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

基本信息

  • 批准号:
    0538133
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2006
  • 资助国家:
    美国
  • 起止时间:
    2006-02-01 至 2010-01-31
  • 项目状态:
    已结题

项目摘要

This research is directed at improving our understanding of the formation and dispersal of the Laurentian (ancestral North America) supercontinent and the relationship between these events and the episodic generation and preservation of continental crust along its southwestern margin. The southwestern margin of Laurentia is globally unique because it contains remnants of a former Archean microcontinent (Wyoming province) and two distinct Paleoproterozoic orogenic events at 1.6-1.9 billion years ago and 2.2-2.5 billion years ago, which produced new continental crust. Formation of Laurentia in the Paleoproterozoic coincides with a global period of exceptionally rapid growth of juvenile crust and aggregation of existing micrcontinents and arcs during the late Paleoproterozoic (1.6-2.0 billion years ago). This period of rapid growth was preceded, however, by a global period (2.0-2.5 billion years ago) with a pronounced paucity of preserved crust. Crust generated during this interval is less commonly preserved than crust from periods preceding and succeeding it in the global rock record. In addition, such crust is unevenly distributed among the modern continents. It is more commonly preserved in modern southern hemisphere continents, making its presence along the southwest Laurentian margin unique. To complete this research scientists from the University of Florida are conducting a detailed and integrated geochemical and structural/tectonic investigation of both the early and late Paleoproterozoic rocks preserved along a part of the southwestern margin of Laurentia. This is being accomplished by geologic mapping in two critical areas, the Highland Mountains of Montana and the Wasatch Mountains of Utah, which form the basis for sampling this crust for chemical, isotopic, and petrologic studies. This work is leading to more complete understanding of the ages and origins of crust and lithosphere generated during the Paleoproterozoic and will provide critical and unique insight into the global scale problem of low crustal production rates in the early Paleoproterozoic vs. much higher rates characteristic of the late Proterozoic and late Archean. These data are also providing new constraints on the relationship between supercontinent cycles and changes in crustal growth rates and a specific test of Proterozoic geodynamic models based on assumptions that certain features such as the Diamantina lineament of Australia or Aekit terrane in Siberia share a common geologic history with the Great Falls tectonic zone and, therefore, represent a combined feature that transects the Neoproterozoic margin of Laurentia. In addition to the core science objectives, project funds are supporting undergraduate, graduate, and post-doctoral students by providing opportunities for their participation in various aspects of the research that is enhancing their mapping, sample preparation, analytical, and interpretive skills important to their professional development and employability. The research is benefiting from an established cooperative agreement to aid in supporting new undergraduate field research program supported by both the Keck Foundation and the National Science Foundation. The research is also being coordinated with an ongoing a U.S. Geological Survey mineral resources project (Metallogenic Evolution of Mesoproterozoic Sedimentary Rocks in Idaho and Montana) that is dependent on an accurate assessment of the age and distribution on pre-existing continental crust, such as that targeted in this project. On a longer time frame, this research will provide valuable input to decisions made for the NSF-sponsored EarthScope research project. When complete, the results of the research will be integrated into an on-line map that will allow both technically oriented individuals as well as the general public to see how the results from this research related to existing data from this region and elsewhere. Results of this research also are being made available through peer-reviewed scientific journals, on-line global databases, and presentations at professional society meetings.
这项研究旨在提高我们的理解的形成和分散的劳伦(北美祖先)超大陆和这些事件之间的关系和幕式生成和保存大陆地壳沿着其西南边缘。 劳伦大陆的西南边缘是全球独一无二的,因为它包含了前太古代微大陆(怀俄明州省)的残留物,以及两个不同的古元古代造山事件,分别发生在16 - 19亿年前和22 - 25亿年前,产生了新的大陆地壳。 劳伦提斯在古元古代的形成与古元古代晚期(16 - 20亿年前)全球幼年地壳异常快速生长和现有微大陆和弧聚集的时期相吻合。 然而,在这一快速增长时期之前,有一个全球性的时期(20亿至25亿年前),保存的地壳明显缺乏。 在全球岩石记录中,这一时期生成的地壳比其之前和之后时期的地壳保存得更少。 此外,这种地壳在现代大陆之间的分布也不均匀。 它更常见于现代南半球大陆,使其存在沿着西南劳伦特边缘独特。 为了完成这项研究,来自佛罗里达大学的科学家们正在对沿着劳伦大陆西南边缘保存的早、晚古元古代岩石进行详细的、综合的地球化学和结构/构造调查。 这是通过在两个关键地区进行地质测绘来完成的,这两个地区是蒙大拿州的高地山脉和犹他州的瓦萨奇山脉,它们构成了对地壳进行化学、同位素和岩石学研究的基础。 这项工作将导致更完整的了解古元古代期间产生的地壳和岩石圈的年龄和起源,并将提供关键和独特的洞察力,以全球范围内的问题,即古元古代早期地壳生产率低,而晚元古代和晚太古代的高得多的速率特征。 这些数据也提供了新的限制之间的关系超大陆的周期和地壳生长速度的变化和一个特定的测试元古代地球动力学模型的基础上的假设,某些功能,如迪亚曼蒂纳线性构造的澳大利亚或Aekit的西伯利亚有一个共同的地质历史与大福尔斯构造带,因此,代表了一个组合功能,横切新元古代边缘的劳伦。除了核心科学目标外,项目资金还支持本科生,研究生和博士后学生,为他们提供参与研究各个方面的机会,提高他们的绘图,样品制备,分析和解释技能,这对他们的专业发展和就业能力至关重要。 这项研究受益于一项既定的合作协议,以帮助支持由凯克基金会和国家科学基金会支持的新的本科生实地研究计划。这项研究还与正在进行的美国地质调查局矿产资源项目(爱达荷州和蒙大拿州中元古代沉积岩的成矿演化)协调进行,该项目依赖于对预先存在的大陆地壳的年龄和分布的准确评估,例如本项目所针对的。 在较长的时间范围内,这项研究将为NSF赞助的EarthScope研究项目的决策提供有价值的投入。 完成后,研究结果将整合到在线地图中,使技术导向的个人和公众都能看到这项研究的结果如何与该地区和其他地方的现有数据相关。 这项研究的结果也通过同行评审的科学期刊,在线全球数据库和专业协会会议上的演讲提供。

