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Thermomagnetic recording stability of taenite-containing meteoritic cloudy zones
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  • José Augusto Devienne,
  • Thomas Andreas Berndt,
  • Wyn Williams,
  • Lesleis Nagy
José Augusto Devienne
Peking University

Corresponding Author:devienne@stu.pku.edu.cn

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Thomas Andreas Berndt
Peking University
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Wyn Williams
University of Edinburgh
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Lesleis Nagy
University of Liverpool
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The cloudy zone (CZ), a nm-sized intergrowth of taenite or tetrataenite crystals (or islands), is the most promising phase to preserve palaeomagnetic records in (stony-)iron meteorites. While slowly-cooled meteorites form tetrataenite – an extremely good recorder – fast-cooled meteorites contain fine-grained taenite islands, which were considered unsuitable for palaeomagnetic studies. In this work, however, we show that nm-sized taenite grains are stable over billion-year timescales, indicating that taenite-bearing meteorites are reliable sources of paleomagnetic information. Additionally, we find a range of sizes for which taenite forms stable single-domain structures. Single-domain states might be preserved even through subsequent tetrataenite ordering, implying that tetrataenite might carry magnetization state inherited from its precursor taenite. This remanent magnetization can be up to 10\textsuperscript{5} years older than that of larger tetrataenite islands in the same meteorite, which would have been reset upon ordering. This allow studding to two distinct events of planetesimal formation from a single sample.
31 Jan 2023Submitted to ESS Open Archive
01 Feb 2023Published in ESS Open Archive