VIRGIL: The VIRtual paleomaGnetIc Laboratory
VIRGIL:虚拟古瘤基因实验室
基本信息
- 批准号:NE/V014722/1
- 负责人:
- 金额:$ 75.34万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Fellowship
- 财政年份:2022
- 资助国家:英国
- 起止时间:2022 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Earth's magnetic field has been part of our planet from early on its formation, but the processes by which it occurs are still not well understood. The first theory of magnetism by William Gilbert proposed one of the first theories of geomagnetism in his treatise "De Magnete, Magneticisque Corporibus, et de Magno Magnete Tellure (On the Magnet and Magnetic Bodies, and on That Great Magnet the Earth)" in 1600. By observing lodestone (naturally occurring magnetite deposits), Gilbert proposed that the Earth was a giant dipolar magnet, but the theory didn't account for the many small-scale variations in Earth's field over the globe such as the south Atlantic magnetic anomaly. Modern theories of geomagnetism propose that the field is formed by a vast ocean of liquid iron swirling around a solid iron core - and evidence of this exists in modern day observations the fine structure of the field. But what about the field in the past? Fortunately, rocks containing small specs of magnetic materials can record and retain Earth's ancient field over millennia, in the same way that magnetic tape can be used to record information. Unfortunately, like magnetic tape left in the sun too long, natural rocks are subject to many external factors that distort the ancient signal that they record. It is the task of palaeo- and rock magnetism to devise experiments to "clean" the signal and recover the ancient field. But how do we know that the field that we recover is the true ancient recording? This is done by understanding precisely how each small grain behaves in response to heating, changing external field and other processes (such as chemical alteration).Knowledge of Earth's field tells not just the story of the physical processes of how our planet was formed - it is also the story of human culture. It constrains dates of archaeological sites and gives us an understanding of how those sites were used, be it for cooking or the forging of metals. It tells us of natural disasters such as wildfires and the displacement human populations. The ancient field has always been with us and or planet, but the physical theories that underpin experiments to recover this vital information is flawed.The current theory of magnetic recording in natural materials was devised by Néel and Stoner & Wohlfarth and is now 70 years old. It accounts for only a tiny fraction of the grain sizes and geometries of magnetic minerals found in rocks; but the experimental protocols and analytical tools to recover the palaeomagnetic signal are still being built on this model. In this proposal I will overhaul magnetic recording theory by using micromagnetic modelling, big-data and machine learning methods to build a complete simulation of the recording process in rocks from the ground up. This will enable me to revisit the palaeomagnetic record and answer the question: "is this a good recorder"? Such an evaluation of the existing palaeomagnetic record is critical since it constrains geodynamo models and allows us to peer into the deep past of our planet. Not only that, but it will also help underpin the models that will allow us to investigate the future of the geodynamo.
地球的磁场从形成之初就已经成为我们星球的一部分,但它发生的过程仍然没有得到很好的理解。威廉·吉尔伯特在1600年的论文《论磁铁和磁性物体,以及地球的大磁铁》中提出了地磁学的第一个理论。通过观察天然磁石(自然形成的磁铁矿),吉尔伯特提出地球是一个巨大的偶极磁铁,但该理论没有解释地球磁场在地球仪上的许多小尺度变化,如南大西洋的磁异常。现代地磁理论认为,磁场是由一个巨大的液态铁海洋围绕着一个固体铁芯旋转而形成的,现代观测中存在着磁场精细结构的证据。但过去的领域呢?幸运的是,含有少量磁性材料的岩石可以记录并保留地球数千年的古老磁场,就像磁带可以用来记录信息一样。不幸的是,就像磁带在阳光下放置太久一样,天然岩石会受到许多外部因素的影响,这些因素会扭曲它们记录的古老信号。古磁学和岩石磁学的任务是设计实验来“清除”信号并恢复古代磁场。但我们怎么知道我们恢复的磁场是真正的古代记录呢?这是通过精确地了解每一个小颗粒如何对加热、变化的外部场和其他过程(如化学变化)做出反应来实现的。对地球场的了解不仅讲述了我们星球如何形成的物理过程的故事,也讲述了人类文化的故事。它限制了考古遗址的日期,并让我们了解这些遗址是如何被使用的,无论是烹饪还是锻造金属。它告诉我们自然灾害,如野火和流离失所的人口。这个古老的磁场一直伴随着我们和/或地球,但支撑恢复这一重要信息的实验的物理理论是有缺陷的。目前的天然材料磁记录理论是由Néel和Stoner & Wohlfarth设计的,现在已经有70年的历史了。它只占岩石中磁性矿物的颗粒尺寸和几何形状的一小部分;但恢复古地磁信号的实验方案和分析工具仍在建立在这个模型上。在这个提案中,我将通过使用微磁建模,大数据和机器学习方法来彻底改革磁记录理论,从根本上建立岩石记录过程的完整模拟。这将使我能够重新审视古地磁记录,并回答这个问题:“这是一个好的记录”?对现有的古地磁记录进行这样的评估是至关重要的,因为它限制了地球发电机模型,并使我们能够窥视地球的过去。不仅如此,它还将有助于支撑模型,使我们能够研究地球发电机的未来。
项目成果
期刊论文数量(9)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Thermomagnetic recording stability of taenite-containing meteoritic cloudy zones
含镍纹石陨石云带的热磁记录稳定性
- DOI:10.22541/essoar.167525233.31180340/v1
- 发表时间:2023
- 期刊:
- 影响因子:0
- 作者:Devienne J
- 通讯作者:Devienne J
Micromagnetic determination of the FORC response of paleomagnetically significant magnetite assemblages
具有古地磁意义的磁铁矿组合的 FORC 响应的微磁测定
- DOI:10.22541/essoar.170533987.78411398/v1
- 发表时间:2024
- 期刊:
- 影响因子:0
- 作者:Nagy L
- 通讯作者:Nagy L
Magnetic Domain States and Critical Sizes in the Titanomagnetite Series
钛磁铁矿系列的磁畴状态和临界尺寸
- DOI:10.22541/essoar.170688764.46924474/v1
- 发表时间:2024
- 期刊:
- 影响因子:0
- 作者:Cych B
- 通讯作者:Cych B
Magnetic Hysteresis Properties of Magnetite: Trends with Particle Size and Shape
磁铁矿的磁滞特性:随颗粒尺寸和形状的变化趋势
- DOI:10.22541/essoar.170516030.08186908/v1
- 发表时间:2024
- 期刊:
- 影响因子:0
- 作者:Paterson G
- 通讯作者:Paterson G
Micromagnetic determination of the FORC response of paleomagnetically significant magnetite assemblages - supplementary data
具有古地磁意义的磁铁矿组合的 FORC 响应的微磁测定 - 补充数据
- DOI:10.5281/zenodo.10529804
- 发表时间:2024
- 期刊:
- 影响因子:0
- 作者:Nagy L
- 通讯作者:Nagy L
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Lesleis Nagy其他文献
Micromagnetic Modeling of a Magnetically Unstable Zone and Its Geological Significances
磁不稳定区的微磁模拟及其地质意义
- DOI:
10.1029/2022jb024876 - 发表时间:
2022-09 - 期刊:
- 影响因子:0
- 作者:
Yuqin Wang;Kunpeng Ge;Wyn Williams;Hui Zhou;Huapei Wang;Lesleis Nagy;Lisa Tauxe;Jiang Wang;Shengbo Liu;Yang Liu - 通讯作者:
Yang Liu
Lesleis Nagy的其他文献
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