40Ar/39Ar K-feldspar Thermochronology: Exploring Argon Transport

40Ar/39Ar 钾长石热年代学:探索氩传输

基本信息

项目摘要

Intellectual Merit: The growing use of K-feldspar 40Ar/39Ar thermochronology requires continued evaluation of the methods and understanding of the controls for argon transport. Better understanding of how microtextures correspond to or control argon transport is key to all applications of K-feldspar thermochronology. Considering the growing worldwide use of the method it is important to further understanding of the mechanisms of and boundaries for argon transport.The complex relationship between argon systematics and microtextures of K-feldspar have been explained in terms of a multi-diffusion domain (MDD) model, in which Ar retention and release is controlled by heterogeneous structural domains in crystals. Based on extensive analytical data, this model seems viable for some but not all K-feldspars. A collaborative study is proposed to integrate isotopic analysis with mineralogical characterization of samples to elucidate the causes for this varied behavior. Both natural and experimentally produced feldspars will be studied to evaluate Ar transport pathways out of K-feldspar. A unique strength of this project is that the two PIs bring different, synergistic, and partially conflicting perspectives. Heizler has amassed an extensive database that combines K-feldspar data and thermochronologic models within the context of numerous independent geologic constraints; Parsons has been involved in some aspects of argon geochronology, worked extensively on experimental studies of K-feldspar mineralogy, and has challenged the MDD model. Both recognize that it is essential to combine ideas and philosophies towards the common goal of better understanding K-feldspar argon systematics and the utility of K-feldspar thermochronology. On-going K-feldspar MDD thermochronology from throughout the western USA has revealed some important regional insights that can evolve towards regional and process-oriented breakthroughs if the complexities of the dataset can be better understood. Results so far indicate: 1) a 'Great Unconformity' was the product of at least two major episodes of exhumation that coincide with the ca. 1.1 Ga Grenville orogeny and the ca. 800 Ma rifting of Rodinia; 2) Discordant ages are recognized across some faults that allow determination of the timing of fault initiation and reactivation; 3) Periods of punctuated hydrothermal K-feldspar growth appear to correlate to tectonic episodes. Refinement of emerging interpretations and hypotheses needs to be done within study areas with ample supporting data. PI Heizler provides experience in this area. Involvement of PI Parsons brings extensive knowledge of K-feldspar microtextures that will facilitate evaluation of the K-feldspar thermochronology. He will supervise grain-imaging analyses, document microtextures, evaluate secondary Kfeldspar growth and help with microsampling techniques of different mineralogical domains for argon analysis.Broader Impacts: Because K-feldspar thermochronology has wide application to relevant societal issues such as geothermal resources, ore deposits, petroleum resource assessment and volcanic hazards, continued evaluation of the method is critical. This proposal will support training of a graduate student, foster the cross-training of both PIs - notably providing PI Heizler an opportunity to learn fundamentals of K-feldspar characterization and interpretation of microtextures. The western USA effort is part of a broad collaboration that involves numerous NSF PIs and dozens of graduate and undergraduate students from a variety of institutions who seek to enhance their ability to interpret 40Ar/39Ar data. This project will be integrated with and will impact this larger effort.
智力优势:越来越多地使用钾长石40 Ar/39 Ar热年代学需要继续评价的方法和理解的控制氩输运。更好地理解显微结构如何对应或控制氩的传输是关键的所有应用的钾长石热年代学。考虑到Ar输运方法在世界范围内的广泛应用,进一步了解Ar输运的机制和边界是非常重要的,本文用多扩散域(MDD)模型解释了Ar系统与钾长石显微结构之间的复杂关系,其中Ar的滞留和释放受晶体中的非均匀结构域控制。 基于大量的分析数据,该模型似乎对某些但不是所有的K型翼梁都是可行的。一项合作研究,建议整合同位素分析与矿物学表征的样品,以阐明这种不同的行为的原因。 天然和实验产生的长石将进行研究,以评估氩运输途径的钾长石。这个项目的一个独特优势是,两个PI带来了不同的,协同的,部分冲突的观点。海茨勒积累了一个广泛的数据库,结合钾长石数据和热年代学模型的背景下,许多独立的地质约束;帕森斯一直参与氩地质年代学的某些方面,广泛的工作在钾长石矿物学的实验研究,并提出了挑战MDD模型。两者都认识到,为了更好地理解钾长石氩系统学和钾长石热年代学的效用这一共同目标,必须将联合收割机的思想和哲学结合起来。来自美国西部的正在进行的钾长石MDD热年代学揭示了一些重要的区域见解,如果能够更好地理解数据集的复杂性,这些见解可以朝着区域和过程导向的突破发展。迄今为止的研究结果表明:1)一个“大不整合面”是至少两个主要的剥露事件的产物,与该事件相吻合。1.1加格伦维尔奥伦维尔和ca。800马裂谷的Rodinia; 2)不一致的年龄被确认在一些故障,允许确定的时间断层的启动和复活; 3)间歇热液钾长石生长的时期似乎与构造事件。新出现的解释和假设需要在有充分支持数据的研究领域内进行完善。PI Heizler提供了这方面的经验。PI Parsons的参与带来了对钾长石微观结构的广泛了解,这将有助于钾长石热年代学的评估。他将监督颗粒成像分析,记录显微结构,评估次生钾长石生长,并帮助不同矿物学领域的微量取样技术进行氩分析。更广泛的影响:由于钾长石热年代学在地热资源、矿床、石油资源评估和火山灾害等相关社会问题上有着广泛的应用,因此对该方法的持续评估至关重要。该提案将支持研究生的培训,促进两个PI的交叉培训-特别是为PI Heizler提供学习钾长石表征和微观结构解释的基础知识的机会。美国西部的努力是广泛合作的一部分,涉及众多NSF PI和来自各种机构的数十名研究生和本科生,他们寻求提高他们解释40 Ar/39 Ar数据的能力。该项目将与这一更大的努力相结合,并将影响这一更大的努力。

