{"id":28032,"date":"2021-06-09T13:44:08","date_gmt":"2021-06-09T11:44:08","guid":{"rendered":"https:\/\/karmaka.de\/?p=28032"},"modified":"2021-06-09T13:44:57","modified_gmt":"2021-06-09T11:44:57","slug":"exogenous-copper-sulfide-in-returned-asteroid-itokawa-regolith-grains-are-likely-relicts-of-prior-impacting-body","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=28032","title":{"rendered":"Exogenous copper sulfide in returned asteroid Itokawa regolith grains are likely relicts of prior impacting body<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Katherine D. Burgess &amp; Rhonda M. Stroud<\/p>\n\n\n\n<p>Communications Earth &amp; Environment, Volume 2, Article number: 115 (2021)<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s43247-021-00187-7\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/www.nature.com\/articles\/s43247-021-00187-7.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Samples from asteroid 25143 Itokawa returned by the Hayabusa mission have been identified as LL4-6 ordinary chondrite materials and have shown it to be a rubble pile that aggregated after break-up of a parent body. Here we investigate particle RB-CV-0038 from the Itokawa regolith using scanning and transmission electron microscopy and energy dispersive spectroscopy. We identify a cubanite-chalcopyrite-troilite-pyrrhotite assemblage, the phases and structure of which are indicative of low-temperature, aqueous alteration. Cubanite is stable only at temperatures below around 250\u2009\u00b0C and has thus far only been identified in CI carbonaceous chondrites and the comet 81P\/Wild2 sample suite. Chalcopyrite is also very rare in the meteorite record and is found mostly in R chondrites and some CK chondrites. Because the Itokawa parent body experienced significant thermal alteration with little evidence of low-temperature equilibration or aqueous alteration, we propose that the assemblage we identify is most likely exogenous and represents a component of an impacting body.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Katherine D. Burgess &amp; Rhonda M. Stroud Communications Earth &amp; Environment, Volume 2, Article number: 115 (2021) LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Samples from asteroid 25143 Itokawa returned by the Hayabusa mission have been identified&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,182,24,7,181],"tags":[1005,5716,1871,2343,792,4639,2139,4899],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28032"}],"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=28032"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28032\/revisions"}],"predecessor-version":[{"id":28033,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28032\/revisions\/28033"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}