Collaborative Research: Time- and Temperature-dependent Cation Ordering in Natural Titanomagnetites with Applications to Paleomagnetism and Geospeedometry

合作研究:天然钛磁铁矿中时间和温度依赖性阳离子排序及其在古地磁学和地速测量中的应用

基本信息

  • 批准号:
    1315845
  • 负责人:
  • 金额:
    $ 5.26万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2013
  • 资助国家:
    美国
  • 起止时间:
    2013-06-01 至 2018-05-31
  • 项目状态:
    已结题

项目摘要

The main goals of this proposal are (1) to understand the time- and temperature-dependent cation ordering process recently documented in natural titanomagnetites; (2) to quantify the kinetics of the process and to develop a titanomagnetite-based geospeedometer; and (3) to understand and model the effects of cation ordering on magnetic properties and on the acquisition, retention, and demagnetization of thermoremanent magnetization (TRM), partial thermoremanence (pTRM) and thermoviscous remanence (TVRM). Newly acquired data demonstrate that natural titanomagnetites of common composition undergo temperature-dependent cation ordering at moderate temperatures (300-500°C) and over timescales of hours to months. As a result, the magnetic Curie temperature (Tc) is a strong function of prior thermal history, changing by up to 150°C with no attendant chemical changes. As (re-)ordering may take place at T Tc, this clearly has profound implications for our understanding of TRM acquisition and stability, and may lead to increased uncertainty in absolute paleointensity estimates, as well as in paleomagnetic paleothermometry. We propose to determine the nature of the cation ordering process in complex titanomagnetites via synthesis of samples of controlled composition, and characterization via powder X-ray diffraction, Mössbauer spectroscopy, and X-ray magnetic circular dichroism (XMCD). The degree of order will then be directly linked to Curie temperature and other magnetic properties. Isothermal annealing experiments will allow us to constrain the kinetics of the ordering process, and TC can then be calculated as a function of order for a given cooling path. This titanomagnetite geospeedometer will be tested against natural samples from locations with known emplacement temperatures and cooling rates. Finally, we will determine the effects of time- and temperature-dependent cation reordering on remanence acquisition and stability, as well as on paleointensity estimates, via a series of experiments with controlled thermal histories. Laboratory data and models will be compared with observations on natural samples where cation ordering is expected to vary systematically with known cooling rates. Magnetization acquired by the iron-titanium oxide mineral titanomagnetite (frequently found in volcanic rocks) provides a vital source of information about geomagnetic field history and tectonic plate motions. Yet, there are fundamental aspects of titanomagnetite mineral magnetism that remain inadequately understood, particularly concerning the arrangement of metal cations (Fe2+, Fe3+, Ti4+, Mg2+, etc.) in the oxide crystal structure, how the cation arrangement may change with temperature, and resulting changes in