Do metalliferous sediments record mid-ocean ridge hydrothermal activity? Constraining the roles of iron oxidation rate and 230Th scavenging
含金属沉积物是否记录了洋中脊热液活动?
基本信息
- 批准号:2030343
- 负责人:
- 金额:$ 44.28万
- 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:2020-09-01 至 2024-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Do metalliferous sediments record mid-ocean ridge hydrothermal activity?High-temperature vents at mid-ocean ridges are an important source of heat and dissolved metals to the ocean interior. As discharging hydrothermal vent fluids mix with bottom waters, chemical reactions create metal-rich particles. These particles are carried up from the vents by warm (buoyant) hydrothermal plumes that spread into the surrounding seawater. The plumes carry the particles away from the vents, and the particles fall to the seafloor along ridge axes and ridge flanks. As a result, mid-ocean ridges are blanketed with metal-rich sediments, which reflect the combined influence of hydrothermal activity, particle formation, plume transport, and sedimentary processes. Recent studies show that metal fluxes to ridge crest sediments vary on glacial-interglacial timescales. This suggests that climate-linked changes in global sea level may modulate seafloor hydrothermal activity. However, the metal flux records may be biased by other processes. Such biases would complicate efforts to understand the impact of climate on seafloor hydrothermal activity. The project would evaluate: 1) the influence of iron oxidation rate on metal fluxes to mid-ocean ridge sediments, and 2) whether scavenging of thorium (Th) from seawater by hydrothermal particles precludes the use of the radioisotope 230Th as a constant flux proxy in ridge settings. The proposed work could transform understanding of how climate and sea level influence hydrothermal output from mid-ocean ridges. The education-related broader impacts of the project include the training and mentoring of a Ph.D. student and an undergraduate researcher.Ridge-crest metal flux records from the Southern East Pacific Rise (SEPR), Mid-Atlantic Ridge, and Juan de Fuca Ridge indicate that hydrothermal sedimentation increased during the last deglaciation (~10-20 kyr BP). In addition, results from the SEPR also show that deglacial fluxes of 230Th to ridge crest sediments were 2-3x higher than the water column production rate. Although sea level-driven changes in hydrothermal activity are the simplest explanation of the results, variations in the oxidation rate of reduced iron may have modulated the metal flux signal. The proposed study will test the oxidation rate hypothesis using transects of metal flux records from the SEPR. If enhanced Fe(II) oxidation caused higher fluxes near the ridge axis, then corresponding deficits should be found at off-axis locations. Greater hydrothermal output, on the other hand, should yield greater fluxes on both the ridge crest and flanks. The study will also constrain oxidation rate changes using benthic foraminiferal B/Ca as a proxy for deep Pacific carbonate ion concentration. The B/Ca results will fill a key gap in existing records and improve our understanding of carbon cycling during the deglaciation. Finally, the study will use 3He-normalized 230Th fluxes to assess whether 230Th can be used to study sediment fluxes near mid-ocean ridges, a key region for paleoceanographic studies. The study will lay the necessary groundwork for evaluating how sea level influences hydrothermal output from mid-ocean ridges. The project will support the training of a Ph.D. student and an undergraduate researcher, including informal and formal guidance to develop teaching skills, professional networking, and grant proposal writing skills.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.
含金属沉积物是否记录了洋中脊热液活动?洋中脊的高温喷口是海洋内部热量和溶解金属的重要来源。当喷出的热液与海底水混合时,化学反应产生了富含金属的颗粒。这些颗粒被温暖的(浮力的)热液柱从喷口带上来,扩散到周围的海水中。烟羽带着颗粒离开喷口,颗粒沿着脊轴和脊翼落到海底。因此,洋中脊被富含金属的沉积物覆盖,这反映了热液活动、颗粒形成、羽流运输和沉积过程的综合影响。最近的研究表明,山脊沉积物的金属通量在冰期-间冰期时间尺度上是不同的。这表明,与气候有关的全球海平面变化可能会调节海底热液活动。然而,金属通量记录可能会受到其他过程的影响。这种偏见会使了解气候对海底热液活动影响的努力复杂化。该项目将评估:1)铁氧化速率对大洋中脊沉积物金属通量的影响,以及2)热液颗粒从海水中清除钍(Th)是否排除了在海脊环境中使用放射性同位素230Th作为恒定通量代理。这项提议的工作可能会改变人们对气候和海平面如何影响洋中脊热液输出的理解。该项目与教育相关的更广泛影响包括培训和指导一名博士生和一名本科生研究员。东南东太平洋隆起、大西洋中脊和Juan de Fuca脊的脊脊-脊脊金属通量记录表明,末次消冰期(~10-20 kyr BP)热液沉积增加。此外,SEPR的结果还表明,2330s对脊顶沉积物的消冰通量比水柱生成速率高2-3倍。虽然海平面驱动的热液活动变化是对结果的最简单解释,但还原铁氧化速率的变化可能调节了金属通量信号。拟议的研究将使用SEPR的金属通量记录的横断面来测试氧化速率假设。如果增强的Fe(II)氧化引起了山脊轴附近较高的通量,那么在离轴位置应该发现相应的缺陷。另一方面,更大的热液输出应该在脊顶和侧翼产生更大的通量。该研究还将限制氧化速率的变化,使用底栖有孔虫B/Ca作为深太平洋碳酸盐离子浓度的代理。B/Ca结果将填补现有记录的一个关键空白,并提高我们对冰川消融期间碳循环的理解。最后,本研究将利用3he归一化的230Th通量来评估230Th是否可以用于研究古海洋学研究的关键区域洋中脊附近的沉积物通量。这项研究将为评估海平面如何影响洋中脊的热液输出奠定必要的基础。该项目将支持一名博士生和一名本科生研究员的培训,包括非正式和正式指导,以发展教学技能、专业网络和拨款申请写作技能。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识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)
