Collaborative Research: EAGER: Development of a Method for Paired Potassium/Argon Geochronology and Strontium-Neodymium-Lead Radiogenic Isotope Geochemistry of Dust in Ice Cores
合作研究:EAGER:开发冰芯尘埃配对钾/氩地质年代学和锶-钕-铅放射性同位素地球化学方法
基本信息
- 批准号:2032849
- 负责人:
- 金额:$ 8.27万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2020
- 资助国家:美国
- 起止时间:2020-08-15 至 2024-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Atmospheric dust and sediment serve as valuable tracers of past Earth and ocean processes because their geochemical compositions reflect their bedrock parent material. Scientists use the compositions of sediments and dust as a ‘fingerprint’, linking materials at downstream sites, such as ice and sediment cores, back to their sources. Through geochemical fingerprinting, scientists have gained insight into the causes and impacts of abrupt climate changes, the stability of ice sheets and their potential contributions to sea level rise, and the mechanisms by which ocean and atmospheric circulation patterns change. This project aims to harness the capabilities of two different techniques used to determine sediment provenance. The approach will allow the team to address critical questions regarding past wind patterns around Antarctica, the roles of different dust sources in supplying nutrients to the Southern Ocean, and the behavior of the West Antarctic Ice Sheet during the last interglacial warm period. In addition, the method has the potential to be applied to extraterrestrial materials such as from the Mars Mission and Moon rocks. Geochemical tracing of dust and other sediment sources is a powerful approach that aids in reconstructing past atmosphere, ocean, and ice-sheet dynamics. However, in some regions such as the Southern Hemisphere, even multi-variate approaches such as those using strontium, neodymium, and lead isotopes yield ambiguous results due to overlapping source-area compositions. The team has found that lead isotopes add great value in distinguishing sources and that combining these with potassium/argon geochronology provides significant additional constraints on sediment provenance. The added value is due to the relative ease of resetting potassium/argon ages during subsequent geologic events such as crystallization of new minerals during diagenesis, or by heating, with resetting occurring at lower temperatures than other isotopic systems. The team will develop and test the proposed approach using rock and mineral standards and fine-grained sediments, then apply it to ice-core dust samples from deaccessioned ice cores and dust from the Last Glacial Maximum at key sites. Beyond the broader scientific impact of this new approach, the project will provide opportunities for Colby College undergraduates to experience complete immersion in the world of discovery, working both in Dr. Bess Koffman’s geochemistry lab at Colby and at the Lamont-Doherty Earth Observatory of Columbia University, where they will engage with a wider cohort of students from around the country and have access to state-of-the-art analytical facilities.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.
大气尘埃和沉积物是过去地球和海洋过程的宝贵示踪物,因为它们的地球化学成分反映了它们的基岩母质。科学家利用沉积物和尘埃的成分作为“指纹”,将冰芯和沉积物核心等下游地点的物质联系起来,追溯到它们的源头。通过地球化学指纹,科学家们深入了解了气候突然变化的原因和影响,冰盖的稳定性及其对海平面上升的潜在贡献,以及海洋和大气环流模式变化的机制。该项目旨在利用用于确定沉积物来源的两种不同技术的能力。该方法将使该团队能够解决有关南极洲周围过去的风型、不同尘源在向南大洋提供营养物质方面的作用以及西南极冰盖在最后一次间冰期暖期期间的行为等关键问题。此外,该方法有可能应用于外星物质,如火星任务和月球岩石。尘埃和其他沉积物来源的地球化学示踪是帮助重建过去的大气、海洋和冰盖动力学的有效方法。然而,在一些区域,如南半球,即使是使用锶、钕和铅同位素的多变量方法,也会由于源区成分重叠而产生不明确的结果。研究小组发现,铅同位素在区分来源方面有很大的价值,与钾/氩年代学相结合,对沉积物的来源提供了显著的额外限制。这一附加值是由于在随后的地质事件中重置K/Ar年龄相对容易,例如在成岩作用期间新矿物的结晶,或通过加热重置,重置发生在比其他同位素系统更低的温度。该团队将使用岩石和矿物标准以及细粒沉积物来开发和测试拟议的方法,然后将其应用于来自去冰芯的冰芯尘埃样本和关键地点最后一次冰盛期的尘埃。除了这种新方法的更广泛的科学影响,该项目还将为科尔比学院的本科生提供机会,完全沉浸在发现的世界中,他们在科尔比的贝丝·科夫曼博士的地球化学实验室和哥伦比亚大学的拉蒙特-多尔蒂地球天文台工作,在那里他们将与来自全国各地的更广泛的学生进行接触,并获得最先进的分析设施。该奖项反映了NSF的法定使命,并通过使用基金会的智力优势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)
