Shear-Induced Fabric and Weakening of Olivine and Dependence on Pressure and Water
剪切诱导的织物和橄榄石的弱化以及对压力和水的依赖性
基本信息
- 批准号:0636011
- 负责人:
- 金额:$ 19万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2007
- 资助国家:美国
- 起止时间:2007-01-01 至 2009-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
An experimental study is being conducted to determine the deformation mechanisms and fabric development of olivine aggregates deformed in a shear geometry at high pressures and known water contents. The deformation mechanisms and lattice preferred orientations of olivine control the physical properties and seismic anisotropy of the upper mantle. The deformation mechanisms and relative shear strengths of slip systems in olivine are well known under the dry conditions that characterize much of the oceanic lithosphere. Lattice preferred orientations of olivine produced in low pressure (300 MPa) deformation experiments in gas apparatus and modeled numerically correspond well to in situ seismic anisotropy of the upper mantle; shear on (010)[100] and (0kl)[100] leads to seismically fast crystallographic a axes aligned with the shear direction at oceanic spreading centers. Recent results of shear experiments performed at high pressure (2 GPa) in a solid medium apparatus indicate that remarkably different olivine fabrics develop during deformation at wet conditions. Lattice preferred orientations developed at high pressure have been linked to dislocation glide dominantly on (010)[001] and (100)[001]; presumably, reductions in critical resolved shear stresses of these slip systems are brought about by interactions with hydrogen point defects that have high solubilities in olivine at pressures greater than 1 GPa. Based on these results, the seismically fast direction can be aligned perpendicular to the shear direction, with important consequences for geodynamic interpretations of seismic anisotropy. Similar fabrics have been observed in some naturally deformed peridotites, and these fabrics are thought to have been developed under wet conditions, such as in subduction zones where downgoing slabs release fluids. However, the high pressure olivine fabrics related to shear in the [001] direction observed in high pressure experiments using the solid medium assembly have not been reproduced in olivine aggregates sheared at 1.6 GPa using the molten salt assembly. The advantage of using the molten salt assembly is that stress can be measured with a resolution not attained using solid medium assemblies, so that accurate mechanical data can be collected and applied to geodynamic problems. Another difference between the results obtained with the molten salt assembly and previous experimental work is that the strengths measured in the molten salt assembly are considerably lower than strengths of olivine deformed in the gas apparatus at the same temperature, strain rate and water content, but different confining pressures (1.6 vs. 0.3 GPa). To ensure that strengths measured at high pressure are accurate, the methods of measuring stress in the molten salt assembly are being refined and compared with measurements of shear stress in a high resolution triaxial gas apparatus using metals, whose strengths are not pressure dependent. This research follows from experimental studies of Holyoke and Tullis, who performed high pressure (1.6 GPa) deformation experiments using a molten salt cell and obtained fabrics similar to those developed at lower pressure (300 MPa). These experiments are designed to bridge the gaps between disparate results of different experimental methods, to improve our understanding of the deformation mechanisms in the mantle, characterize those conditions that favor different lattice preferred orientations, and evaluate rheologies that govern the geodynamics of the mantle.