important magnetic properties. It has been recently observed that natural titanomagnetites of common composition undergo temperature-dependent cation reordering at moderate temperatures (300-500°C) and over timescales of hours to months. This cation reordering affects the fundamental magnetic properties of the titanomagnetites, and influences the mechanisms through which they record the ambient magnetic field during cooling, thus introducing uncertainty into estimates of geomagnetic field intensity derived from titanomagnetite-bearing rocks. The proposed work aims to understand this cation ordering process and the resulting effects on magnetization and magnetic properties. Further, the proposed work will provide a greater understanding of uncertainty in commonly-used paleomagnetic estimates of temperatures associated with past geologic phenomena such as volcanic events or burial-related heating. The results may be of wide interest in constraining emplacement temperatures and cooling rates in pyroclastic flows (PF) -- hot mixtures of volcanic gas, ash and rock fragments. PFs constitute one of the most significant volcanic hazards, and slow cooling means the hazard may persist long after initial emplacement. Very few direct temperature measurements of PFs have been made, and new methods for quantification of cooling rates and emplacement temperatures will help in hazard planning.
本项目的主要目标是:(1)了解天然钛磁铁矿中最近记录的依赖于时间和温度的阳离子有序化过程;(2)量化该过程的动力学并开发基于钛磁铁矿的地质速度计;以及(3)理解和模拟阳离子有序化对磁性以及对热还原磁化(TRM)的获得、保持和退磁的影响,部分热剩磁(pTRM)和热粘剩磁(TVRM)。 新获得的数据表明,常见成分的天然钛磁铁矿在中等温度(300-500°C)下经历了依赖于温度的阳离子有序化,时间跨度为数小时至数月。 因此,磁居里温度(Tc)是先前热历史的强函数,变化高达150°C而没有伴随的化学变化。 由于(重新)排序可能发生在T Tc,这显然对我们理解TRM采集和稳定性有深远的影响,并可能导致绝对古强度估计的不确定性增加,以及在古地磁古测温。 我们建议通过合成控制组合物的样品,并通过粉末X射线衍射,穆斯堡尔谱和X射线磁性圆二色性(XMCD)表征,以确定复杂的钛磁铁矿中的阳离子有序过程的性质。有序度将直接与居里温度和其他磁性有关。 等温退火实验将使我们能够约束动力学的排序过程中,TC可以计算为一个给定的冷却path. This的顺序的函数titanomagnetite geospeedometer将测试对自然样品的位置与已知的侵位温度和冷却速率。 最后,我们将通过一系列具有受控热历史的实验,确定与时间和温度相关的阳离子重排对剩磁获取和稳定性以及古强度估计的影响。 实验室数据和模型将与自然样品的观察结果进行比较,其中阳离子排序预计会随着已知的冷却速率而系统地变化。由铁-钛氧化物矿物钛磁铁矿(经常在火山岩中发现)获得的磁化强度提供了有关地磁场历史和构造板块运动的重要信息来源。然而,钛磁铁矿矿物磁性的基本方面仍然没有得到充分的理解,特别是关于金属阳离子(Fe 2+、Fe 3+、Ti 4+、Mg 2+等)的排列。在氧化物的晶体结构中,阳离子的排列方式可能会随着温度的变化而发生变化,并由此引起重要的磁性变化。最近已经观察到,普通组成的天然钛磁铁矿在中等温度(300-500°C)下和在数小时至数月的时间尺度上经历依赖于温度的阳离子重排。这种阳离子重新排序影响了钛磁铁矿的基本磁性,并影响了它们在冷却过程中记录环境磁场的机制,从而给来自含钛磁铁矿岩石的地磁场强度估计带来了不确定性。 拟议的工作旨在了解这种阳离子有序化过程以及由此产生的对磁化和磁性的影响。 此外,拟议的工作将提供一个更好的理解,在常用的古地磁估计与过去的地质现象,如火山事件或埋葬相关的加热温度的不确定性。 这些结果可能对限制火山碎屑流(PF)-火山气体、火山灰和岩石碎片的热混合物-中的就位温度和冷却速率具有广泛的意义。 PFs构成了最重要的火山灾害之一,缓慢冷却意味着灾害可能在最初的就位后持续很长时间。 对爆炸点进行的直接温度测量很少,量化冷却速率和安置温度的新方法将有助于灾害规划。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Assessing New and Old Methods in Paleomagnetic Paleothermometry: A Test Case at Mt. St. Helens, USA
评估古地磁古体温测量的新旧方法:美国圣海伦斯山的测试案例
  • DOI:
    10.1029/2018gc007435
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Bowles, Julie A.;Gerzich, Devin M.;Jackson, Mike J.
  • 通讯作者:
    Jackson, Mike J.
Malleable Curie Temperatures of Natural Titanomagnetites: Occurrences, Modes, and Mechanisms
天然钛磁铁矿的可延展居里温度:发生、模式和机制
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Michael Jackson其他文献

