{"id":28618,"date":"2021-08-17T17:24:18","date_gmt":"2021-08-17T15:24:18","guid":{"rendered":"https:\/\/karmaka.de\/?p=28618"},"modified":"2021-08-17T17:24:18","modified_gmt":"2021-08-17T15:24:18","slug":"iron-and-nickel-isotopes-in-iid-and-ivb-iron-meteorites-evidence-for-admixture-of-an-sn-ii-component-and-implications-for-the-initial-abundance-of-60fe","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=28618","title":{"rendered":"Iron and Nickel Isotopes in IID and IVB Iron Meteorites: Evidence for Admixture of an SN II Component and Implications for the Initial Abundance of 60Fe"},"content":{"rendered":"\n<p>David L. Cook, Bradley S. Meyer, and Maria Sch\u00f6nb\u00e4chler<\/p>\n\n\n\n<p>The Astrophysical Journal, Volume 917, Number 2<\/p>\n\n\n\n<p><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/1538-4357\/ac0add\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;We measured Fe and Ni isotopes in 13 iron meteorites from magmatic groups IID and IVB. Resolvable deficits (\u2248\u22120.14) are observed in \u03b560Ni in both groups. Small deficits (\u2248\u22120.08) are also evident in \u03b556Fe but not in the most neutron-rich isotope of Fe (58Fe). Relative to terrestrial material, the observed \u03b5iFe values are consistent with the presence of a small excesses of material in the parent bodies of IID and IVB irons that was produced in a type II supernova. The \u03b560Ni and \u03b556Fe values are uncorrelated in both groups. This is consistent with a nucleosynthetic origin of the \u03b556Fe deficits, whereas the \u03b560Ni deficits are best explained as radiogenic in nature due to the former presence of live 60Fe (t1\/2 = 2.62 Ma) in the early solar system. The 60Ni deficits correspond to 60Fe\/56Fe ratios of \u22483 \u00d7 10\u22127 at the time of core formation on the IID and IVB parent bodies. These data, in conjunction with previously published 182Hf\u2013182W core formation ages, are used to estimate a solar system initial 60Fe\/56Fe = (6.4 \u00b1 2.0) \u00d7 10\u22127 for the formation region of carbonaceous chondrites.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>David L. Cook, Bradley S. Meyer, and Maria Sch\u00f6nb\u00e4chler The Astrophysical Journal, Volume 917, Number 2 LINK &#8220;We measured Fe and Ni isotopes in 13 iron meteorites from magmatic groups IID and IVB. Resolvable deficits&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[851,214,256],"tags":[852,1033,449,2415,4041,4421,1897,2410,1900,5808],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28618"}],"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=28618"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28618\/revisions"}],"predecessor-version":[{"id":28619,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28618\/revisions\/28619"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}