项目成果

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Matthew Heizler其他文献

Matthew Heizler的其他文献

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{{ truncateString('Matthew Heizler', 18)}}的其他基金

MRI: Acquisition of 40Ar/39Ar Facilities at NM Tech
MRI:在 NM Tech 收购 40Ar/39Ar 设施
  • 批准号:
    0723256
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Investigation of Biotite/Sanidine Age Discordance
黑云母/Sanidine 年龄不一致的调查
  • 批准号:
    0126144
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Collaborative Research: Mesoproterozoic Tectonics of Inboard Laurentia: Insight Into Assembly and Configuration of Rodinia
合作研究:劳伦西亚内侧的中元古代构造:洞察罗迪尼亚的组装和配置
  • 批准号:
    0208323
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Collaborative Research: Lithospheric Structure and Evolution of the Rocky Mountains - beginning Phase 2 Geodynamic Processes
合作研究:落基山脉的岩石圈结构和演化——第二阶段地球动力学过程的开始
  • 批准号:
    0003536
  • 财政年份:
    2001
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Collaborative Research: Great Unconformity of the Southwestern U.S.A. -- Ar-Ar K-Feldspar Thermochronologic and Structural Studies of a Billion Years of Regional Exhumation
合作研究:美国西南部大不整合面——十亿年区域剥露的Ar-Ar钾长石热年代学和结构研究
  • 批准号:
    9903298
  • 财政年份:
    1999
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Acquisition of a UV Laser Ablation System for 40Ar/39Ar Research
采购用于 40Ar/39Ar 研究的紫外激光烧蚀系统
  • 批准号:
    9706062
  • 财政年份:
    1997
  • 资助金额:
    --
  • 项目类别:
    Standard Grant

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  • 批准号:
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  • 批准号:
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角闪石过剩40Ar赋存状态与40Ar/39Ar年代学研究
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    2014
  • 资助金额:
    25.0 万元
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    青年科学基金项目

相似海外基金

Development and application of 40Ar/39Ar dating methods for young volcanic rocks
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    2102788
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