Collaborative Research: Evolution of an Early Enriched Reservoir in the Northern Wyoming Province: Evidence from Ancient Zircons
合作研究:怀俄明州北部早期富集储层的演化:来自古代锆石的证据
基本信息
- 批准号:0609952
- 负责人:
- 金额:$ 17.4万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2007
- 资助国家:美国
- 起止时间:2007-02-01 至 2014-01-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Intellectual Merit. Constraining the size, spatial distribution, and extent of elemental fractionation that characterized both depleted and enriched geochemical reservoirs in the early Earth has been a fundamental long-term goal of terrestrial and planetary geochemists. For the Sm-Nd and Lu-Hf systems, crust-mantle evolution subsequent to 2.5 Ga has been viewed in terms of a generally monotonic increases in the radiogenic daughter isotopes within the mantle that reflects extraction of continental crust to produce a 'melt'-depleted upper mantle reservoir characterized by parent/daughter ratios that are greater than the values for the bulk silicate earth. The complementary enriched reservoir over this interval is the continental crust. However, for the earliest 4.5 to 2.5 Ga of Earth history, the rock record is more difficult to decipher - in part owing to limited exposures of rocks this old. Available data indicate that crust-mantle evolution in this period may have been quite different in terms of melt-extraction processes, leading to 'anomalous' departures from the younger Nd-Hf isotopic record. Recently, analysis of Lu-Hf systematics in old, well-preserved zircons have provided a new approach to resolving isotopic records for early earth evolution. This approach will be used to gain insights into the development of Earth's early enriched reservoirs through analysis of a suite of 3.2 to 4.0 Ga zircons preserved in both metasedimentary and metaigneous rocks from the northern Wyoming Province. The proposed research will consist of 3 primary components: [1] U-Pb dating and trace element analyses via ion probe (SHRIMP-RG), [2] finer scale elemental analyses and imaging via electron probe, and [3] measurement of Lu-Hf systematics via LA-ICP-MS on dated portions of individual zircons. The PIs have previously documented the antiquity of the crust in this region, and argued that understanding its evolution will provide fundamental insights into the early geochemical differentiation of the Earth. Broader Impacts. This project will involve training of graduate students and post-doctoral researchers in geologic and analytical skills that will serve in future research and/or private sector employment. Undergraduate students will also be involved in this project - introducing them to methods of geologic research. Prior research results of this group have been included in popular books and in educational displays at the American Museum of Natural History (e.g., "The Earth Inside and Out", Gottesman's Hall of Planet Earth exhibit). Likewise, the proposed research will also be incorporated into formal and informal education and outreach. An example is provided by the "pet rock" approach utilized for petrology instruction at LSU. All results of this research will be disseminated via traditional presentations at professional meetings and peer reviewed publications.
