Integrating Experiments With Observations at Oldoinyo Lengai; Insights Into Alkalic Magmatic Processes

将 Oldoinyo Lengai 的实验与观察相结合;

基本信息

项目摘要

The formation and eruption of magma from the world's only carbonatite volcano, Ol Doinyo Lengai in Tanzania, continues to amaze and perplex earth scientists. The magma originates as mantle derived but the processes leading to its unique, low temperature lava remain undefined. What is the process that forms it? This project will undertake experiments and analyses of lavas from this volcano to gain fundamental insight into the general processes by which Earth's magmas change composition and ultimately erupt.Previous workers have hypothesized that these magmas reflect an immiscibility reaction that occurs to ultimately form two magmas, one silicate and one carbonatite. These researchers will perform the new technique of Fe isotope ratio analyses along with laboratory experiments at high pressure and temperature to assess this hypothesis. Specifically, they will perform experiments to measure the Fe isotopic fractionation factor between 2 coexisting immiscible melts. Furthermore, they will perform thermal gradient experiments to assess the possible role of this process on forming the compositional evolution sequence observed in erupted rocks. The team will use new tomographic X-ray imaging techniques to assess the melt distribution in these experiments to help constrain observed electromagnetic signatures around Ol'doinyo Lengai. Use of U-series disequilibria techniques will allow us to constrain the timing and processes of magma formation with the thermal gradient experiment results used to assess a new model for disequilibria generation. The information obtained will help to understand the hazards associated with continental rift volcanism.
世界上唯一的碳酸岩火山——坦桑尼亚的Ol Doinyo Lengai火山——岩浆的形成和喷发,继续让地球科学家感到惊奇和困惑。岩浆起源于地幔,但导致其独特的低温熔岩的过程尚不清楚。形成它的过程是什么?该项目将对这座火山的熔岩进行实验和分析,以获得对地球岩浆改变成分并最终喷发的一般过程的基本见解。以前的工作人员假设,这些岩浆反映了一种不混溶反应,最终形成了两种岩浆,一种是硅酸盐岩浆,一种是碳酸盐岩岩浆。这些研究人员将采用新的铁同位素比率分析技术,并在高压和高温下进行实验室实验来评估这一假设。具体来说,他们将进行实验来测量两种共存的不混溶熔体之间的铁同位素分馏系数。此外,他们将进行热梯度实验,以评估这一过程在形成喷发岩石中观察到的成分演化序列中的可能作用。该团队将使用新的层析x射线成像技术来评估这些实验中的熔体分布,以帮助限制在Ol'doinyo Lengai周围观察到的电磁特征。利用u系列不平衡技术将使我们能够用热梯度实验结果来限制岩浆形成的时间和过程,用于评估不平衡产生的新模型。获得的信息将有助于了解与大陆裂谷火山作用有关的危险。

项目成果

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Craig Lundstrom其他文献

Chemical and physical weathering in south Patagonian rivers: A combined Sr–U–Be isotope approach
  • DOI:
    10.1016/j.gca.2012.09.054
  • 发表时间:
    2013-01-15
  • 期刊:
  • 影响因子:
  • 作者:
    Borom Lee;Yeongcheol Han;Youngsook Huh;Craig Lundstrom;Lionel L. Siame;Jong Ik Lee;Byong-Kwon Park; ASTER Team
  • 通讯作者:
    ASTER Team
Plume–ridge interaction studied at the Galápagos spreading center: Evidence from <sup>226</sup>Ra–<sup>230</sup>Th–<sup>238</sup>U and <sup>231</sup>Pa–<sup>235</sup>U isotopic disequilibria
  • DOI:
    10.1016/j.epsl.2005.02.031
  • 发表时间:
    2005-05-30
  • 期刊:
  • 影响因子:
  • 作者:
    Thomas Find Kokfelt;Craig Lundstrom;Kaj Hoernle;Folkmar Hauff;Reinhard Werner
  • 通讯作者:
    Reinhard Werner
δ56Fe of magnetite as a tool for tracking mush-to-magma processes
δ56Fe 磁铁矿作为追踪糊状岩浆过程的工具
  • DOI:
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Karoline M Bruckel;Craig Lundstrom
  • 通讯作者:
    Craig Lundstrom
<sup>231</sup>Pa systematics in postglacial volcanic rocks from Iceland
  • DOI:
    10.1016/j.gca.2015.12.011
  • 发表时间:
    2016-07-15
  • 期刊:
  • 影响因子:
  • 作者:
    Simon Turner;Thomas Kokfelt;Kaj Hoernle;Craig Lundstrom;Folkmar Hauff
  • 通讯作者:
    Folkmar Hauff

Craig Lundstrom的其他文献

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{{ truncateString('Craig Lundstrom', 18)}}的其他基金

Collaborative Research: Investigating formation of stagnant slabs and implications for subduction dynamics
合作研究:调查静止板片的形成及其对俯冲动力学的影响
  • 批准号:
    2244660
  • 财政年份:
    2023
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
EAGER: Investigating the possibility of low temperature (<700 C) melt in silicic igneous systems
EAGER:调查低温的可能性(
  • 批准号:
    1919714
  • 财政年份:
    2019
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Acquisition of a laser ablation system for the Department of Geology, UIUC
为 UIUC 地质系购置激光烧蚀系统
  • 批准号:
    1441465
  • 财政年份:
    2014
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Collaborative Research: Investigating MORB differentiation through non-traditional stable isotope analyses
合作研究:通过非传统稳定同位素分析研究 MORB 分化
  • 批准号:
    1060754
  • 财政年份:
    2011
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Collaborative Proposal: Integrated Investigations of Isotope Fractionation in Magmatic Systems
合作提案:岩浆系统中同位素分馏的综合研究
  • 批准号:
    1019632
  • 财政年份:
    2010
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
EAGER: Collaborative Research: Collaborative Investigations of Isotopic Fractionation by Thermal Diffusion and Thermal Migration
EAGER:协作研究:通过热扩散和热迁移进行同位素分馏的协作研究
  • 批准号:
    0944169
  • 财政年份:
    2009
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Collaborative Research: Probing mantle plumbing beneath Pacific ridges thriugh study of the Lamont and Vance Seamount chains
合作研究:通过拉蒙特海山链和万斯海山链的研究来探测太平洋海脊下的地幔管道
  • 批准号:
    0825612
  • 财政年份:
    2008
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Assessing Diffusive Differentiation During Igneous Intrusion Using Integrated Theoretical, Experimental and Field Studies
利用综合理论、实验和现场研究评估火成岩侵入过程中的扩散分异
  • 批准号:
    0609726
  • 财政年份:
    2006
  • 资助金额:
    $ 21万
  • 项目类别:
    Continuing Grant
Collaborative Research: Investigating the Processes and Timescales of Andesite Differentiation: A Comprehensive Petrological and Geochemical Study of Arenal Volcano, Costa Rica
合作研究:调查安山岩分异的过程和时间尺度:哥斯达黎加阿雷纳尔火山的综合岩石学和地球化学研究
  • 批准号:
    0207761
  • 财政年份:
    2002
  • 资助金额:
    $ 21万
  • 项目类别:
    Standard Grant
Observational Constraints on Melt-Rock Reactions during Melting of the Upper Mantle
上地幔熔融过程中熔岩反应的观测限制
  • 批准号:
    0096533
  • 财政年份:
    2001
  • 资助金额:
    $ 21万
  • 项目类别:
    Continuing Grant

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变暖时期热带有孔虫的生存策略:原位观测和中生态实验
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