CAREER: Redefining the high field strength element systematics of subduction systems using non-traditional stable isotopes

职业:使用非传统稳定同位素重新定义俯冲系统的高场强元素系统学

基本信息

  • 批准号:
    2143168
  • 负责人:
  • 金额:
    $ 67.96万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-02-01 至 2027-01-31
  • 项目状态:
    未结题

项目摘要

Reconstructing the nature of the geologic processes responsible for the evolution of our planet, including when and how continents formed and plate-tectonic cycles were established, has been a long-standing goal of Earth Scientists. Clues for answering these questions are ‘coded’ into the geochemistry of the ancient rock and mineral record, but interpreting these geochemical signatures is not always straightforward. Over billion-year timescales, the rocks that constitute Earth’s continents have been deformed and overprinted by younger geologic processes, significantly obscuring their original structural and chemical characteristics. In order to ‘see through’ this complex evolution, geoscientists use chemical signatures retained by elements that are not easily altered and/or remobilized, and thus that can provide clues into primary rock-forming processes despite subsequent overprinting. A group of elements particularly suited for these investigations are the so-called high-field strength elements (HFSE), a group of transition metals with unique geochemical characteristics which make them not only important to understand crust formation but also very resilient to alteration. In particular, the isotopic compositions of these elements, which can now be measured with great accuracy and precision, can provide unique glimpses into the geochemical processes taking place in convergent tectonic margins and during formation of continental crust. Nevertheless, making geologically meaningful interpretations from these data requires a robust understanding of the processes that control the observed isotopic signatures, and developing such framework is the central research goal this project will undertake.This CAREER project will leverage recent analytical developments in the field of non-traditional stable isotopes to i) conduct a detailed study of the mass-dependent isotope fractionations that characterize the HFSE titanium, zirconium, and hafnium in subduction environments; and ii) utilize these isotopic variations for better understanding the processes leading to their fractionation and fluxes during formation of continental crust. To achieve this, the research team will generate a series of combined Ti-Zr-Hf isotopic datasets from key geologic components and petrologic processes characterizing the ‘subduction factory’ and that are known to influence the chemistry of arc-related magmatic systems. Isotopic fractionations at the bulk-rock and mineral scales will be determined in various global localities of orogenic peridotites, mid ocean ridge basalts, high-pressure/low-temperature subduction complexes, lower-crustal arc cumulates, and arc-related basalts and differentiated volcanic rocks, to understand HFSE mass-transfer and isotopic fractionations across the entire subduction cycle. Samples will be measured using high-accuracy methods involving calibrated double-spikes and MC-ICP-MS measurements. In addition to the broader scientific impacts that will result from this research, the PI will develop educational activities that foster greater equity, diversity, and inclusivity within the Geosciences starting from a pre-college stage. These include the development of an afterschool bilingual program for Hispanic/Latinx high-school students in collaboration with the Tucson Unified School District (TUSD), active recruitment of URM undergraduates into meaningful research experiences, and training of diverse graduate students and postdocs. As a result of this project, the PI will also develop an accessible on-line resource for researchers and students interested in learning more about non-traditional stable isotopes, constructed with active student involvement.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
重建负责我们星球演变的地质过程的性质,包括建立何时以及如何建立持续序列和板岩循环,这是地球科学家的长期目标。回答这些问题的线索被“编码”到古代岩石和矿物记录的地球化学中,但是解释这些地球化学签名并不总是很简单。在数十亿年的时间尺度上,构成地球大陆的岩石已被年轻的地质过程变形和覆盖,大大掩盖了它们的原始结构和化学特征。为了“查看”这种复杂的进化,地球科学家使用不容易改变和/或去除的元素保留的化学特征,因此可以将线索提供到随后覆盖的主要岩石形成过程中。一组特别适合这些研究的元素是所谓的高场强度元素(HFSE),这是一组具有独特地球化学特征的过渡金属,这不仅使它们对于理解地壳形成,而且对改变的耐药性不仅重要。特别是,这些元素的同位素组合物现在可以精确和精确度进行测量,可以在收敛的构造缘和连续地壳形成过程中为地球化学过程提供独特的瞥见。尽管如此,从这些数据中做出地质上有意义的解释需要对控制观察到的同位素签名的过程有牢固的理解,而开发这种框架是该项目将实现的中心研究目标。该项目将在非交易稳定的同位素方面的最新分析性发展,以对i)进行详细的质量依赖的效果,以iiririm的质量依赖性效果,以示为irirpeptions。和俯冲环境中的hafnium; ii)利用这些同位素变化来更好地理解导致其分馏和在连续地壳形成过程中的分馏和通量的过程。为了实现这一目标,研究团队将从关键的地质组件和质量过程中产生一系列联合的TI-ZR-HF同位素数据集,这些数据集和岩石学过程表征了“俯冲厂”,并且已知会影响与ARC相关的岩浆系统的化学反应。将在散装岩体和次要尺度的同位素分馏中确定在各种全球山地橄榄岩,中海山脊,高压/低体温俯冲络合物,下壳弧形累积累积和与弧相关的底层和差异化的火山岩群中,以了解HFSE的群体和群体周期。样品将使用高准确的方法进行测量,涉及校准的双峰和MC-ICP-MS测量。除了这项研究将产生的更广泛的科学影响外,PI还将开发教育活动,从而从校长阶段开始地球科学内促进更大的平等,多样性和包容性。其中包括与图森统一学区(TUSD)合作的西班牙裔/拉丁裔高中生的课后双语计划,积极招募URM本科生从事有意义的研究经验,并培训了多样化的研究生研究生和博士学位。该项目的结果是,PI还将为有兴趣了解更多有关非传统稳定同位素的研究人员和学生开发可访问的在线资源,该奖项反映了NSF的法定任务,并被认为是通过使用该基金会的智力和更广泛影响的评估来审查Criteria来评估的支持,并被视为珍贵的支持。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Zirconium stable isotope fractionation during intra-crustal magmatic differentiation in an active continental arc
  • DOI:
    10.1016/j.gca.2023.11.023
  • 发表时间:
    2023-11
  • 期刊:
  • 影响因子:
    5
  • 作者:
    L. Zieman;M. Ibáñez-Mejia;F. Tissot;H. Tompkins;Natalia Pardo;E. Bloch
  • 通讯作者:
    L. Zieman;M. Ibáñez-Mejia;F. Tissot;H. Tompkins;Natalia Pardo;E. Bloch
Redox and mineral controls on Fe and Ti isotopic fractionations during calc-alkaline magmatic differentiation
  • DOI:
    10.1016/j.gca.2023.06.016
  • 发表时间:
    2023-08
  • 期刊:
  • 影响因子:
    5
  • 作者:
    Aleisha C. Johnson;Zhe J. Zhang;N. Dauphas;R. Rudnick;J. Foden;Magali Toc
  • 通讯作者:
    Aleisha C. Johnson;Zhe J. Zhang;N. Dauphas;R. Rudnick;J. Foden;Magali Toc
Zircon growth experiments reveal limited equilibrium Zr isotope fractionation in magmas
锆石生长实验揭示岩浆中有限平衡Zr同位素分馏
  • DOI:
    10.7185/geochemlet.2310
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    4.9
  • 作者:
    Tompkins, H.G.D.;Ibañez-Mejia, M.;Tissot, F.L.H.;Bloch, E.;Wang, Y.;Trail, D.
  • 通讯作者:
    Trail, D.
A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169
由社区主导的 Zr 同位素参考材料校准:NIST 候选 RM 8299 和 SRM 3169
  • DOI:
    10.1039/d3ja00167a
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    Tissot, François L.;Ibañez-Mejia, Mauricio;Rabb, Savelas A.;Kraft, Rebecca A.;Vocke, Robert D.;Fehr, Manuela A.;Schönbächler, Maria;Tang, Haolan;Young, Edward D.
  • 通讯作者:
    Young, Edward D.
High-precision zirconium isotope analysis of Pacific seawater reveals large mass-dependent fractionations in the ocean
  • DOI:
    10.1016/j.gca.2023.11.018
  • 发表时间:
    2023-11
  • 期刊:
  • 影响因子:
    5
  • 作者:
    Linqing Huang;F. Tissot;M. Ibáñez-Mejia;K. Forsch;Carli Arendt;C. Anela Choy;Sarah M. Aarons
  • 通讯作者:
    Linqing Huang;F. Tissot;M. Ibáñez-Mejia;K. Forsch;Carli Arendt;C. Anela Choy;Sarah M. Aarons
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Mauricio Ibanez-Mejia其他文献

