{"id":36275,"date":"2024-06-04T16:30:15","date_gmt":"2024-06-04T14:30:15","guid":{"rendered":"https:\/\/karmaka.de\/?p=36275"},"modified":"2024-06-04T16:31:19","modified_gmt":"2024-06-04T14:31:19","slug":"condensation-of-refractory-minerals-on-igneous-compact-type-a-ca-al-rich-inclusion-from-northwest-africa-7865-cv-chondrite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=36275","title":{"rendered":"Condensation of refractory minerals on igneous compact type A Ca-Al-rich inclusion from Northwest Africa 7865 CV chondrite<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Akimasa Suzumura, Noriyuki Kawasaki, Hisayoshi Yurimoto, Shoichi Itoh<\/p>\n\n\n\n<p>MAPS, Version of Record online: 03 June 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.14222\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.14222\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;A melilite-rich, compact type A Ca-Al-rich inclusion (CAI), KU-N-02, from the reduced CV3 chondrite Northwest Africa 7865, is mantled by an \u00e5kermanite-poor layer. We carried out a combined study of petrographic observations and in situ O and Al\u2013Mg isotopic measurements for KU-N-02. The core shows a typical texture of igneous compact type A CAIs. The mantle consists of spinel, \u00e5kermanite-poor melilite, and perovskite. Individual mantle melilite crystals show reverse zoning toward the crystal grain boundary, in contrast to core melilite crystals showing normal zoning. The O isotopic compositions of the minerals in KU-N-02 plot along the carbonaceous chondrite anhydrous mineral line on a three O-isotope diagram. The mantle and core spinel crystals are uniformly 16O-rich (\u039417O\u2009~\u2009\u221223\u2030). The mantle melilite crystals exhibit variable O isotopic compositions ranging between \u039417O\u2009~\u2009\u22122\u2030 and\u2009\u22129\u2030, in contrast to the uniformly 16O-poor (\u039417O\u2009~\u2009\u22122\u2030) core melilite. The mantle melilite crystals also exhibit variable \u03b425Mg values (\u03b425MgDSM-3\u2009~\u2009\u22122\u2030 to +3\u2030) compared with the nearly constant \u03b425Mg values of the core melilite (\u03b425MgDSM-3\u2009~\u2009+2\u2030). The mantle minerals are likely to have formed by condensation from the solar nebular gas after core formation. The Al\u2013Mg mineral isochrons of the core and mantle give initial 26Al\/27Al ratios of (4.66\u2009\u00b1\u20090.15)\u2009\u00d7\u200910\u22125 and (4.74\u2009\u00b1\u20090.14)\u2009\u00d7\u200910\u22125, respectively. The age difference between the core and mantle formation is estimated to be within ~0.05 Myr, implying that both melting and condensation processes in the variable O isotopically solar nebular environments occurred within a short time during single CAI formation.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Akimasa Suzumura, Noriyuki Kawasaki, Hisayoshi Yurimoto, Shoichi Itoh MAPS, Version of Record online: 03 June 2024 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;A melilite-rich, compact type A Ca-Al-rich inclusion (CAI), KU-N-02, from the reduced CV3 chondrite&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,9,14,22,57,2531],"tags":[1846,1356,462,3636,384,5181,5914,135,3023,675],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36275"}],"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=36275"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36275\/revisions"}],"predecessor-version":[{"id":36276,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36275\/revisions\/36276"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}