目前正在进行一项实验研究,以确定在高压和已知含水量下以剪切几何形状变形的橄榄石聚集体的变形机制和结构发展。橄榄石的变形机制和晶格优选方向控制着上地幔的物理性质和地震各向异性。在海洋岩石圈的干燥条件下,橄榄石滑动系统的变形机制和相对剪切强度是众所周知的。低压(300 MPa)气体装置变形实验及数值模拟所得橄榄石晶格优选方向与上地幔地震各向异性吻合较好;(010)[100]和(0kl)[100]上的剪切导致了与海洋扩张中心剪切方向一致的地震快晶轴。最近在固体介质装置中进行的高压(2 GPa)剪切实验结果表明,在潮湿条件下变形时橄榄石织物的发育有显著不同。在高压下形成的晶格择优取向主要与位错滑动有关(010)[001]和(100)[001];据推测,在大于1gpa的压力下,这些滑移体系的临界分解剪切应力的降低是由与在橄榄石中具有高溶解度的氢点缺陷的相互作用带来的。基于这些结果,地震快速方向可以垂直于剪切方向,这对地震各向异性的地球动力学解释具有重要意义。在一些自然变形的橄榄岩中也观察到类似的结构,这些结构被认为是在潮湿条件下形成的,比如在俯冲板块释放流体的俯冲带。然而,在使用固体介质组合的高压实验中观察到的与[001]方向剪切相关的高压橄榄石织物并没有在使用熔盐组合的1.6 GPa剪切的橄榄石聚集体中重现。使用熔盐组件的优点是可以以固体介质组件无法达到的分辨率测量应力,因此可以收集准确的机械数据并将其应用于地球动力学问题。熔盐组合得到的结果与以往实验工作的另一个不同之处在于,在相同温度、应变速率和含水量下,不同围压(1.6 vs 0.3 GPa)下,熔盐组合测量的强度明显低于在气体装置中变形的橄榄石强度。为了确保在高压下测量的强度是准确的,正在改进测量熔盐组件应力的方法,并将其与使用金属的高分辨率三轴气体装置中的剪切应力测量进行比较,其强度不依赖于压力。这项研究是在Holyoke和Tullis的实验研究基础上进行的,他们使用熔盐电池进行了高压(1.6 GPa)变形实验,并获得了与低压(300 MPa)下开发的织物相似的织物。这些实验旨在弥合不同实验方法的不同结果之间的差距,提高我们对地幔变形机制的理解,表征那些有利于不同晶格优选方向的条件,并评估控制地幔地球动力学的流变学。
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 }}
Andreas Kronenberg其他文献
Incidence and resistance rates of Pseudomonas aeruginosa bloodstream infections in Switzerland: a nationwide surveillance study (2010–2022)
- DOI:
10.1007/s15010-024-02452-1 - 发表时间:
2025-01-30 - 期刊:
- 影响因子:3.600
- 作者:
Luzia Renggli;Andrea Burri;Simone Ehrhard;Michael Gasser;Andreas Kronenberg - 通讯作者:
Andreas Kronenberg
Post-pandemic consumption of outpatient antibiotics in Switzerland up to pre-pandemic levels, 2018–2023: An interrupted time series analysis
- DOI:
10.1016/j.cmicom.2024.105037 - 发表时间:
2024-12-01 - 期刊:
- 影响因子:
- 作者:
Catherine Plüss-Suard;Olivier Friedli;Anton Labutin;Michael Gasser;Yolanda Mueller;Andreas Kronenberg; Swiss Centre of Antibiotic Resistance (ANRESIS) - 通讯作者:
Swiss Centre of Antibiotic Resistance (ANRESIS)
Reducing antibiotic use in uncomplicated urinary tract infections in adult women: a systematic review and individual participant data meta-analysis
- DOI:
10.1016/j.cmi.2022.06.017 - 发表时间:
2022-12-01 - 期刊:
- 影响因子:8.500
- 作者:
Yvonne Kaußner;Christian Röver;Judith Heinz;Eva Hummers;Thomas P.A. Debray;Alastair D. Hay;Stefan Heytens;Ingvild Vik;Paul Little;Michael Moore;Beth Stuart;Florian Wagenlehner;Andreas Kronenberg;Sven Ferry;Tor Monsen;Morten Lindbæk;Tim Friede;Ildikó Gágyor - 通讯作者:
Ildikó Gágyor
Andreas Kronenberg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('Andreas Kronenberg', 18)}}的其他基金
Collaborative Research: Magnesite Deformation and Potential Roles in the Slip and Seismicity of Subduction Zones
合作研究:菱镁矿变形及其在俯冲带滑动和地震活动中的潜在作用
- 批准号:
1624249 - 财政年份:2016
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
A Reversible Rheology for Water-Weakened Quartz
水弱化石英的可逆流变学
- 批准号:
1321882 - 财政年份:2013
- 资助金额:
$ 19万 - 项目类别:
Continuing Grant
Collaborative Research: Deformation Thermometry and Water Weakening of Quartz Tectonites - Case Studies from the Himalaya and the Caledonides of NW Scotland
合作研究:石英构造岩的变形测温和水弱化——喜马拉雅山和苏格兰西北部喀里多尼亚山脉的案例研究
- 批准号:
1220138 - 财政年份:2012
- 资助金额:
$ 19万 - 项目类别:
Continuing Grant
2004 Rock Deformation Gordon Research Conferences, August 8-13,2004 at Mount Holyoke College
