Experimental Investigations on the Role of H2O in Magmatic Processes

H2O 在岩浆过程中作用的实验研究

基本信息

  • 批准号:
    0538179
  • 负责人:
  • 金额:
    $ 35.96万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2006
  • 资助国家:
    美国
  • 起止时间:
    2006-06-01 至 2012-05-31
  • 项目状态:
    已结题

项目摘要

Intellectual Merit: Experiments are proposed to develop quantitative models of the effects of H2O on the temperature and pressure of melting in the uppermost mantle and fractional crystallization in the Earth's crust. The cycling of water through the Earth's interior is of fundamental importance for understanding the chemical evolution of the Earth over geologic time. The importance of H2O in igneous processes has been known for a long time, but experimental calibrations of the effects of H2O are few and far between. Such data are necessary for developing quantitative tools for estimating H2O abundances in magmas and understanding the influence of H2O on magmatic processes. To make progress new measurements are required on broad range of experimental projects.Three projects are proposed. 1) A systematic investigation of the influence of H2O on the liquidus of natural basaltic melts. These experiments will determine the effects of variable amounts of H2O on liquidus temperature. The experiments will form the basis for models of melting point lowering and help resolve the considerable uncertainty on the influence of small amounts of H2O on melting. 2) Investigation of the role of H2O, pressure and mantle composition on garnet peridotite melting. These experiments will provide quantitative estimates of the role played by H2O and mantle bulk composition (primarily the alkali elements Na2O and K2O) on the composition and temperature of magmas produced in subduction zone and sub continental mantle environments. 3) Experimental studies of the role of H2O and pressure on fractional crystallization of basaltic melts in the crust. In arc magmatic systems the compositional characteristics of differentiated arc magmas and their mineral assemblages provide evidence of the pre-eruptive H2O content, temperature and depth history of differentiation. Experimental studies of basalt and andesite magmas will be carried out at pressures of 300 to 800 MPa over a range of oxygen fugacities under H2O-saturated conditions. This work is motivated by the high pre-eruptive contents (up to 10 wt. % H2O) that have been inferred in arc magmas from the Cascades and Mexican Volcanic Belt. For all of the preceding studies we will develop thermodynamically based analytic models that allow prediction of conditions of melting/crystallization and compositions of melts generated when H2O is involved.Broader Impacts: The information derived from these studies will be broadly disseminated through publication in profrssional journals. The information on H2O will be of broad interest in the geodynamics and mineral physics community and ultimately has relevance for the origin of the Earth's oceans and life on Earth. The experimental expertise gained from this study will be shared with other members of the experimental community and models for predicting temperature, H2O content and pressure of melting/crystallization will be developed and distributed for petrologic modeling. This project will train graduate and undergraduate students in research methods of experimental petrology/geochemistry. The research will allow them to participate in the design, execution and interpretation of experiments, which often provides motivation and interest that lasts throughout their scientific career.
智力优势:实验提出了发展定量模型的影响H2O的温度和压力的熔融在上地幔和分离结晶在地壳中。水在地球内部的循环对于理解地质时期地球的化学演化具有根本的重要性。H2O在火成过程中的重要性早已为人们所知,但对H2O影响的实验校准却少之又少。这些数据是必要的发展定量工具,估计H2O丰度的岩浆和了解H2O对岩浆过程的影响。为了取得进展,需要对广泛的实验项目进行新的测量。1)水对天然玄武岩熔体液相线影响的系统研究。这些实验将确定不同量的H2O对液相线温度的影响。实验将形成熔点降低模型的基础,并有助于解决少量H2O对熔化的影响的相当大的不确定性。2)水、压力和地幔成分对石榴橄榄岩熔融作用的研究。这些实验将提供定量估计的作用所发挥的H2O和地幔整体组成(主要是碱性元素Na 2 O和K2 O)的组成和温度的岩浆在俯冲带和亚大陆地幔环境中产生的。3)水和压力对地壳中玄武岩熔体分离结晶作用的实验研究。在弧岩浆系统中,分异弧岩浆的成分特征及其矿物组合提供了爆发前H2O含量、温度和深度分异历史的证据。玄武岩和安山岩岩浆的实验研究将在300至800 MPa的压力下,在H2O饱和条件下的氧逸度范围内进行。这项工作的动机是高喷发前的内容(高达10重量%)。% H2O),已推断在弧岩浆从瀑布和墨西哥火山带。对于所有的前面的研究,我们将开发的分析模型,允许熔化/结晶的条件和组成的熔体时产生的H2O是involved.Broader影响的预测:从这些研究中得到的信息将通过在专业期刊上发表广泛传播。关于H2O的信息将引起地球动力学和矿物物理学界的广泛兴趣,并最终与地球海洋和地球生命的起源有关。从这项研究中获得的实验专业知识将与实验社区的其他成员分享,并将开发和分发用于预测温度,H2O含量和熔融/结晶压力的模型,用于岩石学建模。本项目将对研究生和本科生进行实验岩石学/地球化学研究方法的培训。这项研究将使他们能够参与实验的设计,执行和解释,这通常会提供贯穿其科学生涯的动力和兴趣。

