Laboratory Measurements of Trace Element Partition Coefficients Between Zircon, Aqueous Fluid and Silicate Melt at High and Ultrahigh Pressures

高压和超高压下锆石、水溶液和硅酸盐熔体之间微量元素分配系数的实验室测量

基本信息

  • 批准号:
    0838391
  • 负责人:
  • 金额:
    $ 26.1万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2009
  • 资助国家:
    美国
  • 起止时间:
    2009-06-01 至 2012-05-31
  • 项目状态:
    已结题

项目摘要

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Laboratory Measurements of Trace Element Partition Coefficients Between Zircon, Aqueous Fluid and Silicate Melt at High and Ultrahigh PressuresIntellectual Merit. Although zircon is widely used for dating geologic events and identifying the source (mantle versus recycled crust) of crustal rocks, it has not been developed as a tool for characterizing fluid-rock interaction. Zircon could potentially be used to date fluid infiltration events and estimate the trace element composition of fluids. This would be particularly useful for evaluating the role of fluids in the formation of High- and Ultrahigh-Pressure (HP and UHP) rocks that typically form in subduction zones. Laboratory experiments are proposed to characterize the behavior of zircon in the presence of aqueous fluids and silicate melts. D(zircon/fluid) partition coefficients will be measured for P, Na, Ca, Mg, Sc, Sr, Y, Nb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb, Lu, Hf, Pb, Th and U at 1.5-3.5 GPa. In subsolidus synthesis (forward) experiments at 800-1100°C the assemblages zircon + quartz and zircon + baddeleyite will be equilibrated with various fluid compositions (H2O, 1m NaOH, 1m HCl) at fO2 = NNO to allow measurement of zircon aqueous solubility and D(zircon/fluid) values. D(zircon/fluid) values measured in recrystallization (reversal) experiments at similar conditions will be used to test for equilibrium. Measured D(zircon/fluid) values will be compared with D(zircon/melt) values recently measured at the same conditions to identify the distinctive features of the trace element patterns of hydrothermal and magmatic zircons. Supersolidus experiments at 1000-1200°C in which zircon, melt and aqueous fluid are equilibrated will allow simultaneous measurement of D(melt/fluid), D(zircon/melt), and D(zircon/fluid) for all 25 trace elements. These values will be compared with D(zircon/melt) and D(zircon/fluid) values measured at the same conditions using other methods to check for internal consistency. The applicability of lattice strain theory to mineral/fluid systems will also be tested. Characterizing the trace element signatures of magmatic and hydrothermal zircons will allow for more accurate identification of hydrothermal zircons and interpretation of zircon U-Pb ages measured in-situ. Measured D(zircon/fluid) and D(zircon/melt) values can be used to estimate compositions of fluids and melts that equilibrated with zircons in subducting slabs or other HP-UHP settings. Zircon partition coefficients will enable more accurate classification of 'out of context' zircons, including Hadean detrital and xenocrystic zircons, some of which have been shown to contain diamond inclusions, and can be used to calculate the composition of the source rock (e.g., REE pattern) and to identify by analogy the type of source (crust vs. mantle, granite vs. tonalite).Broader Impacts. This project will fund one post-doctoral researcher, one current Vanderbilt Ph.D. student, 1-2 future M.S. or Ph.D. students, and 1-2 undergraduate students. It will also fund the research of 1-2 high school students through a research internship program that the P.I. is involved in. Results will be presented by the P.I. and students at national and international meetings and in journal publications. The P.I. will continue outreach activities such as primary school presentations and publication of popular accounts of his research. He has written or contributed to three popular articles about his research in the last two years.
“该奖项是根据2009年美国复苏和再投资法案(公法111-5)资助的。“高压和超高压下锆石、含水流体和硅酸盐熔体之间微量元素分配系数的实验室测量。虽然锆石被广泛用于确定地质事件的年代和确定地壳岩石的来源(地幔与再生地壳),但它还没有被开发为表征流体-岩石相互作用的工具。锆石可能被用来确定流体渗透事件的日期,并估计流体的微量元素组成。这对于评估流体在高压和超高压(HP和UHP)岩石形成中的作用特别有用,这些岩石通常形成于俯冲带。通过室内实验研究了锆石在水溶液和硅酸盐熔体中的行为。在1.5- 3.5GPa压力下,测量P、Na、Ca、Mg、Sc、Sr、Y、Nb、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Er、Tm、Yb、Lu、Hf、Pb、Th和U的D(锆石/流体)分配系数。在800-1100°C下的亚固相线合成(正向)实验中,锆石+石英和锆石+斜锆石组合物将在fO 2 = NNO下用各种流体组合物(H2O、1 m NaOH、1 m HCl)平衡,以允许测量锆石水溶解度和D(锆石/流体)值。在类似条件下的重结晶(逆转)实验中测得的D(锆石/流体)值将用于测试平衡。测量的D(锆石/流体)值将与最近在相同条件下测量的D(锆石/熔体)值进行比较,以确定热液和岩浆锆石微量元素模式的独特特征。在1000-1200°C下的超固相线实验(其中锆石、熔体和含水流体平衡)将允许同时测量所有25种微量元素的D(熔体/流体)、D(锆石/熔体)和D(锆石/流体)。将这些值与使用其他方法在相同条件下测量的D(锆石/熔体)和D(锆石/流体)值进行比较,以检查内部一致性。晶格应变理论的矿物/流体系统的适用性也将进行测试。对岩浆和热液锆石的微量元素特征进行表征,将有助于更准确地识别热液锆石和解释现场测得的锆石U-Pb年龄。测量的D(锆石/流体)和D(锆石/熔体)值可用于估计在俯冲板或其他HP-UHP设置中与锆石平衡的流体和熔体的组成。锆石分配系数将能够更准确地分类“脱离上下文”的锆石,包括冥古宙碎屑和捕虏晶锆石,其中一些已被证明含有金刚石夹杂物,并可用于计算源岩的组成(例如,稀土元素模式),并通过类比确定来源类型(地壳与地幔,花岗岩与英云闪长岩)。该项目将资助一名博士后研究员,一名现任范德比尔特博士。学生,1-2个未来的M.S.或博士学生,1-2名本科生。它还将通过一个研究实习项目资助1-2名高中生的研究。参与其中结果将由P.I.提供。以及学生参加国家和国际会议以及期刊出版物。私家侦探将继续开展外展活动,如小学演讲和出版他的研究的流行帐户。在过去的两年里,他撰写或撰写了三篇关于他的研究的热门文章。

