{"id":36085,"date":"2024-05-01T10:35:27","date_gmt":"2024-05-01T08:35:27","guid":{"rendered":"https:\/\/karmaka.de\/?p=36085"},"modified":"2024-05-01T10:35:29","modified_gmt":"2024-05-01T08:35:29","slug":"the-earth-atmosphere-like-bulk-nitrogen-isotope-composition-obtained-by-stepwise-combustion-analyses-of-ryugu-return-samples","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=36085","title":{"rendered":"The Earth atmosphere-like bulk nitrogen isotope composition obtained by stepwise combustion analyses of Ryugu return samples<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Ko Hashizume, Akizumi Ishida, Ayano Chiba, Ryuji Okazaki, Kasumi Yogata, Toru Yada, Fumio Kitajima, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Yoshinori Takano, Kanako Sakamoto, Shogo Tachibana, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoshi Tanaka, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Michael W. Broadley, Henner Busemann, the Hayabusa2 Initial Analysis Volatile Team<\/p>\n\n\n\n<p>MAPS, Version of Record online: 30 April 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.14175\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.14175\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The nitrogen isotope compositions of two samples returned from the asteroid Ryugu were determined using a stepwise combustion method, along with Ivuna (CI) and Y-980115, a CI-like Antarctic meteorite, as references. The two Ryugu samples A0105-07 and C0106-07 showed bulk \u03b415N values of +1.7\u2009\u00b1\u20090.5\u2030 and +0.2\u2009\u00b1\u20090.6\u2030, respectively, significantly lower than Ivuna with +36.4\u2009\u00b1\u20090.4\u2030, but close to Y-980115 with +4.0\u2009\u00b1\u20090.3\u2030. The Ryugu samples are further characterized by C\/N and 36Ar\/N ratios up to 3.4\u00d7 and 4.9\u00d7 the value of Ivuna, respectively. Among all Ryugu samples and CI chondrites, a positive correlation was observed between nitrogen concentrations and \u03b415N values, with samples with lower nitrogen concentrations exhibiting lower \u03b415N. This trend is explained by a two-component mixing model. One component is present at a constant abundance among all CI-related samples, with a \u03b415N value around 0\u2030 or lower. The other varies in abundance between different samples, and exhibits a \u03b415N value of +56\u2009\u00b1\u20094\u2030. The first 15N-poor endmember is seemingly tightly incorporated into a carbonaceous host phase, whereas the 15N-rich endmember can be mobilized and decoupled from carbon, potentially because it is in the form of ammonia. Asteroid materials with volatile compositions that are similar to those reported here for the Ryugu samples are attractive candidates for the volatile sources among Earth&#8217;s building blocks.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ko Hashizume, Akizumi Ishida, Ayano Chiba, Ryuji Okazaki, Kasumi Yogata, Toru Yada, Fumio Kitajima, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Yoshinori Takano, Kanako Sakamoto, Shogo Tachibana, Masahiro Nishimura, Aiko Nakato, Akiko&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,9,10,112,2243],"tags":[3872,542,2005,4817,3273,5007,3152,734,2346,4899,731],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36085"}],"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=36085"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36085\/revisions"}],"predecessor-version":[{"id":36086,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36085\/revisions\/36086"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36085"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}