Seismicity of peridotite alteration
橄榄岩蚀变的地震活动
基本信息
- 批准号:2147529
- 负责人:
- 金额:$ 45.28万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-06-01 至 2025-05-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The Earth's mantle is a layer of silicate rock found in between the crust and the outer core that represents ~67% of its mass and ~84% of its volume. Mantle rocks are rarely observed on the Earth's surface because they are covered by the crust. Yet, the upper part of the mantle, which is composed of peridotite, is commonly exposed on the seafloor, and occasionally exposed on land in geological features called ophiolites. When peridotite is exposed to, and reacts with, water, it undergoes chemical reactions that change the composition of both the rocks and the water. This process, known as alteration, results in carbon being transferred from the water to the rocks. Peridotite alteration is thus a natural process that sequesters carbon in the Earth's interior. This project uses data from a unique seismic experiment - conducted at the world's largest ophiolite in Oman - to determine how fast this natural process sequesters carbon. The project provides support to a post-doctoral associate at Woods Hole Oceanographic Institution. It fosters international collaboration with the Sultana of Oman, Czech Republic, and the UK. Its outcomes are directly relevant to applications in engineered CO2 capture and enhanced geothermal systems.Peridotite alteration is a fundamentally important process for a spectrum of geoscience topics. These include arc volcanism, earthquake processes, the carbon cycle, and chemosynthetic biological communities. Although fully altered peridotites (serpentinites, listvenites, soapstones) are commonly observed in outcrops, it is unclear how this can happen because alteration reactions are typically self-limiting. In most geological systems alteration products armor reactive surfaces and reduce pore space, which eventually halts the alteration process. It has been proposed that reaction-driven cracking - due to volume increase during serpentinization and carbonation of mantle rocks - is the key process that perpetuates alteration by creating and/or maintaining permeable pathways for continued fluid flow. In principle, this process should generate very small cracking events with volume change (isotropic) focal mechanism components. But such events have never been observed in situ. Here the team acquired a unique seismic dataset with short inter-element spacings (order meters) and 1 kHz sampling at a site of ongoing peridotite alteration to study its seismogenic character. They determine if the very small earthquakes detected by the seismic network represent cracking from peridotite alteration. They interpret the results in the context of the multi-disciplinary studies (hydrology, petrology, microbiology) conducted at the study site. The results provide new insight into the complex set of processes that occur when water interacts with peridotite. These processes occur over vast expanses of the Earth's solid surface.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.
地球的地幔是在地壳和外部芯之间发现的一层硅酸盐岩石,占其质量的约67%,约为其体积的84%。地幔岩石在地球表面很少被观察到,因为它们被外壳覆盖。然而,由橄榄岩组成的地幔的上部通常暴露在海底,偶尔在土地上以地质特征暴露在土地上,称为蛇绿岩。当橄榄岩暴露于水并反应水时,它会经历化学反应,从而改变岩石和水的组成。这个被称为改变的过程导致碳从水转移到岩石上。因此,橄榄岩的改变是一种自然过程,可隔离地球内部碳。该项目使用来自阿曼世界上最大的蛇绿岩进行的独特地震实验的数据,以确定这种自然过程隔离碳的速度。该项目为伍兹孔海洋学机构的博士后助理提供了支持。 它促进了与阿曼,捷克共和国和英国的国际合作。 它的结果与工程二氧化碳捕获和增强的地热系统的应用直接相关。陶土改变是一系列地球科学主题的根本重要过程。这些包括弧火山,地震过程,碳循环和化学合成生物群落。尽管通常在露头中观察到完全改变的橄榄岩(蛇丁丁矿,Listvenites,肥皂石),但尚不清楚这是如何发生的,因为改变反应通常是自限制的。在大多数地质系统中,改变产品装甲反应表面并减少孔隙空间,最终阻止了变化过程。已经提出,反应驱动的裂纹 - 由于蛇形岩石的体积增加和地幔岩石的碳化而引起的裂纹 - 是通过创建和/或维持持续流体流动的可渗透途径来使变化永久变化的关键过程。原则上,此过程应通过体积变化(各向同性)焦点机理成分产生非常小的开裂事件。但是从未观察到这样的事件。在这里,该团队在正在进行的橄榄石改变的位点上获得了一个独特的地震数据集,其元素间间距短(订单计)和1 kHz采样,以研究其地震生成特征。他们确定地震网络检测到的非常小的地震是否代表了橄榄岩改变的破裂。他们解释了在研究地点进行的多学科研究(水文,质学,微生物学)的背景下。结果为水与橄榄岩相互作用时发生的复杂过程提供了新的见解。这些过程发生在地球稳定表面的广泛扩展中。该奖项反映了NSF的法定任务,并被认为是值得通过基金会的知识分子优点评估和更广泛的影响标准通过评估来支持的。
