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
基本信息
- 批准号:1015669
- 负责人:
- 金额:$ 24.6万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-10-01 至 2014-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project seeks to constrain the evolution of mantle structure since Paleozoic, associated with the assembly and breakup of Pangea, by using geological observations of intraplate magmatism, long-term sea level changes, and true polar wander (TPW) in the same time period. The present-day Earth's mantle is predominated by spherical harmonic degree-2 structure that is characterized by the two antipodal, major seismically slow anomalies under Africa and central Pacific (i.e., the African and Pacific superplumes) and circum-Pacific seismically fast anomalies. This degree-2 long-wavelength mantle structure is associated with the plate motion history. Observations of supercontinent cycles (i.e, assembly and breakup of Pangea and Rodinia) for the last 1 Ga and geodynamic considerations suggest that the mantle may have been predominated by even longer-wavelength structure possibly at degree 1 during supercontinent assembly. Because mantle convective structure controls heat transfer and chemical mixing in the mantle, and geology and tectonics at the Earth's surface, it is important to understand the time evolution of Earth's mantle structure. 3-D spherical models of compressible, thermochemical convection with realistic mantle rheology and plate motion history constrained by the paleogeography (i.e., Pangea assembly and breakup) will be formulated to test the following two hypotheses regarding intraplate magmatism: 1) The reduced level of intraplate magmatism before Pangea assembly and ~100 Ma after, results from the convergence of continental plates (e.g., Gondwana and Laurassia) that cool the mantle in the African hemisphere, while the subsequent enhanced magmatism associated with Pangea breakup is caused by formation of the African superplume structure as a result of circum-Pangea subduction induced upwelling return-flow below Pangea. The implication is that the mantle in the African hemisphere may have been relatively cold before the African superplume structure is formed ~100 Ma after Pangea assembly. 2) The correlation between eruption sites of intraplate magmatism and the boundaries of the African and Pacific seismic anomalies near the core-mantle boundary (CMB) is characteristic of thermochemical convection in which the dense component near the CMB is only moderately denser than the ambient mantle, but inconsistent with purely thermal convection or layered mantle convection with a flat chemical interface. While the proposed convection models reproduce the general features of mantle structure, surface dynamic topography, and the geoid (i.e., rotational pole position) for the present-day Earth, the observations of long-term TPW and sea level changes which are controlled by long-wavelength dynamic topography and geoid, pose constraints on global mantle structure evolution, particularly that in the Pacific hemisphere during Pangea time.
该项目试图通过对板内岩浆活动、长期海平面变化和同一时期的真极移(TPW)的地质观测,来限制古生代以来与盘古大陆组装和裂解有关的地幔结构的演化。现今地球地幔以球谐2度结构为主,其特征是非洲和中太平洋下的两个对跖的主要地震慢异常(即,非洲和太平洋超级羽流)和环太平洋地震快速异常。这种2度长波地幔结构与板块运动历史有关。超大陆周期(即组装和解体的盘古大陆和Rodinia)的最后1 Ga和地球动力学的考虑的观测表明,地幔可能已占主导地位,甚至更长的波长结构可能在度1超大陆组装。由于地幔对流结构控制着地幔中的热传递和化学混合,以及地球表面的地质和构造,因此了解地球地幔结构的时间演化是重要的。可压缩热化学对流的三维球形模型,具有受古地理学约束的真实地幔流变学和板块运动历史(即,Pangea组装和解体)将被制定来测试以下两个假设关于板内岩浆活动:1)板内岩浆活动的减少水平在Pangea组装之前和大约100 Ma之后,由于大陆板块的会聚(例如,古大陆板块(Gondwana and Laurassia)的俯冲作用冷却了非洲半球的地幔,而随后与盘古大陆裂解相关的岩浆活动增强则是由于环盘古大陆俯冲作用导致盘古大陆下的上涌回流而形成非洲超级地幔柱结构所致。这意味着在非洲超级地幔柱构造形成之前,非洲半球的地幔可能是相对寒冷的,大约在盘古大陆组装后100 Ma。2)板内岩浆活动的喷发部位与核幔边界附近的非洲和太平洋地震异常边界之间的相关性是热化学对流的特征,其中靠近核幔边界的致密组分仅比环境地幔的密度适中,但与纯热对流或具有平坦化学界面的层状地幔对流不一致。虽然所提出的对流模型再现了地幔结构、表面动力学地形和大地水准面(即,地球自转极位置),长波长动力地形和大地水准面控制下的长时间TPW和海平面变化观测,对全球地幔结构演化,特别是泛古陆时期太平洋地区的地幔结构演化具有制约作用。
