{
  "abstract": "We present a multiscale, non-destructive analysis of non-poikilitic olivine in the shergottite NWA 7721 using dark-field X-ray microscopy, electron backscatter diffraction, and 2D micro-X-ray diffraction. We report striking bimodal microstructures within a single olivine crystal: fine Type 1 subgrains (around 5 μm), weakly oriented, and nearly strain-free; coarser Type 2 subgrains (>15 μm), aligned, and strongly strained. Layered DFXM data reveal slip-band features in Type 2 that are absent in Type 1. This bimodal microstructure, not observed in other Martian meteorites, including the paired NWA 1950 and ALH A77005, points to a heterogeneous response to impact at the crystallographic scale. We interpret Type 1 as shock-assisted recrystallites and Type 2 as relic partitioned from a highly deformed parental grain with a pre-existing fabric. The subsequent shock wave imposed a rapid load-release cycle that generated heterogeneous deformation within the crystal. Highly strained regions underwent recrystallization to form Type 1 subgrains, whereas less-strained domains retained deformation structures as Type 2. Grain-growth constraints limit the post-shock heating to ≈2.3 s, consistent with rapid quenching. Together, these observations illustrate a dynamic Martian crustal activity in the Late Amazonian and demonstrate DFXM, combined with EBSD and micro-XRD, as a promising tool for resolving complex fabrics in 3D.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2511.08316",
  "author_total": 8,
  "authors": [
    {
      "name": "Yaozhu Li"
    },
    {
      "name": "Szilvia Kalácska"
    },
    {
      "name": "Phil J. A. Mccausland"
    },
    {
      "name": "Roberta L. Flemming"
    },
    {
      "name": "Callum J. Hetherington"
    },
    {
      "name": "Bo Zhao"
    },
    {
      "name": "Can Yıldırım"
    },
    {
      "name": "Carsten Detlefs"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/248qg8h1067e3.bib",
  "cited_by": 0,
  "doi": "10.1038/s44453-026-00048-7",
  "fulltext_url": null,
  "id": "248qg8h1067e3",
  "issns": [
    "3059-3700"
  ],
  "landing_url": "https://hal-emse.ccsd.cnrs.fr/emse-05767027v1",
  "language": "en",
  "licence": "CC-BY-NC-ND",
  "licence_label": "CC BY-NC-ND",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "0.sdu"
    ],
    [
      "hal",
      "0.spi"
    ],
    [
      "hal",
      "1.phys.meca"
    ],
    [
      "hal",
      "1.spi.mat"
    ],
    [
      "hal",
      "2.phys.meca.mema"
    ],
    [
      "openalex",
      "3103|Planetary Science and Exploration"
    ]
  ],
  "openalex": "W4416219001",
  "pdf_url": "https://www.nature.com/articles/s44453-026-00048-7.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/248qg8h1067e3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:42Z",
      "native_id": "emse-05767027",
      "source": "hal",
      "url": "https://hal-emse.ccsd.cnrs.fr/emse-05767027v1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Planetary Science and Exploration",
      "subfield": "planetary"
    }
  ],
  "title": "Remanent crustal strain on Mars in non-poikilitic olivine of NWA 7721",
  "title_text": "Remanent crustal strain on Mars in non-poikilitic olivine of NWA 7721",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:42Z",
  "url": "https://research.draconitic.com/paper/248qg8h1067e3",
  "venue": "npj Space Exploration",
  "versions": []
}