basalt genesis? (ii) to what extent do water and chlorine abundances correlate with other isotopic and trace element signatures indicative of the presence of recycled oceanic crust? (iii) how much water or chlorine is retained in subducted oceanic crust and returned to the deep mantle after subduction-induced dehydration?The abundance and distribution of water and other volatile species in the mantle has a significant effect on mantle convection, melt generation, and other fundamental processes involved in the chemical and physical evolution of the Earth's interior. Interaction of the Earth's interior with the hydrosphere and atmosphere may also alter the Earth's surface environment on geologic timescales. At present, the amount and distribution of water and other volatiles in the mantle are poorly constrained. It is also unclear whether the processes of plate creation and later subduction result in a net gain or a net loss of water and other volatiles at the Earth's surface. This study will provide a better understanding of the abundance and origin of volatile species in different mantle reservoirs and the role that plate tectonics and plate subduction have played in controlling degassing (and possibly re-gassing) of the mantle over time.
该项目将研究挥发性丰度(水,CO2,Cl和S)的橄榄石托管熔融包裹体熔岩从南极岛链。 以前对这些岛屿熔岩的研究表明,三种不同的地幔成分参与其中,其中一种成分被认为来自古老的再生海洋地壳。 挥发性元素丰度和物种形成数据将结合主要和微量元素数据以及原位铅同位素数据,以评估有关这些熔岩的成因及其地幔来源的性质的几个基本问题。 具体的问题,将得到解决包括:(一)Cl浓度和Cl/K2 O比在南方群岛熔融包裹体的变化来自浅熔体/地壳或熔体/水圈的相互作用,或这些变化跟踪挥发性元素丰度在不同的地幔水库参与玄武岩成因? (ii)水和氯的丰度在多大程度上与其他同位素和微量元素特征相关,表明存在循环洋壳? (iii)有多少水或氯保留在俯冲洋壳中,并在俯冲引起的脱水后返回到深部地幔?地幔中水和其他挥发性物质的丰度和分布对地幔对流、熔体生成以及地球内部化学和物理演化中涉及的其他基本过程有重大影响。 地球内部与水圈和大气层的相互作用也可能在地质时间尺度上改变地球表面的环境。 目前,地幔中水和其他挥发分的数量和分布受到很差的限制。 目前还不清楚板块形成和后来的俯冲过程是否会导致地球表面水和其他挥发物的净增加或净损失。 这项研究将提供一个更好的了解的丰度和起源的挥发性物质在不同的地幔水库和作用,板块构造和板块俯冲在控制脱气(可能再放气)的地幔随着时间的推移。

项目成果

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John Lassiter其他文献

John Lassiter的其他文献

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{{ truncateString('John Lassiter', 18)}}的其他基金

Collaborative Research: Using Osmium-Lead isotope variations in mid-ocean ridge and abyssal peridotite sulfides to understand fundamental properties of Earth's mantle
合作研究:利用大洋中脊和深海橄榄岩硫化物中的锇铅同位素变化来了解地幔的基本特性
  • 批准号:
    1736995
  • 财政年份:
    2017
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Standard Grant
Insights into Hawaiian Magma Storage and Melt/Crust Interaction from Geochemical and Petrologic Investigation of Xenoliths from Hualalai and Mauna Kea Volcanoes
通过对华拉莱火山和莫纳克亚火山捕虏体进行地球化学和岩石学研究,深入了解夏威夷岩浆储存和熔体/地壳相互作用
  • 批准号:
    1650340
  • 财政年份:
    2017
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Continuing Grant
CSEDI: Constraining the mechanisms of melt transport, storage, and crustal contamination from temporal geochemical variations in monogenetic vents
CSEDI:限制单源喷口时间地球化学变化造成的熔体传输、储存和地壳污染机制
  • 批准号:
    1301621
  • 财政年份:
    2013
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Standard Grant
Testing Models for the Origin of 186Os/188Os and 187Os/188Os Isotope Variations in the Mantle: Core Signal, Recycled Components, or Intra-mantle Differentiation
地幔中 186Os/188Os 和 187Os/188Os 同位素变化起源的测试模型:核心信号、回收成分或地幔内分化
  • 批准号:
    1321937
  • 财政年份:
    2013
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Continuing Grant
Geochemical Investigation of Xenoliths From the Central Rio Grande Rift and Colorado Plateau: Constraints on Lithosphere Evolution and Possible Delamination
里奥格兰德裂谷中部和科罗拉多高原捕虏体的地球化学调查:对岩石圈演化和可能的分层的限制
  • 批准号:
    0911253
  • 财政年份:
    2009
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Standard Grant
Collaborative Research: Constraining the Relative Importance of Fluid Fluxes and Lithospheric Metasomatism on the Evolution of the Rio Grande Rift, New Mexico
合作研究:限制流体通量和岩石圈交代作用对新墨西哥州格兰德裂谷演化的相对重要性
  • 批准号:
    0810152
  • 财政年份:
    2008
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Standard Grant
Acquisition of a Thermal Ionization Mass Spectrometer with Positive and Negative Ion Capability for Geologic Research
购买具有正离子和负离子功能的热电离质谱仪用于地质研究
  • 批准号:
    0651177
  • 财政年份:
    2007
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Continuing Grant
Collaborative Research: Os, Nd and Hf isotopes in abyssal peridotites from Arctic Lena Trough: Continental lithospheric or asthenospheric mantle origin?
合作研究:北极勒拿海槽深海橄榄岩中的 Os、Nd 和 Hf 同位素:大陆岩石圈或软流圈地幔起源?
  • 批准号:
    0648409
  • 财政年份:
    2007
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Standard Grant
Earth Sciences Postdoctoral Research Fellowship Award
地球科学博士后研究奖学金
  • 批准号:
    9505215
  • 财政年份:
    1995
  • 资助金额:
    $ 21.29万
  • 项目类别:
    Fellowship Award

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