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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Robert Sohn其他文献
Robert Sohn的其他文献
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{{ truncateString('Robert Sohn', 18)}}的其他基金
Collaborative Research: Investigating the Detachment Fault Cycle at the Mid-Cayman Spreading Center
合作研究:调查开曼中部扩张中心的脱离断层旋回
- 批准号:
2104492 - 财政年份:2022
- 资助金额:
$ 45.28万 - 项目类别:
Continuing Grant
Collaborative Research: Laboratory and theoretical study of geyser dynamics
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2050785 - 财政年份:2021
- 资助金额:
$ 45.28万 - 项目类别:
Standard Grant
RAPID: Short-period Seismic Study of Actively Serpentinizing Lithosphere in the Oman Ophiolite
RAPID:阿曼蛇绿岩岩石圈活跃蛇纹石化的短期地震研究
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1945305 - 财政年份:2019
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$ 45.28万 - 项目类别:
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Collaborative Research: The origin and propagation of shallow water microseisms: a multidisciplinary study at Yellowstone Lake
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1760056 - 财政年份:2018
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$ 45.28万 - 项目类别:
Continuing Grant
Collaborative Research: Modeling Hydrothermal Recharge and Outflow in Oceanic Crust Analogs with Sharp Permeability Gradients
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- 批准号:
1536705 - 财政年份:2015
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$ 45.28万 - 项目类别:
Standard Grant
Seismicity and Fault Structure of Oceanic Detachment Faults
大洋拆离断层的地震活动与断层结构
- 批准号:
1458084 - 财政年份:2015
- 资助金额:
$ 45.28万 - 项目类别:
Standard Grant
Collaborative Research: Alteration of Mantle Peridotite: Geochemical Fluxes and Dynamics of Far from Equilibrium Transport
合作研究:地幔橄榄岩的蚀变:地球化学通量和远离平衡输运的动力学
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1516313 - 财政年份:2015
- 资助金额:
$ 45.28万 - 项目类别:
Standard Grant
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合作研究:大陆热液系统对构造、岩浆和气候强迫的响应
- 批准号:
1516361 - 财政年份:2015
- 资助金额:
$ 45.28万 - 项目类别:
Continuing Grant
Analysis of Hydraulic Seismicity at the TAG Hydrothermal Mound
TAG热液丘水力地震活动分析
- 批准号:
0647221 - 财政年份:2007
- 资助金额:
$ 45.28万 - 项目类别:
Continuing Grant
Collaborative Research: Hydrothermal Processes on the Gakkel Ridge
合作研究:Gakkel 海脊的热液过程
- 批准号:
0425838 - 财政年份:2004
- 资助金额:
$ 45.28万 - 项目类别:
Standard Grant
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RUI: Collaborative Research: Constraining peridotite alteration timescales with environmental tracers (3H, 39Ar, 14C and 81Kr)
RUI:合作研究:用环境示踪剂(3H、39Ar、14C 和 81Kr)约束橄榄岩蚀变时间尺度
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2127529 - 财政年份:2021
- 资助金额:
$ 45.28万 - 项目类别:
Standard Grant
Collaborative Research: Alteration of mantle peridotite: Geochemical fluxes and dynamics of far from equilibrium transport
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Collaborative Research: Alteration of Mantle Peridotite: Geochemical Fluxes and Dynamics of Far from Equilibrium Transport
合作研究:地幔橄榄岩的蚀变:地球化学通量和远离平衡输运的动力学
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$ 45.28万 - 项目类别:
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Collaborative Research: Alteration of mantle peridotite: Geochemical fluxes and dynamics of far from equilibrium transport
合作研究:地幔橄榄岩的蚀变:地球化学通量和远离平衡传输的动力学
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