Constraining Mantle Rheology at Lithospheric Conditions by Modeling Seamount Induced Deformation and Gravity Anomalies
通过模拟海山引起的变形和重力异常来约束岩石圈条件下的地幔流变
基本信息
- 批准号:1114168
- 负责人:
- 金额:$ 19.66万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-10-01 至 2015-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The surface layer of the solid Earth is called lithosphere that is on average about 100 km thick and includes the crust and mantle components. The lithosphere is relatively cold (i.e., temperature less than ~1200 C) and deforms in both brittle and plastic fashions under stresses. Mantle rheology at lithospheric conditions (i.e., temperature less than 1200 C) describes quantitatively the lithospheric deformation under stress, and is important for understanding long-term tectonic deformation, mountain building, volcanism, lithospheric thinning, and plate tectonics. Most studies on mantle lithospheric rheology employ a laboratory approach and investigate the response of rock samples or specimen to applied stress in laboratory settings. Although laboratory studies have provided many important insights on lithospheric rheology, it remains challenging to directly apply them in studies of lithospheric deformation processes. This project seeks to constrain lithospheric rheology by directly modeling observations of surface and Moho deflections and gravity anomalies associated with seamount and oceanic island loads at plate interiors and in subduction zones. Seamounts and oceanic islands are formed on oceanic lithosphere due to volcanic eruptions on a short time scale (~ 1 million years or less). They cause significant deformation on oceanic lithosphere that can be observed in deformation of sedimentary layers and gravity anomalies. The loading of seamount and oceanic islands (e.g., Hawaii) on lithosphere can therefore be viewed as a natural laboratory to study the lithospheric response to stress or loading. This project seeks to address the following questions: 1) What is the lithospheric strength (stress) and rheology at plate interiors and in subduction zones? 2) How does lithospheric viscosity vary with temperature (i.e., activation energy)? 3) Is the mantle rheology inferred from modeling field-based observations consistent with that inferred from recent laboratory studies? 4) What are the rheological effects of subduction processes such as faulting, bending and hydration, as seen by subduction zone seamounts? The specific tasks for the proposed two-year project include: 1) to formulate 2- and 3-D finite element viscoelastic loading models with realistic rheologies including viscoelastic, nonlinear creep, and frictional (i.e., Byerlee's law) rheology, 2) to use recent compilations of elastic plate thickness, plate age, load age and size for ~80 seamounts and oceanic islands to constrain mantle rheology at lithospheric conditions including the activation energy, 3) to use seismically imaged deflected crust data, load and lithospheric ages, gravity data for selected intraplate oceanic islands (Hawaii, La Reunion, Canary, Cape Verde, and Marquesas) and subduction zone seamounts (the Louisville Ridge seamount near the Kermadec trench and the Daiichi-Kashima seamount in the Japan Trench) in 3-D loading models to further constrain the rheology in different tectonic settings.This project is supported by the Geophysics and Marine Geology & Geophysics Programs.
固体地球的表层被称为岩石圈,平均厚度约为100公里,包括地壳和地幔成分。岩石圈相对较冷(即温度低于~1200℃),在应力作用下以脆性和塑性两种形式变形。岩石圈条件下(即温度低于1200℃)的地幔流变学定量描述了岩石圈在应力作用下的变形,对理解长期构造变形、造山、火山作用、岩石圈减薄和板块构造具有重要意义。大多数地幔岩石圈流变学研究采用实验室方法,在实验室环境下研究岩石样品或标本对外加应力的响应。尽管实验室研究为岩石圈流变学提供了许多重要的见解,但将其直接应用于岩石圈变形过程的研究仍然具有挑战性。该项目旨在通过直接模拟观测到的与板块内部和俯冲带的海山和海洋岛屿载荷相关的地表和莫霍变形以及重力异常,来限制岩石圈流变。海山和海洋岛屿是火山喷发在短时间(~ 100万年或更短)内形成于海洋岩石圈上的。它们引起了海洋岩石圈的显著变形,这种变形可以在沉积层变形和重力异常中观察到。因此,海底山和海洋岛屿(如夏威夷)对岩石圈的负荷可以看作是研究岩石圈对应力或负荷反应的天然实验室。本项目旨在解决以下问题:1)板块内部和俯冲带的岩石圈强度(应力)和流变性是什么?2)岩石圈粘度如何随温度(即活化能)变化?3)从模拟现场观测推断的地幔流变学与最近实验室研究推断的地幔流变学一致吗?4)俯冲带海山的断裂、弯曲、水化等俯冲过程对流变学的影响是什么?建议的两年计划的具体任务包括:1)建立二维和三维有限元粘弹性加载模型,包括粘弹性、非线性蠕变和摩擦(即Byerlee定律)流变学;2)利用最近汇编的约80个海山和海洋岛屿的弹性板块厚度、板块年龄、载荷年龄和尺寸来约束岩石圈条件下的地幔流变学,包括活化能;3)利用地震成像的变形地壳数据、载荷和岩石圈年龄。选取板块内海洋岛屿(夏威夷、留尼汪岛、加那利岛、佛得角和马克萨斯岛)和俯冲带海山(Kermadec海沟附近的路易斯维尔海山和日本海沟的第一岛海山)的重力数据,在三维加载模型中进一步约束不同构造环境下的流变学。该项目由地球物理和海洋地质与地球物理项目支持。
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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Shijie Zhong其他文献
