{"id":25733,"date":"2021-01-18T10:33:32","date_gmt":"2021-01-18T09:33:32","guid":{"rendered":"http:\/\/karmaka.de\/?p=25733"},"modified":"2021-01-18T10:33:33","modified_gmt":"2021-01-18T09:33:33","slug":"fe%e2%80%90redox-changes-in-itokawa-space%e2%80%90weathered-rims","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=25733","title":{"rendered":"Fe\u2010redox changes in Itokawa space\u2010weathered rims<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>L. J. Hicks, J. C. Bridges, T. Noguchi, A. Miyake, J. D. Piercy, S. H. Baker<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<br>Version of Record online: 18 January 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13611\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13611\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Synchrotron Fe\u2010K X\u2010ray absorption spectroscopy and transmission electron microscopy have been used to investigate the mineralogy and Fe\u2010redox variations in the space\u2010weathered (SW) rims of asteroidal samples. This study focuses on the FIB lift\u2010out sections from five Itokawa grains, returned by the Hayabusa spacecraft, including samples RB\u2010QD04\u20100063, RB\u2010QD04\u20100080, RB\u2010CV\u20100011, RB\u2010CV\u20100089, and RB\u2010CV\u20100148. Each of the samples featured partially amorphized SW rims, caused by irradiation damage from implanted low mass solar wind ions, and the impacting of micrometeorites. Using bright\u2010field and HAADF\u2010STEM imaging, vesicular blistering and nanophase Fe metal (npFe0) particles were observed within grain rims, and solar flare tracks were observed in the substrate host grain, confirming the presence of SW zones. We use Fe\u2010K XANES mapping to investigate Fe\u2010redox changes between the host mineral and the SW zones. All SW zones measured show some increases in the ferric\u2010ferrous ratio (Fe3+\/\u03a3Fe) relative to their respective host grains, likely the result of the implanted solar wind H+ ions reacting with the segregated ferrous Fe in the surface material.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L. J. Hicks, J. C. Bridges, T. Noguchi, A. Miyake, J. D. Piercy, S. H. Baker Meteoritics &amp; Planetary ScienceVersion of Record online: 18 January 2021 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Synchrotron Fe\u2010K X\u2010ray absorption&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,182,181],"tags":[1854,1871,792],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25733"}],"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=25733"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25733\/revisions"}],"predecessor-version":[{"id":25734,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25733\/revisions\/25734"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}