2004 年岩石变形戈登研究会议,2004 年 8 月 8 日至 13 日在曼荷莲学院举行
- 批准号:
0409109 - 财政年份:2004
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
Collaborative Research: Deposition of Carbon on Newly-Formed Fracture Surfaces and Its Influence on Deformation and Electrical Properties of Rocks
合作研究:碳在新形成的裂隙表面的沉积及其对岩石变形和电性能的影响
- 批准号:
0337747 - 财政年份:2003
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
2002 Rock Deformation Gordon Conference, May 2002 in Barga, Italy
2002 年岩石变形戈登会议,2002 年 5 月在意大利巴尔加举行
- 批准号:
0125826 - 财政年份:2002
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
Extension and Mechanisms of High Temperature Deformation at Oceanic Rifts
大洋裂谷高温变形的延伸及其机制
- 批准号:
9217539 - 财政年份:1992
- 资助金额:
$ 19万 - 项目类别:
Continuing Grant
Collaborative Research: Deformation of Layer Silicates
合作研究:层状硅酸盐的变形
- 批准号:
8816283 - 财政年份:1989
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
相似国自然基金
炎性反应中巨噬细胞激活诱导死亡(activation-induced cell death,AICD)的机理研究
- 批准号:30330260
- 批准年份:2003
- 资助金额:105.0 万元
- 项目类别:重点项目
相似海外基金
SARS-CoV-2-induced dead cell fragments drive viral uptake and inflammation
SARS-CoV-2 诱导的死细胞碎片驱动病毒摄取和炎症
- 批准号:
DE240101286 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Discovery Early Career Researcher Award
A novel medical device for reducing chemotherapy-induced peripheral neuropathy in the hands
一种减少化疗引起的手部周围神经病变的新型医疗设备
- 批准号:
MR/Z503800/1 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Research Grant
Modelling the impact of geomagnetically induced currents on UK railways
模拟地磁感应电流对英国铁路的影响
- 批准号:
NE/Y001176/1 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Research Grant
Understanding the mechanisms underlying noise-induced damage of hair cell ribbon synapses
了解噪声引起的毛细胞带突触损伤的机制
- 批准号:
BB/Z514743/1 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Fellowship
RII Track-4:@NASA: Wind-induced noise in the prospective seismic data measured in the Venusian surface environment
RII Track-4:@NASA:金星表面环境中测量的预期地震数据中的风致噪声
- 批准号:
2327422 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
Contorted and Strained Molecular Nanographenes: Multi-Electron Storage and Reduction-Induced Transformations
扭曲和应变的分子纳米石墨烯:多电子存储和还原诱导的转变
- 批准号:
2404031 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Continuing Grant
CAREER: Photo-induced Ultrafast Electron-nuclear Dynamics in Molecules
职业:分子中光致超快电子核动力学
- 批准号:
2340570 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Continuing Grant
Mechanisms for the propagation of R-loop induced chromosomal fragments in the germline
R环诱导染色体片段在种系中的繁殖机制
- 批准号:
2341479 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Standard Grant
The Effect and Molecular Mechanisms of HIV-induced Host RNA Modification
HIV诱导宿主RNA修饰的作用及分子机制
- 批准号:
24K18453 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Grant-in-Aid for Early-Career Scientists
Role of CD206 surface antigen on M2 macrophages in the development of insulin resistance in the diet-induced obese mice model
M2巨噬细胞上CD206表面抗原在饮食诱导肥胖小鼠模型胰岛素抵抗发展中的作用
- 批准号:
24K19282 - 财政年份:2024
- 资助金额:
$ 19万 - 项目类别:
Grant-in-Aid for Early-Career Scientists