Mauricio Ibanez-Mejia的其他文献

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{{ truncateString('Mauricio Ibanez-Mejia', 18)}}的其他基金

Collaborative Research: Improved Geochronology-Based Sediment Provenance Analysis Through Physico-Mechanical Characterization of Zircon Transport
合作研究:通过锆石运移的物理机械表征改进基于地质年代学的沉积物物源分析
  • 批准号:
    2314016
  • 财政年份:
    2023
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Standard Grant
MRI: Acquisition of a Multicollector – Inductively Coupled Plasma – Mass Spectrometer at the University of Arizona for Earth and Planetary Science Research, Education and Outre
MRI:在亚利桑那大学购买多接收器 — 电感耦合等离子体 — 质谱仪,用于地球和行星科学研究、教育和外展
  • 批准号:
    2214700
  • 财政年份:
    2022
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Standard Grant
Collaborative Research: The Zirconium Isotope Composition and Variability of the Silicate Earth -- A Pilot Study
合作研究:硅酸盐地球的锆同位素组成和变化——一项试点研究
  • 批准号:
    2131632
  • 财政年份:
    2021
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Continuing Grant
Collaborative Research: Caught in the Act- The Petrology of Modern Lower-Crust Formation and Foundering in the North Andean Arc
合作研究:陷入困境——北安第斯弧现代下地壳形成和沉没的岩石学
  • 批准号:
    2131643
  • 财政年份:
    2021
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Standard Grant
Collaborative Research: Improved Geochronology-Based Sediment Provenance Analysis Through Physico-Mechanical Characterization of Zircon Transport
合作研究:通过锆石运移的物理机械表征改进基于地质年代学的沉积物物源分析
  • 批准号:
    1946538
  • 财政年份:
    2020
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Standard Grant
Collaborative Research: Caught in the Act- The Petrology of Modern Lower-Crust Formation and Foundering in the North Andean Arc
合作研究:陷入困境——北安第斯弧现代下地壳形成和沉没的岩石学
  • 批准号:
    1926124
  • 财政年份:
    2019
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Standard Grant
Collaborative Research: The Zirconium Isotope Composition and Variability of the Silicate Earth -- A Pilot Study
合作研究:硅酸盐地球的锆同位素组成和变化——一项试点研究
  • 批准号:
    1823748
  • 财政年份:
    2018
  • 资助金额:
    $ 67.96万
  • 项目类别:
    Continuing Grant

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普朗克常数的精密测量及质量单位千克的重新定义
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