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Sidney Hemming其他文献
The Maud Belt (East Antarctica) as an accretionary orogen in Rodinia: Isotopic composition, evolution and spatial variation
- DOI:
10.1016/j.gr.2025.05.026 - 发表时间:
2025-10-01 - 期刊:
- 影响因子:8.600
- 作者:
Cheng-Cheng Wang;Joachim Jacobs;Horst R. Marschall;Sidney Hemming;Guillaume Jacques;Andreas Läufer - 通讯作者:
Andreas Läufer
West Antarctic ice retreat and paleoceanography in the Amundsen Sea in the warm early Pliocene
早更新世温暖时期阿蒙森海的西南极冰消退与古海洋学
- DOI:
10.1038/s41467-025-60772-8 - 发表时间:
2025-07-01 - 期刊:
- 影响因子:15.700
- 作者:
Sandra Passchier;Claus-Dieter Hillenbrand;Sidney Hemming;Werner Ehrmann;Thomas Frederichs;Steve M. Bohaty;Ronald Leon;Olga Libman-Roshal;Lisbeth Mino-Moreira;Karsten Gohl;Julia Wellner - 通讯作者:
Julia Wellner
Sidney Hemming的其他文献
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{{ truncateString('Sidney Hemming', 18)}}的其他基金
Collaborative Research: US GEOTRACES GP17-OCE: Understanding neodymium isotopes and rare earth element systematics in the South Pacific
合作研究:US GEOTRACES GP17-OCE:了解南太平洋的钕同位素和稀土元素系统学
- 批准号:
2049604 - 财政年份:2021
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Collaborative Research: Linking Marine and Terrestrial Sedimentary Evidence for Plio-pleistocene Variability of Weddell Embayment and Antarctic Peninsula Glaciation
合作研究:将海洋和陆地沉积证据联系起来,了解威德尔海湾和南极半岛冰川的上里奥-更新世变化
- 批准号:
2114763 - 财政年份:2021
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Collaborative Research: Examining linkages between the Agulhas Leakage and ocean overturning in the last glacial cycle and through the mid-Pleistocene transition
合作研究:研究末次冰河周期和中更新世过渡期间阿加勒斯泄漏与海洋翻转之间的联系
- 批准号:
1831415 - 财政年份:2018
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Acquisition of a State-of-the-Art 40Ar/39Ar Geochronology System for the AGES Lab at Lamont-Doherty Earth Observatory
为拉蒙特-多尔蒂地球观测站 AGES 实验室采购最先进的 40Ar/39Ar 地质年代学系统
- 批准号:
1636685 - 财政年份:2016
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Collaborative Research: East Antarctic Glacial Landscape Evolution (EAGLE): A Study using Combined Thermochronology, Geochronology and Provenance Analysis
合作研究:东南极冰川景观演化(EAGLE):综合热年代学、地质年代学和起源分析的研究
- 批准号:
1443565 - 财政年份:2016
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
EAGER: Proof of concept: U-Th Dating of Lake-level History at Mono Basin, CA
EAGER:概念证明:加州莫诺盆地湖面历史 U-Th 测年
- 批准号:
1353272 - 财政年份:2013
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: EAGER: Evaluating the Larsen basin's suitability for testing the Cretaceous Glaciation Hypothesis
合作研究:EAGER:评估拉森盆地测试白垩纪冰川假说的适用性
- 批准号:
1241574 - 财政年份:2012
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Collaborative Research: Development of 40Ar/39Ar Intercalibration Pipettes
合作研究:开发40Ar/39Ar相互校准移液器
- 批准号:
1057610 - 财政年份:2011
- 资助金额:
$ 8.27万 - 项目类别:
Continuing Grant
Collaborative Research: East Antarctic outlet glacier contributions to the Ross Sea from chronology of detrital grains
合作研究:从碎屑颗粒年代学来看东南极出口冰川对罗斯海的贡献
- 批准号:
1043619 - 财政年份:2010
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
Collaborative Research: Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology
合作研究:多方法碎屑地质年代学和热年代学研究东南极洲的侵蚀历史和沉积物来源
- 批准号:
0838729 - 财政年份:2009
- 资助金额:
$ 8.27万 - 项目类别:
Standard Grant
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