项目成果

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Paul Mueller其他文献

Specification and Characteristics of Surrogate Decision Makers: A Comparison of US State Statutes
  • DOI:
    10.1016/j.chest.2016.08.1054
  • 发表时间:
    2016-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Erin DeMartino;David Dudzinski;Cavan Doyle;Beau Sperry;Daniel Kramer;Daniel Sulmasy;Paul Mueller
  • 通讯作者:
    Paul Mueller
Hospice and Palliative Medicine Clinicians' Attitudes Towards Left Ventricular Assist Device Deactivation (S793)
  • DOI:
    10.1016/j.jpainsymman.2014.11.272
  • 发表时间:
    2015-02-01
  • 期刊:
  • 影响因子:
  • 作者:
    Keith Swetz;Sara Wordingham;Katlyn Cook;Abigale Ottenberg;Paul Mueller
  • 通讯作者:
    Paul Mueller
“But Turning it off ‘Feels Different’”: Responding to Clinical and Ethical Challenges With Implanted Cardiac Devices at End of Life (FR421)
  • DOI:
    10.1016/j.jpainsymman.2012.10.105
  • 发表时间:
    2013-02-01
  • 期刊:
  • 影响因子:
  • 作者:
    Keith Swetz;Tanya Stewart;Paul Mueller
  • 通讯作者:
    Paul Mueller
Palliative Care in Patients Treated with Left Ventricular Assist Device Destination Therapy (LVAD-DT) (330)
  • DOI:
    10.1016/j.jpainsymman.2009.11.273
  • 发表时间:
    2010-02-01
  • 期刊:
  • 影响因子:
  • 作者:
    Keith Swetz;Monica Freeman;Winifried Teuteberg;Paul Mueller
  • 通讯作者:
    Paul Mueller

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:
    --
  • 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:
    --
  • 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:
    --
  • 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:
    --
  • 项目类别:
    Standard Grant
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
  • 批准号:
    0609952
  • 财政年份:
    2007
  • 资助金额:
    --
  • 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:
    --
  • 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:
    --
  • 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:
    --
  • 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:
    --
  • 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:
    --
  • 项目类别:
    Standard Grant

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RAPID: Storm layer deposition, contaminant deliver and dispersal from Hurricane Ian (Sept. 2022) along SW Florida estuaries and fringing mangroves
快速:飓风伊恩(2022 年 9 月)沿佛罗里达州西南部河口和边缘红树林的风暴层沉积、污染物输送和扩散
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