Iron ore to lodestone: With lightning assist

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10473522" target="_blank" >RIV/00216208:11310/23:10473522 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ix42fyZf1N" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ix42fyZf1N</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jappgeo.2023.105225" target="_blank" >10.1016/j.jappgeo.2023.105225</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Iron ore to lodestone: With lightning assist

Popis výsledku v původním jazyce

A lodestone is a piece of magnetite or titanomagnetite iron ore having an extremely intense remanent magnetization; it is nature&apos;s only permanent magnet. This magnetization intensity is larger than could be acquired in any iron ore by any known natural mechanism through exposure to just the Earth&apos;s magnetic field. This is revealed by the large ratio (REM) of the measured (NRM) - natural remanence, to the (SIRM) - saturation remanence. We describe new details of the mechanism by which part of an iron ore body becomes a lodestone: Exposure to lightning bolt related electric discharge&apos;s magnetic fields is required. While the lightning bolt related magnetic fields are necessary, they are not sufficient for creation of a lodestone. We show that the iron ore must be previously magnetically &quot;hardened&quot; into what we term a &quot;latent lodestone iron ore&quot; condition before the transformation to lodestone can be achieved. A magnetic hardness continuum (characterized with magnetic hysteresis loop parameters) for a range of magnetite and titanomagnetite iron ores demonstrates how the hardening is created by alteration; in magnetite through oxidation scenarios and in titanomagnetite by solid state exsolution and oxidation. Large REM (evidence of lightning), the *Polarity signature (which we identify with iron powder patterns) reflecting the large REM, and the location on the magnetic hardness continuum (latent lodestone state resulting in largest possible magnetization), provides important details to the lodestone story.

Název v anglickém jazyce

Iron ore to lodestone: With lightning assist

Popis výsledku anglicky

A lodestone is a piece of magnetite or titanomagnetite iron ore having an extremely intense remanent magnetization; it is nature&apos;s only permanent magnet. This magnetization intensity is larger than could be acquired in any iron ore by any known natural mechanism through exposure to just the Earth&apos;s magnetic field. This is revealed by the large ratio (REM) of the measured (NRM) - natural remanence, to the (SIRM) - saturation remanence. We describe new details of the mechanism by which part of an iron ore body becomes a lodestone: Exposure to lightning bolt related electric discharge&apos;s magnetic fields is required. While the lightning bolt related magnetic fields are necessary, they are not sufficient for creation of a lodestone. We show that the iron ore must be previously magnetically &quot;hardened&quot; into what we term a &quot;latent lodestone iron ore&quot; condition before the transformation to lodestone can be achieved. A magnetic hardness continuum (characterized with magnetic hysteresis loop parameters) for a range of magnetite and titanomagnetite iron ores demonstrates how the hardening is created by alteration; in magnetite through oxidation scenarios and in titanomagnetite by solid state exsolution and oxidation. Large REM (evidence of lightning), the *Polarity signature (which we identify with iron powder patterns) reflecting the large REM, and the location on the magnetic hardness continuum (latent lodestone state resulting in largest possible magnetization), provides important details to the lodestone story.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA23-06075S" target="_blank" >GA23-06075S: Environmentální změny způsobené extraterestrickými impakty a vulkanismem: Doklady v jezerních sedimentech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Applied Geophysics

ISSN

0926-9851

e-ISSN

1879-1859

Svazek periodika

219

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

105225

Kód UT WoS článku

001110938500001

EID výsledku v databázi Scopus

2-s2.0-85175840456