{"id":40210,"date":"2026-02-26T06:59:13","date_gmt":"2026-02-26T05:59:13","guid":{"rendered":"https:\/\/karmaka.de\/?p=40210"},"modified":"2026-02-26T06:59:14","modified_gmt":"2026-02-26T05:59:14","slug":"small-scale-elemental-abundance-variations-in-ryugu-particles-from-touchdown-1","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=40210","title":{"rendered":"Small-scale elemental abundance variations in Ryugu particles from touchdown 1<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Karina L\u00f3pez Garc\u00eda, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai<\/p>\n\n\n\n<p>MAPS, Version of Record online: 25 February 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70109\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70109\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Ryugu materials closely resemble CI chondrites\u2019 mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5\u20134.3 mg) from the \ufb01rst touchdown site (TD1) were determined using triple\u2013quadrupole inductively coupled plasma mass spectrometry (TQ-ICP-MS). These samples show broad abundance ranges (0.4\u20134 9 CI) for elements commonly hosted in minor secondary phases including P, Ca, Mn, Sr, Y, Ba, and rare earth elements (REE), and display distinct<br>covariation patterns among these elements. Combining our data with previous analyses of TD1 Ryugu particles, we identi\ufb01ed three compositional types: Type 1 particles are enriched by 20% in P, Ca, Mn, Sr, and REE relative to the Ryugu average; Type 3 particles are depleted\nby &gt;20% in these elements but show slight enrichments (up to 30%) in siderophile and chalcophile elements; Type 2 particles have most elemental abundances within +-20% of the Ryugu average. These wide abundance ranges re\ufb02ect heterogeneous distribution (nugget effect) of minor secondary minerals within Ryugu\u2019s parent body. Such heterogeneity provides insights into the evolving conditions of alteration \ufb02uids and the consequent elemental fractionation patterns. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Karina L\u00f3pez Garc\u00eda, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai MAPS, Version of Record online: 25 February 2026 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Ryugu materials closely resemble CI chondrites\u2019&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2243,1184],"tags":[3872,1854,263,4844,1867,4899],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40210"}],"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=40210"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40210\/revisions"}],"predecessor-version":[{"id":40211,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40210\/revisions\/40211"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}