{"id":42025,"date":"2026-07-03T12:26:34","date_gmt":"2026-07-03T10:26:34","guid":{"rendered":"https:\/\/karmaka.de\/?p=42025"},"modified":"2026-07-03T12:26:36","modified_gmt":"2026-07-03T10:26:36","slug":"remanent-crustal-strain-on-mars-in-non-poikilitic-olivine-of-nwa-7721-2","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=42025","title":{"rendered":"Remanent crustal strain on Mars in non-poikilitic olivine of NWA 7721<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Yaozhu Li, Szilvia Kal\u00e1cska, Phil J. A. McCausland, Roberta L. Flemming, Callum J. Hetherington, Bo Zhao, Can Yildirim &amp; Carsten Detlefs<\/p>\n\n\n\n<p>npj Space Exploration, Volume 2, Article number: 30<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s44453-026-00048-7\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/www.nature.com\/articles\/s44453-026-00048-7.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;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\u2009\u03bcm), weakly oriented, and nearly strain-free; coarser Type 2 subgrains (&gt;15\u2009\u03bcm), 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\u2013release 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 \u22482.3\u2009s, 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.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yaozhu Li, Szilvia Kal\u00e1cska, Phil J. A. McCausland, Roberta L. Flemming, Callum J. Hetherington, Bo Zhao, Can Yildirim &amp; Carsten Detlefs npj Space Exploration, Volume 2, Article number: 30 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;We&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1598,43],"tags":[6640,5578,1465,3631,1858,1006,4174,7009,292,1829],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42025"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=42025"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42025\/revisions"}],"predecessor-version":[{"id":42026,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42025\/revisions\/42026"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42025"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42025"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42025"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}