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Recent advances in anisotropy of magnetic remanence: New software and practical examples
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SYSNO ASEP 0379701 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Recent advances in anisotropy of magnetic remanence: New software and practical examples Tvůrce(i) Chadima, Martin (GLU-S) RID, SAI Zdroj.dok. Contributions to Geophysics & Geodesy - ISSN 1335-2806
-, special issue (2012), s. 59-60Poč.str. 2 s. Forma vydání WWW - WWW Akce Castle meeting New Trends in Geomagnetism : Paleo, rock and environmental magnetism/13./ Datum konání 17.06.2012-23.06.2012 Místo konání Zvolen Země SK - Slovensko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. SK - Slovensko Klíč. slova magnetic susceptibility ; anisotropy ; anisotropy of magnetic susceptibility Vědní obor RIV DE - Zemský magnetismus, geodézie, geografie Institucionální podpora GLU-S - RVO:67985831 Anotace A very effective means of rock fabric analysis is based on the anisotropic magnetic properties, most commonly magnetic susceptibility. While anisotropy of magnetic susceptibility (AMS) is very fast and precise, it may, in certain cases, face some limitations because it reflects the sum of preferred orientation of all rock-constituent minerals. This limitation can be overcome using methods based on the magnetic remanence (Jackson 1991, Hirt 2007). The main applications of anisotropy of magnetic remanence (AMR) are i) distinguishing between the whole-rock magnetic fabric and magnetic fabric carried solely by ferromagnetic (s.l.) minerals (e.g. Hrouda 2002), ii) identifying inverse AMS fabric carried by single-domain magnetite grains (e.g. Chadima 2008); iii) assessment how the preferred orientation of ferromagnetic minerals affects the characteristic remanent magnetization of a rock (e.g. Bilardello 2009). All AMR techniques require an artificial magnetization – the most common being anhysteretic and isothermal remanent magnetizations – to be imparted along a set of independent directions. Various magnetization schemes have been proposed. We present a new hardware/software (ARem2W program) solution which includes 3-, 6-, 12-, and 15-direction designs. The user is guided through the measurement design and as soon as all necessary directions are measured, AMR tensor is calculated and expressed as the principal AMR directions (with respective confidence ellipses) together with various quantitative AMR parameters. The AMR data can be treated the same way as the AMS data and processed using, e.g., Anisoft software by Agico. The real examples demonstrating how the AMR can be used in solving various problems in magnetic fabric interpretation are discussed. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2013
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