The effects of laterally varying icy shell structure on the tidal response of Ganymede and Europa
横向变化的冰壳结构对木卫三和木卫二潮汐响应的影响
- DOI:
10.1002/2013je004570 - 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
J. Wahr;J. Wahr;Shijie Zhong - 通讯作者:
Shijie Zhong
Goal-Oriented Bayesian Optimal Experimental Design for Nonlinear Models using Markov Chain Monte Carlo
使用马尔可夫链蒙特卡罗的非线性模型的面向目标贝叶斯最优实验设计
- DOI:
- 发表时间:
2024 - 期刊:
- 影响因子:0
- 作者:
Shijie Zhong;Wanggang Shen;Tommie A. Catanach;Xun Huan - 通讯作者:
Xun Huan
Separation and Purification of Quinolone Alkaloids from the Chinese Herbal Medicine Evodia rutaecarpa (Juss.) Benth by High Performance Counter-Current Chromatography
高效逆流色谱法分离纯化中药吴茱萸中喹诺酮类生物碱
- DOI:
- 发表时间:
2011 - 期刊:
- 影响因子:0
- 作者:
Shijie Zhong;Hao;A. Peng;Jie Shi;Shichao He;Shucai Li;Xia Ye;Ming;Li - 通讯作者:
Li
Influence of thermochemical piles on topography at Earth's core–mantle boundary
- DOI:
10.1016/j.epsl.2007.07.015 - 发表时间:
2007-09-30 - 期刊:
- 影响因子:
- 作者:
Teresa Mae Lassak;Allen K. McNamara;Shijie Zhong - 通讯作者:
Shijie Zhong
The relationship between gravity anomalies and topography in the Pacific Ocean and its implications for flexural isostasy, mantle viscosity and dynamics
太平洋重力异常与地形之间的关系及其对挠曲均衡、地幔粘度和动力学的影响
- DOI:
10.1016/j.epsl.2025.119246 - 发表时间:
2025-04-01 - 期刊:
- 影响因子:5.100
- 作者:
An Yang;A.B. Watts;Shijie Zhong - 通讯作者:
Shijie Zhong
Shijie Zhong的其他文献
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{{ truncateString('Shijie Zhong', 18)}}的其他基金
Investigating Effects of Transient and Non-Newtonian Mantle Viscosity on Glacial Isostatic Adjustment Process and their Implications for GPS Observations in Antarctica
研究瞬态和非牛顿地幔粘度对冰川均衡调整过程的影响及其对南极 GPS 观测的影响
- 批准号:
2333940 - 财政年份:2024
- 资助金额:
$ 19.66万 - 项目类别:
Standard Grant
EAR - Climate; Investigating Effects of 3-Dimensional and Non-Newtonian Mantle Viscosity on Relative Sea-Level Changes and Deglaciation History Since the Last Glacial Maximum
EAR——气候;
- 批准号:
2222115 - 财政年份:2022
- 资助金额:
$ 19.66万 - 项目类别:
Standard Grant
Constraining Frictional and Low-Temperature Plastic Rheology of Oceanic Lithosphere by Modeling Observations of Load-Induced Deformation from the Hawaiian Islands to Japan Trench
通过模拟从夏威夷群岛到日本海沟的荷载引起的变形观测来约束海洋岩石圈的摩擦和低温塑性流变
- 批准号:
1940026 - 财政年份:2019
- 资助金额:
$ 19.66万 - 项目类别:
Standard Grant
Contraining the large-scale dynamics and structure of the lower mantle using observations of the geoid, dynamic topography and plate tectonics
利用大地水准面、动态地形和板块构造的观测来约束下地幔的大尺度动力学和结构
- 批准号:
1645245 - 财政年份:2017
- 资助金额:
$ 19.66万 - 项目类别:
Continuing Grant
Investigating the consequences of Supercontinent Pangea assembly and breakup on the time evolution of large-scale mantle thermochemical structures and magmatism
研究超大陆盘古大陆的组装和破碎对大尺度地幔热化学结构和岩浆作用时间演化的影响
- 批准号:
1015669 - 财政年份:2010
- 资助金额:
$ 19.66万 - 项目类别:
Continuing Grant
CSEDI Collaborative Research: Neutrino Geophysics: collaboration between geology and particle physics
CSEDI 合作研究:中微子地球物理学:地质学和粒子物理学之间的合作
- 批准号:
0855712 - 财政年份:2009
- 资助金额:
$ 19.66万 - 项目类别:
Continuing Grant
Collaborative Research: Understanding the Dynamics of the Earth: High resolution mantle convection simulation on petascale computers
合作研究:了解地球动力学:千万亿级计算机上的高分辨率地幔对流模拟
- 批准号:
0749045 - 财政年份:2007
- 资助金额:
$ 19.66万 - 项目类别:
Continuing Grant
The Formation of Long-wavelength Mantle Structure and Its Relationship to Supercontinent Cycles and True Polar Wander
长波长地幔结构的形成及其与超大陆旋回和真极地漂移的关系
- 批准号:
0711366 - 财政年份:2007
- 资助金额:
$ 19.66万 - 项目类别:
Continuing Grant
Acquisition of a PC Cluster for Geophysical Modeling
获取用于地球物理建模的 PC 集群
- 批准号:
0650957 - 财政年份:2007
- 资助金额:
$ 19.66万 - 项目类别:
Standard Grant
Constraining Thermo-Chemical Mantle Convection from Observations of Mantle Plumes and Upper Mantle Temperature
从地幔柱和上地幔温度的观测来约束地幔热化学对流
- 批准号:
0538255 - 财政年份:2006
- 资助金额:
$ 19.66万 - 项目类别:
Standard Grant
相似海外基金
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地震带底部地幔岩石圈流变学的实验约束
- 批准号:
2054522 - 财政年份:2021
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Transient rheology of upper mantle inferred from the postseismic deformation of 2011 Tohoku-oki earthquake
从2011年东北大地震震后形变推断的上地幔瞬态流变学
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1953849 - 财政年份:2020
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Priority Programmes
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