The Paleoarchean: A Pivotal Time in Earth Crustal Evolution--the View from the Zimbabwe and Sao Francisco Cratons.
古太古代:地壳演化的关键时期——从津巴布韦和圣弗朗西斯科克拉通看。
基本信息
- 批准号:2222254
- 负责人:
- 金额:$ 27.32万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-07-01 至 2025-06-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The creation and growth of Earth’s continents is a topic that has captivated geoscientists—and engendered spirited debate—for decades. Questions about the formation and evolution of stable continents during Earth’s earliest history have been vigorously debated in the literature for over 50 years and continue to be a focus of current research. Archean rocks (those older than 2.5 billion years) represent nearly half of Earth’s history, but only occur in a few areas on the continents. Rocks from the Paleoarchean (3.6 to 3.2 billion years) and Eoarchean (4.0 to 3.6 billion years) are considerably more rare and represent only a small percentage of all preserved Archean rocks worldwide. These Paleoarchean and older rocks represent windows into the early Earth and the formation, nature, and evolution of the ancient continents. This proposal seeks to study the record of crustal formation, modification, and stabilization of the Zimbabwe and São Francisco (Brazil) cratons, two of the best preserved and exposed fragments of Paleoarchean continental crust on Earth. The study of the early Earth, as well as questions regarding the time and processes involved in the initiation of modern plate tectonics, have been included as a priority in several community-based documents, including the “Challenges & Opportunities for Research in Tectonics” (Huntington & Klepeis, 2018) and, “A vision for NSF Earth Sciences 2020-2030: Earth in time” report of the NSF (National Academies of Sciences, Engineering, and Medicine 2020). The integrated approach taken in this proposal will enhance the geographic coverage of studies on Archean cratons and improve the record from the earliest history of the Earth and will contribute to the understanding of the whole picture of the early Earth. This proposal will also contribute to the building of a more diverse geoscience community by supporting women in science with one PhD Latinx student. Collaboration with Brazilian and South African colleagues is an integral part of this research project. This research proposal seeks to integrate isotope geochemistry and geochronology to study the 3.65-2.70 Ga Zimbabwe and São Francisco (SF) cratons, two important Archean terranes that have received relatively little attention despite their extensive Archean geological record. The Zimbabwe and SF cratons are two of the best preserved and exposed portions of unmodified Paleoarchean continental crust on Earth. These cratons also preserved dome and keel structures, archetypal of Archean crust. The aim of this research is to constrain the evolution of the central portion of the Zimbabwe craton and the Gavião block and gneiss complexes from the northern and southern SF craton. The approach in this research is to: 1) determine the timescale of crust formation through the Paleoarchean in these areas; 2) determine the Hf and Nd isotope record of these cratons and how they have evolved through time; and 3) evaluate the Lu-Hf and Sm-Nd isotope systematics of the gneiss complexes to determine if they have faithfully recorded and preserved their initial isotope compositions. This work will be done using an integrated approach of in-situ U-Pb age and Lu-Hf/Sm-Nd isotope analysis of zircon, titanite, and other REE-rich accessory phases, combined with solution Lu-Hf and Sm-Nd isotope dilution analyses of bulk rock samples. Where possible, garnet Lu-Hf and Sm-Nd geochronology—in conjunction with age and isotope data from accessory phases—will be used to document post-magmatic tectono-thermal events. This integrated geochemical and geochronological approach will provide a timeframe of crust formation events and a robust Hf and Nd isotope record of the Zimbabwe and SF cratons. This, ultimately, will help the community to evaluate processes of crust formation, modification, and stabilization in the Paleoarchean—a pivotal time in Earth’s crustal evolution. This proposed research represents a continuation of the work that has been done by the PI, students, and post-docs in Greenland, in the Acasta Gneiss Complex, and what has been done (and is still ongoing) in the Pilbara Craton of NW Australia.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.
