CAREER: Investigating the Relationship Between Mantle Shear Localization, Melt Flow and Water Content

职业：研究地幔剪切定位、熔体流动和含水量之间的关系

• 批准号: 1625032
• 负责人: Jessica Warren
• 金额: $ 36.59万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-10-01 至 2020-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1625032&HistoricalAwards=false
• 关键词: CAREER; Investigating; Relationship; Between; Mantle

The occurrence of shear localization is one of the defining properties of plate tectonics, but the mechanisms driving shear localization are poorly constrained. Both melt and water have been proposed as agents that lead to ductile localization within the Earth?s mantle. This CAREER research project investigates the relationship between shear localization, melt flow and water through analysis of well-preserved shear zones in one of the best examples of mantle peridotite, the Josephine peridotite in Oregon. Terrestrial laser scanning will be used to map shear zones at high resolution, with the survey being carried out as part of an undergraduate field class. The survey results will be merged with GPS data on the location and orientation of shear zones and melt channels. Microstructural analysis of samples collected during fieldwork will be carried out to determine the relationship between mineral orientations and variations in melt and water contents. Analysis of water concentrations in peridotite pyroxenes will be used to constrain the outcrop-scale variation in water in relation to shear deformation. The education component of this CAREER project will provide undergraduate and graduate students with experience in advanced field methods through the use of terrestrial laser scanning. Experience with cutting-edge analytical techniques and field campaign planning will prepare students for future careers in the geosciences. Integration of teaching and research in this project will expose students to a variety of topics and techniques across a range of disciplines, including petrology, geochemistry, rock deformation, tectonics and seismology.The research in this proposal lies at the intersection of petrology, geochemistry, rock deformation, tectonics, and seismology. Project results will be widely applicable across disciplines. For example, the combination of microstructural analyses with peridotite geochemistry will provide insight into the factors that control seismic anisotropy. Results of this project will also be applicable to themes identified in the 2011 GeoPRISMS Implementation Plan, including (i) understanding mantle wedge dynamics; (ii) fore-arc to back-arc volatile fluxes and (iii) metamorphism, melting, and fluid/melt migration in the mantle wedge.

剪切局部化的发生是板块构造的定义性质之一，但驱动剪切局部化的机制却知之甚少。熔体和水都被认为是导致地球内部韧性局部化的因素。地幔。这个CAREER研究项目通过分析俄勒冈州约瑟芬橄榄岩中保存完好的剪切带，研究剪切局部化、熔体流动和水之间的关系。约瑟芬橄榄岩是地幔橄榄岩的最好例子之一。地面激光扫描将用于绘制高分辨率剪切带，该调查将作为本科实地课程的一部分进行。调查结果将与关于剪切带和融化通道的位置和方向的GPS数据合并。将对在实地工作中收集的样品进行微观结构分析，以确定矿物取向与熔体和水含量变化之间的关系。橄榄岩辉石中的水浓度分析将用于约束与剪切变形有关的露头尺度的水变化。该CAREER项目的教育部分将通过使用地面激光扫描为本科生和研究生提供先进的现场方法经验。具有尖端分析技术和实地活动规划的经验将为学生未来在地球科学领域的职业生涯做好准备。该项目将教学和研究相结合，使学生接触到不同学科的各种主题和技术，包括岩石学、地球化学、岩石变形、构造学和地震学。本提案的研究是岩石学、地球化学、岩石变形、构造学和地震学的交叉。项目成果将广泛适用于各个学科。例如，将微观结构分析与橄榄岩地球化学相结合，将有助于深入了解控制地震各向异性的因素。该项目的结果也将适用于2011年地球地质系统实施计划中确定的主题，包括(i)理解地幔楔体动力学；（二）弧前到弧后的挥发性通量；（三）地幔楔中的变质作用、熔融作用和流体/熔体迁移。

项目成果

Evolution of the Josephine Peridotite Shear Zones: 1. Compositional Variation and Shear Initiation

约瑟芬橄榄岩剪切带的演化：1.成分变化和剪切引发

• DOI: 10.1029/2019gc008399
• 发表时间: 2019
• 期刊: Geosystems
• 作者: Kumamoto, Kathryn M.;Warren, Jessica M.;Hauri, Erik H.
• 通讯作者: Hauri, Erik H.

Evolution of the Josephine Peridotite Shear Zones: 2. Influences on Olivine CPO Evolution

• DOI: 10.1029/2019jb017968
• 发表时间: 2019-12
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: K. Kumamoto;J. Warren;L. Hansen

The Effect of Intracrystalline Water on the Mechanical Properties of Olivine at Room Temperature

室温下结晶水对橄榄石力学性能的影响

• DOI: 10.1029/2023gl106325
• 发表时间: 2024
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Kumamoto, Kathryn M.;Hansen, Lars N.;Breithaupt, Thomas;Wallis, David;Li, Bo‐Shiuan;Armstrong, David E. J.;Goldsby, David L.;Li, Yang;Warren, Jessica M.;Wilkinson, Angus J.
• 通讯作者: Wilkinson, Angus J.

The impact of water on slip system activity in olivine and the formation of bimodal crystallographic preferred orientations

水对橄榄石滑移系统活性的影响及双峰晶体择优取向的形成

• DOI: 10.1016/j.epsl.2018.12.007
• 发表时间: 2019
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Wallis, D.;Hansen, L.N.;Tasaka, M.;Kumamoto, K.M.;Parsons, A.J.;Lloyd, G.E.;Kohlstedt, D.L.;Wilkinson, A.J.
• 通讯作者: Wilkinson, A.J.

Dislocation interactions during low-temperature plasticity of olivine and their impact on the evolution of lithospheric strength

• DOI: 10.1016/j.epsl.2020.116349
• 发表时间: 2020-08
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: D. Wallis;L. Hansen;K. Kumamoto;C. Thom;O. Plümper;M. Ohl;W. Durham;D. Goldsby;D. Armstrong;C. Meyers;R. Goddard;J. Warren;T. Breithaupt;M. Drury;A. Wilkinson