Collaborative Research: Investigating intraplate melting processes in northwest New Zealand with seismic imaging
合作研究:利用地震成像研究新西兰西北部的板内熔融过程
基本信息
- 批准号:2241063
- 负责人:
- 金额:$ 38.93万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-07-01 至 2027-06-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
While most of Earth’s volcanoes occur at the boundaries between tectonic plates, many others occur within plate interiors. Some of these intraplate volcanoes, such as those in Hawaii, are linked to hot mantle that flows upward from depths of more than 2500 km in the lower mantle. Others, however, have more enigmatic origins. One group of volcanoes in the enigmatic category erupt lavas whose chemistry is consistent with melting of rocks at depths of 410 km to 660 km. The New Zealand Auckland Volcanic Field is an example of this type of volcanic zone. The goal of this project is to image the melting region for these volcanos. This will be carried out by measuring the properties of the mantle beneath the North Island of New Zealand and the surrounding ocean using seismic waves from distant earthquakes recorded by seismometers on the ocean floor and on land. These results will be combined with numerical models and geochemical measurements to understand origins of these volcanic rocks. Broader impacts include support for undergraduate and graduate students.The goal of this study is to develop a better global understanding of the processes that produce intraplate volcanism by resolving the origins of the Holocene Auckland Volcanic Field (AVF). The AVF is spatially separated from the subduction zone arc, and its magmas do not bear obvious contributions from subduction-related melting. Neither are these magmas clearly connected to a lower mantle plume, based on existing seismic tomography and helium isotopes. Rather, geochemical data raise the possibility that the AVF magmas provide a global end-member case of mantle melting that emanates from transition zone depths, a class of intraplate volcanism that has recently emerged. However, other processes such as melting driven by upwelling related to lithospheric instabilities and small-scale convection cannot be ruled out, and even upwelling from the lower mantle needs to be further evaluated. New seismic data will be collected from a temporary array of 20 US seafloor broadband seismometers (OBSs). These stations will be complemented by New Zealand-based land arrays, and an OBS deployment from SUSTech (China). With the proposed array, seismic analyses will test for the presence or absence of seismic velocity and attenuation anomalies, transition zone discontinuity topography, and seismic anisotropy associated with the competing hypotheses. US work will be integrated with seismological and volcanological analyses by New Zealand collaborators and a SUSTech geodynamical modeling effort. Results from this synthesis will provide estimates of the depth extent of melting, volatile ascent, and the degree to which this intraplate volcanism is driven by processes in the lithosphere, transition zone, or both. A range of critical questions will be addressed, including: What is the thermal structure from surface to transition-zone depths? Does upwelling occur, and from what depth, and are lithospheric instabilities present? What pathways do fluids and melt take as they ascend, and how do those pathways interact with large-scale flow? How does volcanism far behind the arc interact with the subduction system, if at all? This project will support graduate and undergraduate students at Cornell and Brown, including students from historically marginalized groups. Results from the project will be incorporated in the outreach and teaching activities of the PIs. The proposed project will enhance international collaborations. The project will provide a better understanding of the deep drivers for volcanic hazards, including young (1 ka) volcanism within the Auckland urban area.This project is supported by the Marine Geology and Geophysics program in the Division of Ocean Sciences and the Geophysics program in the Division of Earth Sciences.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.