几十年来,地球大陆的形成和生长是一个让地球科学家着迷的话题,并引发了激烈的争论。50 多年来,有关地球最早历史期间稳定大陆的形成和演化的问题一直在文献中激烈争论,并且仍在继续。太古宙岩石(年龄超过 25 亿年)代表了近一半的地球历史,但仅出现在大陆的少数地区。古太古代(3.6 至 32 亿年)和太太古代(4.0 至 36 亿年)相当罕见,仅占全世界所有保存下来的太古代岩石的一小部分。这些古太古代和更古老的岩石是了解早期地球及其形成、自然的窗口。以及古代大陆的演化,该提案旨在研究津巴布韦和圣弗朗西斯科(巴西)克拉通这两个克拉通的地壳形成、改造和稳定的记录。地球上保存最完好和暴露的古太古代大陆地壳碎片对早期地球的研究,以及有关现代板块构造开始的时间和过程的问题,已作为优先事项纳入了一些社区文件中,包括“构造学研究的挑战和机遇”(Huntington & Klepeis,2018)和“2020-2030 年 NSF 地球科学愿景:地球在NSF(美国国家科学、工程和医学院,2020 年)的报告中采用的综合方法将扩大太古代克拉通研究的地理覆盖范围,改善地球最早历史记录,并将做出贡献。该提案还将通过与一名拉丁裔博士生的合作来支持科学界的女性,从而有助于建立一个更加多元化的地球科学界。研究该研究计划旨在整合同位素地球化学和地质年代学来研究 3.65-2.70 Ga 津巴布韦和圣弗朗西斯科 (SF) 克拉通,这两个重要的太古代地体尽管拥有广泛的太古代地质记录,但受到的关注相对较少。是地球上未经改造的古太古代大陆地壳中保存最完好和暴露的两个部分,这些克拉通还保存了穹顶和龙骨结构,这项研究的目的是限制津巴布韦克拉通中部和北部和南部 SF 克拉通的加维昂地块和片麻岩杂岩的演化。这些地区古太古代地壳形成的时间尺度;2) 确定这些克拉通的 Hf 和 Nd 同位素记录以及它们如何随时间演化;3) 评估对片麻岩杂岩进行 Lu-Hf 和 Sm-Nd 同位素系统分析,以确定它们是否忠实地记录和保存了其初始同位素组成。这项工作将使用原位 U-Pb 年龄和 Lu-Hf/Sm 的综合方法来完成。 - 锆石、钛矿和其他富含 REE 副相的 Nd 同位素分析,结合溶液 Lu-Hf 和 Sm-Nd 同位素稀释分析在可能的情况下,石榴石 Lu-Hf 和 Sm-Nd 地质年代学 - 结合来自附属阶段的年龄和同位素数据 - 将用于记录岩浆后构造热事件,这种综合地球化学和地质年代学方法将提供一个时间范围。地壳形成事件以及津巴布韦和 SF 克拉通的可靠 Hf 和 Nd 同位素记录,这最终将有助于社区评估地壳形成、改变和稳定的过程。古太古代——地球地壳演化的关键时期。这项拟议的研究是格陵兰岛阿卡斯塔片麻岩杂岩区的 PI、学生和博士后工作的延续。仍在进行中)在澳大利亚西北部的皮尔巴拉克拉通。该奖项反映了 NSF 的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。
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)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Jeffrey Vervoort其他文献
Assembly of lower continental crust: A garnet Lu-Hf petrochronological investigation of the Ivrea-Verbano Zone, Italy
下大陆地壳组合:意大利伊夫雷亚-韦尔巴诺带石榴石 Lu-Hf 岩石年代学调查
- DOI:
- 发表时间:
2024 - 期刊:
- 影响因子:5.3
- 作者:
Charlotte H. Connop;A. Smye;J. Garber;Amy C. Moser;M. Caddick;Jeffrey Vervoort - 通讯作者:
Jeffrey Vervoort
Jeffrey Vervoort的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Jeffrey Vervoort', 18)}}的其他基金
Collaborative Research: Creating Earth’s earliest continents—an integrated investigation of the growth and modification of western Australia’s Pilbara Craton
合作研究:创造地球最早的大陆——对澳大利亚西部皮尔巴拉克拉通的生长和改造进行综合调查
- 批准号:
2020831 - 财政年份:2020
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Collaborative Research: Growth, preservation, and modification of Neoarchean to Paleoproterozoic crust, an example from the Wyoming province, Montana
合作研究:新太古代到古元古代地壳的生长、保存和改造,以蒙大拿州怀俄明州为例
- 批准号:
1854390 - 财政年份:2019
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
MRI: Acquisition of a laser-ablation, multi-collector ICP-MS for research and training in Earth, Environmental, and Anthropological Sciences
MRI:购买激光烧蚀、多接收器 ICP-MS,用于地球、环境和人类学研究和培训
- 批准号:
1626670 - 财政年份:2016
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Collaborative Research: The Building of a Continent: The Archean to Proterozoic Growth and Modification of Western Laurentia
合作研究:大陆的形成:太古代到元古代的生长和西劳伦大陆的改造
- 批准号:
1427473 - 财政年份:2014
