{"id":11791,"date":"2017-02-20T21:49:13","date_gmt":"2017-02-20T20:49:13","guid":{"rendered":"http:\/\/karmaka.de\/?p=11791"},"modified":"2017-02-20T21:49:13","modified_gmt":"2017-02-20T20:49:13","slug":"iron-isotopic-fractionation-between-silicate-mantle-and-metallic-core-at-high-pressure","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=11791","title":{"rendered":"Iron isotopic fractionation between silicate mantle and metallic core at high pressure<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Jin Liu, Nicolas Dauphas, Mathieu Roskosz, Michael Y. Hu, Hong Yang, Wenli Bi, Jiyong Zhao, Esen E. Alp, Justin Y. Hu &#038; Jung-Fu Lin<\/p>\n<p>Nature Communications 8,<br \/>\nArticle number: 14377 (2017)<br \/>\ndoi:10.1038\/ncomms14377<\/p>\n<p><a href=\"http:\/\/www.nature.com\/articles\/ncomms14377\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"http:\/\/www.nature.com\/articles\/ncomms14377.pdf\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;The +0.1\u2030 elevated 56Fe\/54Fe ratio of terrestrial basalts relative to chondrites was proposed to be a fingerprint of core-mantle segregation. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure\u2013temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron-rich alloys, even at high pressure. From the measured mean force constants of iron bonds, we calculate an equilibrium iron isotope fractionation between silicate and iron under core formation conditions in Earth of \u223c0\u20130.02\u2030, which is small relative to the +0.1\u2030 shift of terrestrial basalts. This result is unaffected by small amounts of nickel and candidate core-forming light elements, as the isotopic shifts associated with such alloying are small. This study suggests that the variability in iron isotopic composition in planetary objects cannot be due to core formation.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jin Liu, Nicolas Dauphas, Mathieu Roskosz, Michael Y. Hu, Hong Yang, Wenli Bi, Jiyong Zhao, Esen E. Alp, Justin Y. Hu &#038; Jung-Fu Lin Nature Communications 8, Article number: 14377 (2017) doi:10.1038\/ncomms14377 LINK (OPEN ACCESS)&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,45,922,75,112,33,122,42,44,73,43,186],"tags":[1208,462,3680,3679,212,3681,1858,1872],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11791"}],"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=11791"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11791\/revisions"}],"predecessor-version":[{"id":11792,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11791\/revisions\/11792"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}