V. P. Shcherbakov, N. K. Sycheva, N. A. Aphinogenova, M. A. Smirnov, G. V. Zhidkov
{"title":"The Pseudo-Thellier Method for Single-Domain Noninteracting Particles: Theory and Experiment","authors":"V. P. Shcherbakov, N. K. Sycheva, N. A. Aphinogenova, M. A. Smirnov, G. V. Zhidkov","doi":"10.1134/S1069351325700120","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—The pseudo-Thellier method is numerically simulated based on a rigorous solution of kinetic equations for uniaxial randomly oriented noninteracting single-domain grains. Laboratory experiments have been performed to determine the relative paleointensity <i>B</i><sub>anc</sub> with thermoremanent magnetization (TRM) created in samples of igneous rocks in random fields <i>B</i><sub>rand</sub>; the domain structure of grains of these samples varies from single- to multi-domain. Both predicted and measured pseudo-Arai plots can be divided into two quasi linear segments, one in the relatively low-coercivity region <i>B</i><sub>c</sub> < 40–50 mT and the other at higher alternating field (AF) amplitudes. The determinations of relative paleointensity <i>B</i><sub>anc</sub> on TRM-bearing igneous rocks, estimated from low-coercivity segments of pseudo-Arai plots, give fairly good results with a linear correlation coefficient <i>R</i> = 0.8 between the true field <i>B</i><sub>rand</sub> and <i>B</i><sub>anc</sub> determined by the pseudo-Thellier method. It is shown that when thermal fluctuations for relatively small and magnetically soft particles (which corresponds to low blocking temperatures) are taken into account, a significant difference is observed between the coercive force <i>B</i><sub>cr</sub> of a grain and the actual field of its magnetization (demagnetization). The main conclusion of the study is that applying the pseudo-Thellier method to igneous rocks is promising. Further development of the methodological and practical aspects of this approach could yield interesting results, particularly when analyzing samples that are unstable to changes in magnetic minerals during the classical Thellier procedure.</p>","PeriodicalId":602,"journal":{"name":"Izvestiya, Physics of the Solid Earth","volume":"61 1","pages":"1 - 12"},"PeriodicalIF":1.0000,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Izvestiya, Physics of the Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S1069351325700120","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
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Abstract—The pseudo-Thellier method is numerically simulated based on a rigorous solution of kinetic equations for uniaxial randomly oriented noninteracting single-domain grains. Laboratory experiments have been performed to determine the relative paleointensity Banc with thermoremanent magnetization (TRM) created in samples of igneous rocks in random fields Brand; the domain structure of grains of these samples varies from single- to multi-domain. Both predicted and measured pseudo-Arai plots can be divided into two quasi linear segments, one in the relatively low-coercivity region Bc < 40–50 mT and the other at higher alternating field (AF) amplitudes. The determinations of relative paleointensity Banc on TRM-bearing igneous rocks, estimated from low-coercivity segments of pseudo-Arai plots, give fairly good results with a linear correlation coefficient R = 0.8 between the true field Brand and Banc determined by the pseudo-Thellier method. It is shown that when thermal fluctuations for relatively small and magnetically soft particles (which corresponds to low blocking temperatures) are taken into account, a significant difference is observed between the coercive force Bcr of a grain and the actual field of its magnetization (demagnetization). The main conclusion of the study is that applying the pseudo-Thellier method to igneous rocks is promising. Further development of the methodological and practical aspects of this approach could yield interesting results, particularly when analyzing samples that are unstable to changes in magnetic minerals during the classical Thellier procedure.
期刊介绍：
Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.
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