{"id":21248,"date":"2020-01-16T06:51:37","date_gmt":"2020-01-16T05:51:37","guid":{"rendered":"http:\/\/karmaka.de\/?p=21248"},"modified":"2020-01-18T09:28:40","modified_gmt":"2020-01-18T08:28:40","slug":"heterogeneous-accretion-of-earth-inferred-from-mo-ru-isotope-systematics","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=21248","title":{"rendered":"Heterogeneous accretion of Earth inferred from Mo-Ru isotope systematics<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Timo Hopp, Gerrit Budde, Thorsten Kleine <\/p>\n\n\n\n<p>Earth and Planetary Science Letters (17 January 2020)<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/pdf\/2001.05405\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0012821X2030008X\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The Mo and Ru isotopic compositions of meteorites and the bulk silicate Earth (BSE) hold important clues about the provenance of Earth&#8217;s building material. Prior studies have argued that non-carbonaceous (NC) and carbonaceous (CC) meteorite groups together define a Mo-Ru &#8216;cosmic&#8217; correlation, and that the BSE plots on the extension of this correlation. These observations were taken as evidence that the final 10-15% of Earth&#8217;s accreted material derived from a homogeneous inner disk reservoir with an enstatite chondrite-like isotopic composition. Here, using new Mo and Ru isotopic data for previously uninvestigated meteorite groups, we show that the Mo-Ru correlation only exists for NC meteorites, and that both the BSE and CC meteorites fall off this Mo-Ru correlation. These observations indicate that the final stages of Earth&#8217;s accretion were heterogeneous and consisted of a mixture of NC and CC materials. The Mo-Ru isotope systematics are best accounted for by either an NC heritage of the late veneer combined with a CC heritage of the Moon-forming giant impactor, or by mixed NC-CC compositions for both components. The involvement of CC bodies in the late-stage accretionary assemblage of Earth is consistent with chemical models for core-mantle differentiation, which argue for the addition of more oxidized and volatile-rich material toward the end of Earth&#8217;s formation. As such, this study resolves the inconsistencies between homogeneous accretion models based on prior interpretations of the Mo-Ru systematics of meteorites and the chemical evidence for heterogeneous accretion of Earth. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Timo Hopp, Gerrit Budde, Thorsten Kleine Earth and Planetary Science Letters (17 January 2020) PDF (OPEN ACCESS) LINK (OPEN ACCESS) &#8220;The Mo and Ru isotopic compositions of meteorites and the bulk silicate Earth (BSE) hold&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30,131,38,40,112,17,31,765,7,507,39,32],"tags":[5374,963,4819,5376,5379,5375,5377,5388,5380,5367,5386,4383,3930,4453,4857,3858,5369,5382,5381,5370,5384,5378,5371,2917,960,961,4873,5385,5383,5387,4445,5372,4941],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21248"}],"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=21248"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21248\/revisions"}],"predecessor-version":[{"id":21256,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21248\/revisions\/21256"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}