{"id":39900,"date":"2025-12-09T19:14:40","date_gmt":"2025-12-09T18:14:40","guid":{"rendered":"https:\/\/karmaka.de\/?p=39900"},"modified":"2025-12-09T19:14:41","modified_gmt":"2025-12-09T18:14:41","slug":"hydrothermal-alteration-of-ryugu-from-a-disruptive-impact-recorded-in-a-returned-sample","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=39900","title":{"rendered":"Hydrothermal alteration of Ryugu from a disruptive impact recorded in a returned sample<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Devin L. Schrader, Thomas J. Zega, Maizey C. Benner &amp; Jemma Davidson<\/p>\n\n\n\n<p>Nature Communications , Article number:    , article in press, Published: 09 December 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41467-025-67159-9\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/www.nature.com\/articles\/s41467-025-67159-9_reference.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Samples returned from C-type asteroid (162173) Ryugu by JAXA\u2019s Hayabusa2 spacecraft provide material free of terrestrial alteration for analysis. Previous work shows that Ryugu was aqueously altered below 100\u2009\u00b0C under neutral to alkaline fluid conditions. Such low-temperature alteration was unexpected based on spacecraft observations which indicated that Ryugu\u2019s surface may be thermally altered. Here we show that sulfides in a single particle (A0016) returned by the Hayabusa2 mission are unlike any previously described from Ryugu. The presence and compositions of violarite, pyrite, chalcopyrite, pentlandite, and Fe-depleted pyrrhotite grains provide direct evidence for hydrothermal alteration between 230 to 400\u2009\u00b0C under highly oxidizing and acidic fluid conditions. We hypothesize that A0016 was near to the site of a large impact that disrupted Ryugu\u2019s precursor parent body.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Devin L. Schrader, Thomas J. Zega, Maizey C. Benner &amp; Jemma Davidson Nature Communications , Article number: , article in press, Published: 09 December 2025 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Samples returned from C-type asteroid&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2350,2243,62],"tags":[3872,1854,1771,3991,4780,2180,5718],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39900"}],"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=39900"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39900\/revisions"}],"predecessor-version":[{"id":39901,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39900\/revisions\/39901"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}