Tungsten and Ruthenium Isotopic Study of the Chemical Evolution of Earth
地球化学演化的钨和钌同位素研究
基本信息
- 批准号:1624587
- 负责人:
- 金额:$ 46万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-07-15 至 2020-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The Earth was likely built as a result of a series of a series of collisions of increasingly larger planetesimals, during the first 50 million years of Solar System history. Growth of the planet largely terminated after a final, giant impact that led to melting of much of the Earth and the creation of the Moon. Surprisingly, there is strong evidence present in the isotopic compositions of some elements in both ancient and young rocks that domains were created within the Earth?s mantle during the primary construction period of the Earth before the giant impact, and these domains have been somehow preserved to the present. This study will examine the tungsten and ruthenium isotopic compositions of rocks derived from these domains to provide new insights to processes occurring within the Earth as it grew, as well as help to constrain the genetic origins of the building blocks of our planet. Small variations in the abundance of 182-tungsten in terrestrial rocks likely reflects the decay of 182-hafnium, coupled with very early chemical fractionations of the two elements within the silicate portion of the Earth. Prior studies have suggested that modest variations in 182-tungsten among some primitive rocks may reflect processes occurring in early-formed magma oceans. This study will seek to more fully establish the causes of the isotopic heterogeneities, and assess why convective stirring of the mantle has not mixed away the heterogeneities in more than 4.5 billion years. The isotopic composition of Ru varies among planetary bodies in our Solar System as a result of the incorporation of diverse mixtures of nucleosynthetic components. Hence, if the Earth was built from genetically diverse materials, early-formed mantle domains identified by tungsten isotopic variations, may contain ruthenium that is isotopically distinguishable from the dominant composition of the mantle today. If so, the particular building block identified may be tied to a specific type of cosmochemical precursor.
地球可能是在太阳系历史的前5000万年里,由于一系列越来越大的小行星的碰撞而形成的。在最终的巨大撞击导致地球大部分地区融化并创造月球后,地球的生长基本上停止了。令人惊讶的是,在古老和年轻岩石中的某些元素的同位素组成中,有强有力的证据表明域是在地球内部产生的。在大撞击前的地球主要构造时期,这些区域一直以某种方式保存到现在。这项研究将检查来自这些领域的岩石的钨和钌同位素组成,为地球生长过程中发生的过程提供新的见解,并有助于限制我们星球的构建块的遗传起源。地球岩石中182-钨丰度的微小变化可能反映了182-铪的衰变,再加上地球硅酸盐部分中这两种元素的早期化学分馏。先前的研究表明,一些原始岩石中182-钨的适度变化可能反映了早期形成的岩浆海洋中发生的过程。这项研究将寻求更全面地确定同位素不均匀性的原因,并评估为什么地幔的对流搅拌在超过45亿年的时间里没有混合掉不均匀性。由于核合成成分的不同混合物,太阳系中不同行星体的钌同位素组成有所不同。因此,如果地球是由遗传多样性的材料建造的,那么通过钨同位素变化识别的早期形成的地幔域可能含有钌,这与今天地幔的主要成分是同位素区别的。如果是这样的话,所确定的特定构件可能与特定类型的宇宙化学前体有关。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
182W and 187Os constraints on the origin of siderophile isotopic heterogeneity in the mantle
- DOI:10.1016/j.gca.2023.11.003
- 发表时间:2023-11-15
- 期刊:
- 影响因子:5
- 作者:Walker,Richard J.;Mundl-Petermeier,Andrea;Chauvel,Catherine
- 通讯作者:Chauvel,Catherine
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Richard Walker其他文献
The Chaman and Paghman active faults, west of Kabul, Afghanistan: active tectonics, geomorphology, and evidence for rupture in the destructive 1505 earthquake
阿富汗喀布尔以西的查曼和帕格曼活动断层:活动构造、地貌以及 1505 年破坏性地震中断裂的证据
- DOI:
10.1016/j.jseaes.2023.105925 - 发表时间:
2023 - 期刊:
- 影响因子:3
- 作者:
Zakeria Shnizai;Richard Walker;Hiroyuki Tsutsumi - 通讯作者:
Hiroyuki Tsutsumi
Blended Problem-Based Learning: Designing Collaboration Opportunities for Unguided Group Research Through the Use of Web 2.0 Tools
基于问题的混合学习:通过使用 Web 2.0 工具为无指导的小组研究设计协作机会
- DOI:
- 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
Richard Walker - 通讯作者:
Richard Walker
Genetic Redundancy in Evolving Populations of Simulated Robots
模拟机器人群体进化中的遗传冗余
- DOI:
- 发表时间:
2002 - 期刊:
- 影响因子:2.6
- 作者:
O. Miglino;Richard Walker - 通讯作者:
Richard Walker
Concordance between transrectal ultrasound guided biopsy results and radical prostatectomy final pathology: Are we getting better at predicting final pathology?
