The use of high frequency microwaves in absolute palaeomagnetic intensity experiments
The use of high frequency microwaves in absolute palaeomagnetic intensity experiments
复制标题
DOI：
10.3389/feart.2023.1188528
复制
发表时间：
2023-06
期刊：
影响因子：
--
通讯作者：
S. Lloyd;A. Biggin;M. Hill;Lennart V. de Groot;N. Suttie;Joseph Morris;H. Boehnel;J. Shaw
中科院分区：
文献类型：
--
作者：
S. Lloyd;A. Biggin;M. Hill;Lennart V. de Groot;N. Suttie;Joseph Morris;H. Boehnel;J. Shaw
利物浦大学的微波古强度系统经过30多年的发展，已经发展到目前的第三代版本；结合14ghz微波谐振腔和超导量子干涉器件的磁强计集成微波系统。微波能量的使用降低了对古磁性材料进行退磁和再磁化所需的总体温度，从而限制了磁性矿物热化学蚀变的重大问题。本文综述了微波古强度法的发展、技术细节、现代应用和研究成果。我们对2008年至2022年间发表的20项古强度研究进行了全面分析，其中使用微波系统收集的数据可以在现场水平上与各种其他方法进行比较。对微波结果的评估显示，与热数据和已知的现场数据相比，没有统计偏差。我们还介绍了一项新的对照实验的结果，该实验测试了微波在强烈叠印时精确恢复弱古强度的能力。我们的结论是，微波系统可以作为确定精确绝对古强度的主要方法，也可以作为多方法方法的一部分，并且非常适合于从考古磁样品到古代岩石的广泛材料。
The Microwave Palaeointensity System at the University of Liverpool has developed, over 30 years, into the current third generation version; a combined 14 GHz microwave resonant cavity and superconducting quantum interference device magnetometer integrated microwave system. The use of microwave energy minimises the bulk temperatures required to demagnetise and remagnetise palaeomagnetic material, thereby limiting the significant problem of thermo-chemical alteration of magnetic minerals. Here we review the microwave palaeointensity approach, including its development, technical details, modern usage and results. We have carried out a comprehensive analysis of 20 palaeointensity studies, published between 2008 and 2022, where data collected using the microwave system may be compared with various other methods at the site level. An assessment of microwave results revealed no statistical bias compared to thermal, and known field data. We also present results from a new controlled experiment which tests the ability of the microwave to accurately recover weak, ancient palaeointensities when strongly overprinted. We conclude that the microwave system can be used for the primary method of determining accurate absolute palaeointensities or as part of a multi-method approach, and is well suited to a wide range of material from archaeomagnetic samples to ancient rocks.