项目成果

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John Ayers其他文献

T25 - Availability of Cannabinoid Products in Online Vape Shops
T25 - 在线蒸汽烟商店中大麻素产品的可用性
  • DOI:
    10.1016/j.drugalcdep.2024.111793
  • 发表时间:
    2025-02-01
  • 期刊:
  • 影响因子:
    3.600
  • 作者:
    Nora Satybaldiyeva;Raquel Harati;Tomas Mejorado;Nick Morales;Shannon Ellis;John Ayers;Eric Leas
  • 通讯作者:
    Eric Leas
Chinese Ceramics In The Topkapi Saray Museum, Istanbul: A Complete Catalogue
伊斯坦布尔托普卡帕萨拉博物馆的中国陶瓷:完整目录
  • DOI:
  • 发表时间:
    1986
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Topkapı Sarayı Müzesi;R. Krahl;Nurdan Erbahar;John Ayers
  • 通讯作者:
    John Ayers
A multimodal analysis of degradation processes in 10W PV panels under thermal and mechanical stress
对10W光伏板在热应力和机械应力下退化过程的多模态分析
  • DOI:
    10.1016/j.solmat.2025.113617
  • 发表时间:
    2025-08-01
  • 期刊:
  • 影响因子:
    6.300
  • 作者:
    Iram Sifat;Kallol Biswas;John Ayers;Sung-Yeul Park;Alexander G. Agrios
  • 通讯作者:
    Alexander G. Agrios

John Ayers的其他文献

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

Collaborative Research: Probing zircon reactivity in aqueous solutions at solubility equilibrium using isotope tracers
合作研究:使用同位素示踪剂探测处于溶解度平衡的水溶液中锆石的反应性
  • 批准号:
    2221906
  • 财政年份:
    2022
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant
Zr-Mineral Aqueous Solubilities and Zircon/(Fluid-Melt) Partitioning
锆矿物的水溶解度和锆石/(流体熔体)分配
  • 批准号:
    0510092
  • 财政年份:
    2005
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Continuing Grant
Monazite as a Sensitive Indicator of the Timing and Type of Fluid Activity During Metamorphism
独居石作为变质作用过程中流体活动时间和类型的敏感指标
  • 批准号:
    0126020
  • 财政年份:
    2002
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Continuing Grant
Patterned Heteroepitaxial Processing: A New Approach to Mismatched Heteroepitaxy for the Fabrication of High-Performance Semiconductor Devices
图案化异质外延加工:一种用于制造高性能半导体器件的失配异质外延的新方法
  • 批准号:
    9905874
  • 财政年份:
    1999
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant
Reliability Study of Oxidized Deposited Polysilicon (ODP) Gate Oxide for Silicon Carbide Power Transistors
碳化硅功率晶体管氧化沉积多晶硅 (ODP) 栅极氧化物的可靠性研究
  • 批准号:
    9906543
  • 财政年份:
    1999
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant
Laboratory and Field Investigations of Monazite Paragenesis, Growth Kinetics, Textural Development, and U-Th-Pb Chronometry in Igneous and High-Grade Metamorphic Rocks
火成岩和高品位变质岩中独居石共生、生长动力学、结构发育和 U-Th-Pb 测时的实验室和现场研究
  • 批准号:
    9873626
  • 财政年份:
    1999
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant
Experimental Investigation of the Stability and Aqueous Solubility of Ti and Zr-rich Minerals: Implications for HFSE Mobilities in Subduction Zones
富钛和富锆矿物稳定性和水溶性的实验研究:对俯冲带 HFSE 迁移率的影响
  • 批准号:
    9317105
  • 财政年份:
    1994
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant
Research Initiation Award: "New Approaches to the Fabrication of Blue Semiconductor Laser Diodes by Vapor Phase Epitaxy"
研究启动奖:“气相外延制造蓝色半导体激光二极管的新方法”
  • 批准号:
    9309079
  • 财政年份:
    1993
  • 资助金额:
    $ 26.1万
  • 项目类别:
    Standard Grant

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