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Collaborative Research: Early Earth Evolution: Hf and Nd Isotopic Constraints from the ca 3.4->4.0 Ga Acasta Gneisses
合作研究:早期地球演化:来自 ca 3.4- 的 Hf 和 Nd 同位素约束
- 批准号:
1321998 - 财政年份:2013
- 资助金额:
$ 27.32万 - 项目类别:
Continuing Grant
Collaborative Research: Dating Subduction Zone Metamorphism: Testing the Effect of Pressure-temperature Path on Lawsonite Lu-Hf Geochronology
合作研究:俯冲带变质作用测年:测试压力-温度路径对硬钠石 Lu-Hf 地质年代学的影响
- 批准号:
1119237 - 财政年份:2011
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Collaborative Research: Constraining the Formation and Evolution of the Proterozoic Orogenic Belt of the SW USA Based on Geochronology of Garnet and Accessory Minerals
合作研究:基于石榴石及副矿物年代学约束美国西南部元古界造山带的形成和演化
- 批准号:
1019877 - 财政年份:2010
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Collaborative Research: Deformation and Magmatic Modification of a Steep Continental Margin, Western Idaho-eastern Oregon
合作研究:爱达荷州西部-俄勒冈州东部陡峭大陆边缘的变形和岩浆改造
- 批准号:
0844149 - 财政年份:2009
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
Technician Support (Years 4 and 5) for Radiogenic Isotope and Geochronology Facility, Washington State University.
华盛顿州立大学放射性同位素和地质年代学设施的技术人员支持(第 4 年和第 5 年)。
- 批准号:
0744393 - 财政年份:2008
- 资助金额:
$ 27.32万 - 项目类别:
Continuing Grant
Collaborative Research: Constraining the Timing and Nature of Proterozoic Metamorphism in the Northwest U.S. Cordillera
合作研究:限制美国西北部科迪勒拉元古代变质作用的时间和性质
- 批准号:
0711326 - 财政年份:2007
- 资助金额:
$ 27.32万 - 项目类别:
Standard Grant
相似国自然基金
基于近似广义枢轴量的快速高精度性能退化分析方法研究
- 批准号:72071138
- 批准年份:2020
- 资助金额:48 万元
- 项目类别:面上项目
基于枢轴语言的汉越句法统计翻译方法研究
- 批准号:61672271
- 批准年份:2016
- 资助金额:61.0 万元
- 项目类别:面上项目
基于互联网的汉语-缅语双语平行语料抽取方法及语料库构建
- 批准号:61662041
- 批准年份:2016
- 资助金额:40.0 万元
- 项目类别:地区科学基金项目
基于枢轴语言和图映射的历史典籍术语对齐研究
- 批准号:61402068
- 批准年份:2014
- 资助金额:23.0 万元
- 项目类别:青年科学基金项目
基于主题模型的枢轴语言统计机器翻译研究
- 批准号:61303082
- 批准年份:2013
- 资助金额:27.0 万元
- 项目类别:青年科学基金项目
相似海外基金
Optimization and testing of anti-methamphetamine antibody therapy to support pivotal clinical trials and commercialization
抗甲基苯丙胺抗体疗法的优化和测试以支持关键的临床试验和商业化
- 批准号:
10152573 - 财政年份:2020
- 资助金额:
$ 27.32万 - 项目类别:
Optimization and testing of anti-methamphetamine antibody therapy to support pivotal clinical trials and commercialization
抗甲基苯丙胺抗体疗法的优化和测试以支持关键的临床试验和商业化
- 批准号:
10361540 - 财政年份:2020
- 资助金额:
$ 27.32万 - 项目类别:
An Administrative Supplement to Increase the Recruitment Rates of R01 DA047301 a Pivotal Trial of a Novel Digital Therapeutic for Smoking Cessation in Psychiatric Populations
提高 R01 DA047301 招募率的行政补充 精神病人群戒烟新型数字疗法的关键试验
- 批准号:
10818811 - 财政年份:2020
- 资助金额:
$ 27.32万 - 项目类别:
Pivotal role of thalamic hypocretin transmission during EtOH seeking and relapse
丘脑下丘脑分泌素传输在乙醇寻找和复发过程中的关键作用
- 批准号:
10436851 - 财政年份:2018
- 资助金额:
$ 27.32万 - 项目类别:
Pivotal role of thalamic hypocretin transmission during EtOH seeking and relapse
丘脑下丘脑分泌素传输在乙醇寻找和复发过程中的关键作用
- 批准号:
10200612 - 财政年份:2018
- 资助金额:
$ 27.32万 - 项目类别: