LINK<\/strong><\/a><\/p>\n\n\n\n“We studied a unique super\u2010refractory inclusion with a core\u2010mantle structure from CO3.0 Yamato 81020 by secondary ion mass spectrometry, electron microprobe, and scanning electron microscope techniques. The core consists largely of hibonite and nonstoichiometric Al\u2010rich spinel indicating formation as a liquid at an exceptionally high temperature (>1900 \u00b0C). The mantle consists almost entirely of melilite with gehlenitic compositions (ranging from \u00c5k2 to \u00c5k25). The oxygen\u2010 and magnesium\u2010isotopic compositions of the core and mantle are very different; typically, \u039417O (\u2261\u03b417O \u2212 0.52 \u03b418O) ~\u201326\u2030 and \u0192Mg (mass fractionation of Mg isotopes) ~10\u2030\/amu in the core and \u039417O ~\u20137\u2030 and \u0192Mg ~1\u2030\/amu in most of the mantle. The chemical and O, Mg\u2010isotopic data indicate that the core and mantle formed in separate events, and that the melilite now in the core was formed during the mantle\u2010melting event, probably filling preexisting voids and surficial cavities. Analyses of core and mantle phases plot along a single 26Al\u201026Mg isochron with initial (26Al\/27Al)0 corresponding to 4.8 \u00b1 1.0 (\u00b12\u03c3) \u00d7 10\u20135, suggesting a similar formation age to normal CAIs in chondrites.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Hisayoshi Yurimoto, Alan E. Rubin, Shoichi Itoh, John T. Wasson Meteoritics & Planetary ScienceVersion of Record online: 03 May 2021 LINK “We studied a unique super\u2010refractory inclusion with a core\u2010mantle structure from CO3.0 Yamato 81020…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,19,57],"tags":[3273,1814,135,1655],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27665"}],"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=27665"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27665\/revisions"}],"predecessor-version":[{"id":27666,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27665\/revisions\/27666"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27665"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27665"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}