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首页> 外文期刊>Geophysical Research Letters >Lodestone: natures only permanent magnet-what it is and how it gets charged
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Lodestone: natures only permanent magnet-what it is and how it gets charged

机译：Lodestone：自然界只有永久磁铁-它是什么以及如何充电

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Magnetite and Titanomagnetite exhibit magnetic properties which are attributable to the micro-structures developed during oxidation and exsolution: All magnetite iron ores which are lodestones contain maghemite. These lodestones have Hc between 10 and 30 mT, SIRM between 8 and 18 Am~2kg~1, and R_I between 0.10 and 0.26. Magnetite, titanomagnetite and metals have REM values (ratio of NRM to SIRM) < 0.05. Samples (called fulgarites) obtained from the Smithsonian Institution have REM values ranging from 0.45 to 0.92. The REM value serves as a witness parameter to the magnetic fields associated with the lightning bolt. If a high REM value (say very much greater than 0.1) can be verified as not to be due to contamination by man and does not contain MD hematite then the rock has LRM (lightning remanent magnetization). The magnetic field associated with lightning can be revealed from an isothermal remanent acquisition (RA) curve.
机译：磁铁矿和钛磁铁矿显示出磁性，这归因于在氧化和溶出过程中形成的微观结构：所有磁铁矿的铁矿石都为磁铁矿，都含有磁赤铁矿。这些菱形岩的Hc在10到30 mT之间，SIRM在8到18 Am〜2kg-1之间，R_I在0.10到0.26之间。磁铁矿，钛磁铁矿和金属的REM值（NRM与SIRM之比）<0.05。从史密森学会获得的样品（称为人造石）的REM值为0.45至0.92。 REM值用作与雷电相关的磁场的见证参数。如果可以证明高REM值（例如远大于0.1）不是由人为污染引起的，并且不含MD赤铁矿，则该岩石具有LRM（雷电剩磁）。与闪电相关的磁场可以从等温剩余捕获（RA）曲线中揭示出来。

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