THE PUBLIC INTEREST, PUBLIC SERVICE AND DEMOCRACY
Use of a pH-stat strategy during retrograde cerebral perfusion improves cerebral perfusion and tissue oxygenation.
在逆行脑灌注期间使用 pH 稳定策略可改善脑灌注和组织氧合。
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    4.6
  • 作者:
    Jian;Zhijun Li;Yanmin Yang;Luojia Yang;A. Turner;Michael Jackson;R. Deslauriers
  • 通讯作者:
    R. Deslauriers
Topsy-turvy requirements
  • DOI:
    10.1007/s00766-013-0179-2
  • 发表时间:
    2013-08-18
  • 期刊:
  • 影响因子:
    3.300
  • 作者:
    Michael Jackson
  • 通讯作者:
    Michael Jackson
Towards a formalism-based toolkit for automotive applications
面向汽车应用的基于形式主义的工具包
Is Maintenance of Cerebral Hypothermia the Principal Mechanism by which Retrograde Cerebral Perfusion Provides Better Brain Protection than Hypothermic Circulatory Arrest?
维持脑低温是逆行脑灌注比低温停循环提供更好脑保护的主要机制吗?
  • DOI:
    10.1111/j.0886-0440.2004.04006.x
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    1.6
  • 作者:
    Zhijun Li;Luojia Yang;R. Summers;Michael Jackson;R. Deslauriers;Jian
  • 通讯作者:
    Jian

Michael Jackson的其他文献

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{{ truncateString('Michael Jackson', 18)}}的其他基金

REU SITE: A Pilot Distributed REU Site Focused on Serving Physics and Astronomy Students from Comprehensive and Community Colleges
REU SITE:分布式 REU 试点站点,专注于为综合大学和社区学院的物理和天文学学生提供服务
  • 批准号:
    1358879
  • 财政年份:
    2014
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Continuing Grant
Geospatial Resource for Agricultural Species and Pests with integrated workflow modelling to support Global Food Security (GRASP-GFS): a prototype
农业物种和害虫地理空间资源与集成工作流程建模以支持全球粮食安全 (GRASP-GFS):原型
  • 批准号:
    BB/K004034/1
  • 财政年份:
    2013
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Research Grant
RUI: High Resolution Spectroscopy of Stable Molecular Species and Free Radicals
RUI:稳定分子种类和自由基的高分辨率光谱
  • 批准号:
    0910935
  • 财政年份:
    2009
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Standard Grant
D-SCENT: Raising challenges to deception attempts using data scent trails
D-SCENT:利用数据气味踪迹对欺骗尝试提出挑战
  • 批准号:
    EP/F008600/1
  • 财政年份:
    2007
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Research Grant
RUI: High Resolution Spectroscopy of Stable Molecular Species and Free Radicals
RUI:稳定分子种类和自由基的高分辨率光谱
  • 批准号:
    0802607
  • 财政年份:
    2007
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Standard Grant
RUI: High Resolution Spectroscopy of Stable Molecular Species and Free Radicals
RUI:稳定分子种类和自由基的高分辨率光谱
  • 批准号:
    0604715
  • 财政年份:
    2006
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Standard Grant
Collaborative Research: EarthScope-Acquisition, Construction, Facility Management, Operations and Maintenance/Plate Boundary Observatory (PBO)
合作研究:EarthScope-采集、建设、设施管理、运营和维护/板块边界观测站 (PBO)
  • 批准号:
    0350028
  • 财政年份:
    2003
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Cooperative Agreement
U.S.-U.K. Cooperative Research: High Resolution Spectroscopy of Free Radicals Using Laser Magnetic Resonance
美国-英国合作研究:使用激光磁共振进行自由基高分辨率光谱分析
  • 批准号:
    0200746
  • 财政年份:
    2002
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Standard Grant
MRI: Acquisition of a Three-Laser Heterodyne Frequency Measurement System
MRI:获取三激光外差频率测量系统
  • 批准号:
    0114450
  • 财政年份:
    2001
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Standard Grant
High Resolution Molecular Spectroscopy Using Direct Discharge and Optically Pumped Molecular Lasers in the Far-Infrared
使用远红外直接放电和光泵浦分子激光器的高分辨率分子光谱
  • 批准号:
    0078812
  • 财政年份:
    2000
  • 资助金额:
    $ 5.26万
  • 项目类别:
    Continuing Grant

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