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David Lund其他文献
20 years of bibliometric data illustrates a lack of concordance between journal impact factor and fungal species discovery in systematic mycology
20 年的文献计量学数据表明,在系统真菌学中,期刊影响因子与真菌物种发现之间缺乏一致性
- DOI:
10.3897/mycokeys.110.136048 - 发表时间:
2024-01-01 - 期刊:
- 影响因子:3.600
- 作者:
R. Henrik Nilsson;Arnold Tobias Jansson;Christian Wurzbacher;Sten Anslan;Pauline Belford;Natàlia Corcoll;Alexandra Dombrowski;Masoomeh Ghobad-Nejhad;Mikael Gustavsson;Daniela Gómez-Martínez;Faheema Kalsoom Khan;Maryia Khomich;Charlotte Lennartsdotter;David Lund;Breyten Van Der Merwe;Vladimir Mikryukov;Marko Peterson;Teresita M. Porter;Sergei Põlme;Alice Retter;Erik Kristiansson - 通讯作者:
Erik Kristiansson
A dynamic model of patient consent to sharing of medical record data
患者同意共享医疗记录数据的动态模型
- DOI:
- 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
W. Dixon;Karen Spencer;H. Williams;C. Sanders;David Lund;E. Whitley;J. Kaye - 通讯作者:
J. Kaye
Genetic compatibility and ecological connectivity drive the dissemination of antibiotic resistance genes
遗传相容性和生态连通性推动了抗生素抗性基因的传播
- DOI:
10.1038/s41467-025-57825-3 - 发表时间:
2025-03-16 - 期刊:
- 影响因子:15.700
- 作者:
David Lund;Marcos Parras-Moltó;Juan S. Inda-Díaz;Stefan Ebmeyer;D. G. Joakim Larsson;Anna Johnning;Erik Kristiansson - 通讯作者:
Erik Kristiansson
Performance Evaluation of Wireless Mesh Network Routing Protocols for Smart Grid AMI Networks
智能电网 AMI 网络无线网状网络路由协议的性能评估
- DOI:
- 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
Yakubu Tsado;K. Gamage;David Lund - 通讯作者:
David Lund
Consent, Risk and Compliance: Technologies and Processes
同意、风险和合规性:技术和流程
- DOI:
10.1109/waina.2016.176 - 发表时间:
2016 - 期刊:
- 影响因子:0
- 作者:
David Lund;G. Mourikas;Bassem Ammar;Abubakr Magzoub;N. Catterall - 通讯作者:
N. Catterall
David Lund的其他文献
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{{ truncateString('David Lund', 18)}}的其他基金
Collaborative Research: Resolving the LGM ventilation age conundrum: New radiocarbon records from high sedimentation rate sites in the deep western Pacific
合作研究:解决LGM通风年龄难题:西太平洋深部高沉降率地点的新放射性碳记录
- 批准号:
2341425 - 财政年份:2024
- 资助金额:
$ 44.28万 - 项目类别:
Continuing Grant
Was the deep Atlantic dominated by southern source waters during the LGM? A conservative view based on the oxygen isotopic ratio of benthic foraminifera
末次盛冰期期间,大西洋深海是否以南部源水为主?
- 批准号:
2306931 - 财政年份:2023
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Tracking Southern Ocean sea ice extent and frontal positions: Novel techniques based on oxygen isotope and Mg/Ca analyses of foraminifera
跟踪南大洋海冰范围和锋面位置:基于氧同位素和有孔虫 Mg/Ca 分析的新技术
- 批准号:
2002425 - 财政年份:2020
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
EAGER: Anomalous submarine volcanism during glacial terminations: Exploring archives from the global mid-ocean ridge system
渴望:冰川终止期间的异常海底火山活动:探索全球大洋中脊系统的档案
- 批准号:
1840886 - 财政年份:2018
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
The Atlantic's role in ice age inception and termination: Assessing carbon storage and release with new Brazil Margin profiles from MIS 2 to MIS 6
大西洋在冰河时代开始和终止中的作用:利用新的巴西边际概况(从 MIS 2 到 MIS 6)评估碳储存和释放
- 批准号:
1804030 - 财政年份:2018
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Millennial-scale atmospheric CO2 variability during the last deglaciation: Testing the biological pump hypothesis using upper ocean carbon isotope records
末次冰消期间的千年尺度大气二氧化碳变化:利用上层海洋碳同位素记录检验生物泵假说
- 批准号:
1702231 - 财政年份:2017
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Collaborative Research: Sea level induced hydrothermal activity as a trigger for glacial terminations
合作研究:海平面引起的热液活动作为冰川终止的触发因素
- 批准号:
1558641 - 财政年份:2016
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Diagnosing the origin of isotopically light carbon in the South Atlantic during the last deglaciation: An oceanic or geologic source?
诊断上次冰消期期间南大西洋同位素轻碳的起源:海洋还是地质来源?
- 批准号:
1404915 - 财政年份:2014
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Collaborative Research: P2C2--Western Equatorial Pacific Rainfall during the Holocene - New Interannual Records from High Resolution Borneo Stalagmites
合作研究:P2C2——全新世西赤道太平洋降雨——高分辨率婆罗洲石笋的新年际记录
- 批准号:
1354034 - 财政年份:2013
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
Collaborative Research: P2C2--Western Equatorial Pacific Rainfall during the Holocene - New Interannual Records from High Resolution Borneo Stalagmites
合作研究:P2C2——全新世西赤道太平洋降雨——高分辨率婆罗洲石笋的新年际记录
- 批准号:
1103385 - 财政年份:2011
- 资助金额:
$ 44.28万 - 项目类别:
Standard Grant
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