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)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
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
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
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
Shijie Zhong的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ 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:
$ 24.6万 - 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:
$ 24.6万 - 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:
$ 24.6万 - 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:
$ 24.6万 - 项目类别:
Continuing Grant
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
- 批准号:
1114168 - 财政年份:2011
- 资助金额:
$ 24.6万 - 项目类别:
Standard 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:
$ 24.6万 - 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:
$ 24.6万 - 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:
$ 24.6万 - 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:
$ 24.6万 - 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:
$ 24.6万 - 项目类别:
Standard Grant
相似国自然基金
Exposing Verifiable Consequences of the Emergence of Mass
- 批准号:12135007
- 批准年份:2021
- 资助金额:313 万元
- 项目类别:重点项目
Accretion variability and its consequences: from protostars to planet-forming disks
- 批准号:12173003
- 批准年份:2021
- 资助金额:60 万元
- 项目类别:面上项目
Consequences of MALT1 mutation for B cell tolerance
- 批准号:
- 批准年份:2021
- 资助金额:30 万元
- 项目类别:青年科学基金项目
相似海外基金
Conference: 2024 Thiol-Based Redox Regulation and Signaling GRC and GRS: Mechanisms and Consequences of Redox Signaling
会议:2024年基于硫醇的氧化还原调节和信号传导GRC和GRS:氧化还原信号传导的机制和后果
- 批准号:
2418618 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Standard Grant
Collaborative Research: REU Site Mystic Aquarium: Plankton to Whales: Consequences of Global Change within Marine Ecosystems
合作研究:REU 站点神秘水族馆:浮游生物到鲸鱼:海洋生态系统内全球变化的后果
- 批准号:
2349354 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Continuing Grant
Fitness and evolutionary consequences of developmental plasticity
发育可塑性的适应性和进化后果
- 批准号:
DP240102830 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Discovery Projects
The demographic consequences of extreme weather events in Australia
澳大利亚极端天气事件对人口的影响
- 批准号:
DP240102733 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Discovery Projects
Intended and unintended consequences of the ZnO ban from pig diets on antimicrobial resistance, post-weaning diarrhoea and the microbiome
猪日粮中禁用氧化锌对抗菌素耐药性、断奶后腹泻和微生物组的有意和无意的影响
- 批准号:
BB/Y003861/1 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Research Grant
NGO-Prosecutorial Complex in Universal Jurisdiction Cases: Structure and Consequences for Justice and Public Knowledge about Human Rights Violations
普遍管辖权案件中的非政府组织-检察复合体:正义的结构和后果以及公众对侵犯人权行为的了解
- 批准号:
2314061 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Assessing the physiological consequences of diet and environment for gorillas in zoological settings
博士论文研究:评估动物环境中大猩猩饮食和环境的生理后果
- 批准号:
2341433 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Standard Grant
Understanding the motives and consequences of parents' educational investment : Competition, Parental Aversion, and Intergenerational mobility.
了解父母教育投资的动机和后果:竞争、父母厌恶和代际流动。
- 批准号:
24K16383 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Grant-in-Aid for Early-Career Scientists
Intended and unintended consequences of the ZnO ban from pig diets on antimicrobial resistance, post-weaning diarrhoea and the microbiome.
猪日粮中禁用氧化锌对抗菌素耐药性、断奶后腹泻和微生物组的有意和无意的影响。
- 批准号:
BB/Y004108/1 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Research Grant
The rise of self-avatars in collaborative virtual environments and their consequences for users' mental well-being
协作虚拟环境中自我化身的兴起及其对用户心理健康的影响
- 批准号:
ES/X010899/1 - 财政年份:2024
- 资助金额:
$ 24.6万 - 项目类别:
Research Grant