经直肠超声引导活检结果与根治性前列腺切除术最终病理学之间的一致性:我们在预测最终病理学方面是否做得更好?
- DOI:
- 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
Richard Walker;U. Lindner;Alyssa S. Louis;Robin Kalnin;M. Ennis;Michael E. Nesbitt;T. H. van der Kwast;A. Finelli;N. Fleshner;A. Zlotta;M. Jewett;R. Hamilton;G. Kulkarni;J. Trachtenberg - 通讯作者:
J. Trachtenberg
Osuntokun Award Lecture 2021: Challenges of Measuring the Burden of Stroke in Africa.
2021 年 Osuntokun 奖讲座:衡量非洲中风负担的挑战。
- DOI:
- 发表时间:
2022 - 期刊:
- 影响因子:2.5
- 作者:
Richard Walker - 通讯作者:
Richard Walker
Richard Walker的其他文献
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{{ truncateString('Richard Walker', 18)}}的其他基金
Spatiotemporal Variability of Tungsten-182 in the Hawaiian Plume
夏威夷羽流中钨 182 的时空变化
- 批准号:
2121979 - 财政年份:2021
- 资助金额:
$ 46万 - 项目类别:
Continuing Grant
Developing a novel approach for generating 3D deformation fields in order to probe the mechanics of earthquake ruptures
开发一种生成 3D 变形场的新方法,以探究地震破裂的机制
- 批准号:
NE/T01427X/1 - 财政年份:2020
- 资助金额:
$ 46万 - 项目类别:
Research Grant
Study of Mass Independent Isotopic Compositions of Ru and Mo in Early Earth Rocks
早期地球岩石中钌和钼的质量独立同位素组成研究
- 批准号:
2020029 - 财政年份:2020
- 资助金额:
$ 46万 - 项目类别:
Standard Grant
Acquisition of a State-of-the-Art Multi-Collector Inductively-Coupled Plasma Mass Spectrometer
购置最先进的多收集器电感耦合等离子体质谱仪
- 批准号:
1659023 - 财政年份:2017
- 资助金额:
$ 46万 - 项目类别:
Continuing Grant
Application of Siderophile Elements to the Study of the Chemical Structure and Mixing History of the Oceanic Mantle
亲铁元素在大洋地幔化学结构和混合历史研究中的应用
- 批准号:
1423879 - 财政年份:2014
- 资助金额:
$ 46万 - 项目类别:
Continuing Grant
Acquisition of a State-of-the-Art Thermal Ionization Mass Spectrometer
购置最先进的热电离质谱仪
- 批准号:
1255787 - 财政年份:2013
- 资助金额:
$ 46万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Application of Siderophile Elements to Early Earth Processes and Mantle Mixing
CSEDI合作研究:亲铁元素在早期地球过程和地幔混合中的应用
- 批准号:
1265169 - 财政年份:2013
- 资助金额:
$ 46万 - 项目类别:
Continuing Grant
CSEDI Collaborative Research: Application of siderophile elements to mantle geodynamics
CSEDI合作研究:亲铁元素在地幔地球动力学中的应用
- 批准号:
1160728 - 财政年份:2012
- 资助金额:
$ 46万 - 项目类别:
Standard Grant
The timing and cause of mountain building in central Asia
中亚造山的时间和原因
- 批准号:
NE/J014141/1 - 财政年份:2012
- 资助金额:
$ 46万 - 项目类别:
Research Grant
Doctoral Dissertation Research: Contested Renewal: The Rebuilding of the South Bronx
博士论文研究:有争议的更新:南布朗克斯的重建
- 批准号:
1003827 - 财政年份:2010
- 资助金额:
$ 46万 - 项目类别:
Standard Grant
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