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<p>Magnetite is a principal paleomagnetic recorder on Earth, but lunar magnetism is thought to be dominated by metallic iron and Fe-Ni alloys, with magnetite rare and typically sub-micrometer within troilite. We identify nanometer- to micrometer-scale magnetite in pentlandite-troilite assemblages from a Chang’e-5 regolith breccia. Magnetite occurs at and within pentlandite, locally enclosing pentlandite nanoinclusions, implying a formation pathway distinct from troilite-hosted occurrences. Textures and compositions indicate sequential crystallization from an impact-generated Fe-Ni-S-O melt: rapid pentlandite growth along troilite margins followed by magnetite nucleation at sulfide-silicate interfaces. The lunar low oxygen fugacity stabilizes Fe<sup>2+</sup>-enriched magnetite, unlike terrestrial analogues. High crystallinity and single-domain to single-vortex states indicate strong remanence stability, making these grains reliable recorders of the contemporaneous lunar magnetic fields. These results broaden the inventory of lunar magnetic carriers, demonstrate impact-driven magnetite formation under lunar redox conditions, and motivate use of magnetite to refine the Moon’s magnetic history.</p>

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Impact-generated magnetite in Chang’e-5 soil as a potential recorder of lunar magnetism

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月10日

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  • Jinhua Li,
  • Chaoqun Zhang,
  • Chen Li,
  • Yi Chen,
  • Qinghua Zhang,
  • Qianqian Lan,
  • Yuqin Wang,
  • Weiwei Wu,
  • Jian Wang,
  • Zheng Gong,
  • Xu Tang,
  • Xuechao Sha,
  • Lixin Gu,
  • Shiqi Cheng,
  • Peiyu Liu,
  • Jiawei Liu,
  • Qiuli Li,
  • Lin Gu,
  • Gang Li,
  • Yang Li,
  • Rafal E. Dunin-Borkowski,
  • Andrew P. Roberts,
  • Yongxin Pan

摘要

Magnetite is a principal paleomagnetic recorder on Earth, but lunar magnetism is thought to be dominated by metallic iron and Fe-Ni alloys, with magnetite rare and typically sub-micrometer within troilite. We identify nanometer- to micrometer-scale magnetite in pentlandite-troilite assemblages from a Chang’e-5 regolith breccia. Magnetite occurs at and within pentlandite, locally enclosing pentlandite nanoinclusions, implying a formation pathway distinct from troilite-hosted occurrences. Textures and compositions indicate sequential crystallization from an impact-generated Fe-Ni-S-O melt: rapid pentlandite growth along troilite margins followed by magnetite nucleation at sulfide-silicate interfaces. The lunar low oxygen fugacity stabilizes Fe2+-enriched magnetite, unlike terrestrial analogues. High crystallinity and single-domain to single-vortex states indicate strong remanence stability, making these grains reliable recorders of the contemporaneous lunar magnetic fields. These results broaden the inventory of lunar magnetic carriers, demonstrate impact-driven magnetite formation under lunar redox conditions, and motivate use of magnetite to refine the Moon’s magnetic history.