智力优点。限制早期地球贫化和富集地球化学储层特征的元素分馏的大小、空间分布和程度,一直是陆地和行星地球化学家的基本长期目标。对于 Sm-Nd 和 Lu-Hf 系统,2.5 Ga 之后的壳幔演化被视为地幔内放射成因子同位素的总体单调增加,这反映了大陆地壳的提取以产生“熔化”。枯竭的上地幔储层,其特征是母体/子体比率大于块状硅酸盐地球的值。该区间的补充富集储层是大陆地壳。然而,对于地球历史上最早的 4.5 至 2.5 Ga,岩石记录更难以破译——部分原因是如此古老的岩石暴露有限。现有数据表明,这一时期的壳幔演化在熔体萃取过程方面可能有很大不同,导致与较年轻的 Nd-Hf 同位素记录的“异常”偏离。 最近,对保存完好的古老锆石中的 Lu-Hf 系统学分析为解析早期地球演化的同位素记录提供了一种新方法。该方法将用于通过分析保存在怀俄明州北部变沉积岩和变火成岩中的一组 3.2 至 4.0 Ga 锆石,深入了解地球早期富集储层的发育情况。拟议的研究将由 3 个主要部分组成:[1] 通过离子探针 (SHRIMP-RG) 进行 U-Pb 定年和痕量元素分析,[2] 通过电子探针进行更精细的元素分析和成像,以及 [3] Lu 的测量-通过 LA-ICP-MS 对单个锆石的约会部分进行 Hf 系统分析。 PI 此前已经记录了该地区地壳的古老情况,并认为了解其演化将为地球早期地球化学分异提供基本见解。更广泛的影响。该项目将涉及对研究生和博士后研究人员进行地质和分析技能培训,这些技能将服务于未来的研究和/或私营部门就业。本科生也将参与这个项目——向他们介绍地质研究的方法。该小组之前的研究成果已被收录在流行书籍和美国自然历史博物馆的教育展览中(例如“地球的内部和外部”,戈特斯曼的地球大厅展览)。同样,拟议的研究也将纳入正式和非正式的教育和推广。路易斯安那州立大学用于岩石学教学的“宠物岩石”方法就是一个例子。这项研究的所有结果将通过专业会议上的传统演示和同行评审出版物进行传播。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Paul Mueller其他文献
Paul Mueller的其他文献
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{{ truncateString('Paul Mueller', 18)}}的其他基金
Collaborative Research: Age, Petrology, and Tectonic Setting of Purported Taconic-aged plutons, Ashland-Wedowee-Emuckfaw Belt, Southern Appalachians
合作研究:南阿巴拉契亚山脉阿什兰-Wedowee-Emuckfaw 带的据称塔科尼年龄岩体的年龄、岩石学和构造环境
- 批准号:
1220532 - 财政年份:2012
- 资助金额:
$ 17.4万 - 项目类别:
Continuing Grant
Collaborative Research: Precambrian Crustal Evolution in Western Laurentia: Implications from the Sawtooth Metamorphic Complex
合作研究:西劳伦西亚前寒武纪地壳演化:锯齿变质杂岩的影响
- 批准号:
1145212 - 财政年份:2012
- 资助金额:
$ 17.4万 - 项目类别:
Continuing Grant
Collaborative Research: Geochemical Imaging of Post-Pangean Lithospheric Structure in the Southern Appalachians
合作研究:阿巴拉契亚山脉南部后盘古大陆岩石圈结构的地球化学成像
- 批准号:
1053465 - 财政年份:2011
- 资助金额:
$ 17.4万 - 项目类别:
Continuing Grant
Collaborative Research: REU Site Project--Evolution of Precambrian Rocks in Yellowstone National Park
合作研究:REU现场项目——黄石国家公园前寒武纪岩石的演化
- 批准号:
0851752 - 财政年份:2009
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
Development of a 4-D Model of Crustal Evolution in the Northern Rocky Mountains
落基山脉北部地壳演化 4 维模型的开发
- 批准号:
0545751 - 财政年份:2006
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
Evolution of the SW Laurentian Margin: Implications for Proterozoic Crustal Growth and Geodynamics
西南劳伦斯边缘的演化:对元古代地壳生长和地球动力学的影响
- 批准号:
0538133 - 财政年份:2006
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
Collaborative Research: Workshop for Integrated EarthScope Research and Education in the Northern Rocky Mountains
合作研究:落基山脉北部综合 EarthScope 研究和教育研讨会
- 批准号:
0346182 - 财政年份:2004
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
Technical Support for a New ICP-MS Laboratory for Earth and Ocean Science Research at the University of Florida
为佛罗里达大学地球和海洋科学研究新 ICP-MS 实验室提供技术支持
- 批准号:
0418905 - 财政年份:2004
- 资助金额:
$ 17.4万 - 项目类别:
Continuing Grant
Origin and Evolution of the Great Falls Tectonic Zone: Implications for the Assembly of Southern Laurentia and Rodinian Connections
大瀑布构造带的起源和演化:对南劳伦西亚和罗迪尼亚连接组合的影响
- 批准号:
0106592 - 财政年份:2001
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
Acquisition of a New TIMS for Ocean and Earth Sciences at the University of Florida
佛罗里达大学购买新的海洋和地球科学 TIMS
- 批准号:
9601872 - 财政年份:1996
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
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