项目成果

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Timothy Grove其他文献

Origin of lunar high-titanium ultramafic glasses: A hybridized source?
  • DOI:
    10.1016/j.epsl.2008.01.019
  • 发表时间:
    2008-04-15
  • 期刊:
  • 影响因子:
  • 作者:
    Steven Singletary;Timothy Grove
  • 通讯作者:
    Timothy Grove

Timothy Grove的其他文献

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{{ truncateString('Timothy Grove', 18)}}的其他基金

ABR: Experimental Studies of Hydrous Mantle Melting
ABR:含水地幔熔化的实验研究
  • 批准号:
    1551321
  • 财政年份:
    2016
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Continuing Grant
Collaborative Research: Developing a New Model to Investigate the Dynamics of Melt Generation beneath Mid-Ocean Ridges
合作研究:开发一种新模型来研究大洋中脊下方融化生成的动力学
  • 批准号:
    1457916
  • 财政年份:
    2015
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
Experimental Investigations of the Role of H2O in Subduction Zone Processes
H2O 在俯冲带过程中作用的实验研究
  • 批准号:
    1118598
  • 财政年份:
    2011
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Continuing Grant
Acquisition of an Electron Microprobe for the MIT User Community
为麻省理工学院用户社区购买电子显微探针
  • 批准号:
    0841161
  • 财政年份:
    2009
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
Collaborative Research: Understanding the Causes of Continental Intraplate Tectonomagmatism: A Case Study in the Pacific Northwest
合作研究:了解大陆板内构造岩浆作用的原因:太平洋西北地区的案例研究
  • 批准号:
    0507486
  • 财政年份:
    2005
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Continuing grant
Upgrading the MIT Experimental Petrology Laboratory
升级麻省理工学院实验岩石学实验室
  • 批准号:
    0447204
  • 财政年份:
    2005
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
Collaborative Research: A New Experimental Database for Improving and Extending MELTS
协作研究:用于改进和扩展 MELTS 的新实验数据库
  • 批准号:
    0440045
  • 财政年份:
    2005
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
Experimental Investigations on the Role of H20 in Magmatic Processes
H20 在岩浆过程中作用的实验研究
  • 批准号:
    0440172
  • 财政年份:
    2005
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
CSEDI: Collaborative Research: New Experimental Approaches to He/U-Th Partitioning of the Mantle
CSEDI:合作研究:He/U-Th 地幔划分的新实验方法
  • 批准号:
    0215547
  • 财政年份:
    2002
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant
Multiple Track Modern Physics Laboratory for Developing Experimental and Analytical Skills
用于培养实验和分析技能的多轨现代物理实验室
  • 批准号:
    0127078
  • 财政年份:
    2002
  • 资助金额:
    $ 35.96万
  • 项目类别:
    Standard Grant

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