尽管地球的大部分火山发生在构造板之间的边界上,但许多其他火山发生在板室内。这些内部火山中的一些,例如夏威夷的火山,与热地幔相关,该地幔从下层中超过2500公里的深度向上流动。但是,其他人具有更神秘的起源。神秘类别中的一组火山爆发了熔岩,其化学反应与410 km至660 km的岩石的融化一致。新西兰奥克兰火山场是这种火山区的一个例子。该项目的目的是为这些火山区的熔化区域成像。这将通过测量新西兰北岛下面的地幔的性质和周围海洋的特性,并使用海底和陆地上的地震仪记录的地震仪记录的地震中的地震波。这些结果将与数值模型和地球化学测量相结合,以了解这些火山岩的起源。更广泛的影响包括对本科生和研究生的支持。这项研究的目的是通过解决全新世的奥克兰火山田(AVF)的起源来更好地全球了解产生板岩内火山的过程。 AVF在空间上与俯冲带弧线分离,其岩浆没有明显的与俯冲相关融化的贡献。基于现有的地震层析成像和氦同位素,这些岩浆都没有明确连接到较低的地幔李子。相反,地球化学数据增加了AVF岩浆提供了一个全球结束成员的地幔融化的情况,即从过渡区深度(最近出现的一类板岩内火山)提供了卵。但是,其他过程,例如通过与岩石圈不稳定相关的上升流以及小规模转换相关的熔化驱动器,甚至不排除较低地幔的上升,也需要进一步评估。新的地震数据将从20美国海底宽带地震仪的临时阵列(obss)收集。这些电台将由新西兰的土地阵列完成,以及来自Sustech(中国)的OBS部署。通过提出的阵列,地震分析将测试地震速度和衰减异常,过渡区不连续性地形以及与竞争假设相关的地震各向异性。美国的工作将与新西兰合作者和Suspech地球动力学建模工作的地震学和火山学分析相结合。该合成的结果将提供熔化,挥发性上升的深度以及该板岩内火山的程度由岩石圈,过渡区或两者兼而有之的程度的估计。将解决一系列关键问题,包括:从表面到过渡区深度的热结构是什么?上升的发生,以及岩石圈不存在的深度以及是否存在?流体和熔体上升时采取哪些途径,这些途径如何与大规模流动相互作用?如果有的话,火山症如何与俯冲系统相互作用?该项目将支持康奈尔(Cornell)和布朗(Brown)的毕业生和本科生,包括来自历史边缘化团体的学生。该项目的结果将纳入PI的外展和教学活动。拟议的项目将增强国际合作。该项目将更好地理解对火山危害的深层驱动因素,包括奥克兰市区内的年轻(1 ka)火山危机。该项目得到了海洋地质和地球物理学计划在海洋科学部和地球物理学部的支持,并在地球科学部中获得了地球科学划分。审查标准。
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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Geoffrey Abers其他文献
Geoffrey Abers的其他文献
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{{ truncateString('Geoffrey Abers', 18)}}的其他基金
Systematic mapping of magma bodies under Cascades volcanoes
喀斯喀特火山下岩浆体的系统制图
- 批准号:
2313452 - 财政年份:2023
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
Collaborative Research: RAPID: Response to the 29 July 2021 Chignik M8.2 Earthquake
合作研究:RAPID:对 2021 年 7 月 29 日奇格尼克 M8.2 地震的响应
- 批准号:
2147438 - 财政年份:2021
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
Collaborative Research: Synthesizing arc-scale geochemical, petrologic, and geophysical datasets to investigate causes of volcanic diversity in the Cascade Arc
合作研究:综合弧级地球化学、岩石学和地球物理数据集,研究喀斯喀特弧火山多样性的原因
- 批准号:
1948834 - 财政年份:2020
- 资助金额:
$ 38.93万 - 项目类别:
Continuing Grant
Collaborative Research: Behavior and structure on and around the megathrust revealed by the Alaska Amphibious Seismic Community Experiment
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- 批准号:
1949130 - 财政年份:2020
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
Collaborative research: Structure and dynamics of the Alaska mantle wedge
合作研究:阿拉斯加地幔楔的结构和动力学
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1829440 - 财政年份:2018
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
Alaska Amphibious Community Seismic Experiment
阿拉斯加两栖社区地震实验
- 批准号:
1654568 - 财政年份:2017
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
Collaborative Research: Fate and Consequences of Yakutat Terrane Subduction Beneath Eastern Alaska and the Wrangell Volcanic Field
合作研究:阿拉斯加东部和兰格尔火山场下雅库塔特地体俯冲的命运和后果
- 批准号:
1460291 - 财政年份:2015
- 资助金额:
$ 38.93万 - 项目类别:
Continuing Grant
Thermal and melt structure of the Juan de Fuca plate from ridge to trench to arc, inferred from seismic attenuation across the Amphibious Array
根据两栖阵列的地震衰减推断,胡安德富卡板块从山脊到海沟再到弧线的热结构和熔体结构
- 批准号:
1536566 - 财政年份:2015
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
MARGINS: Collaborative Research: Illuminating the Architecture of the Greater Mount St. Helens Magmatic System from Slab to Surface
边缘:合作研究:阐明大圣海伦斯山岩浆系统从板块到地表的结构
- 批准号:
1444275 - 财政年份:2014
- 资助金额:
$ 38.93万 - 项目类别:
Continuing Grant
Collaborative Research: the role of fluids in intermediate-depth seismicity and wedge anisotropy: Case studies for Cascadia and Alaska, with a comparison to Japan
合作研究:流体在中深度地震活动和楔形各向异性中的作用:卡斯卡迪亚和阿拉斯加的案例研究,并与日本进行比较
- 批准号:
1446970 - 财政年份:2014
- 资助金额:
$ 38.93万 - 项目类别:
Standard Grant
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