{"id":33874,"date":"2023-06-15T16:07:29","date_gmt":"2023-06-15T14:07:29","guid":{"rendered":"https:\/\/karmaka.de\/?p=33874"},"modified":"2023-06-15T17:22:59","modified_gmt":"2023-06-15T15:22:59","slug":"silicon-isotope-constraints-on-terrestrial-planet-accretion","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=33874","title":{"rendered":"Silicon isotope constraints on terrestrial planet accretion<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Isaac J. Onyett, Martin Schiller, Georgy V. Makhatadze, Zhengbin Deng, Anders Johansen &amp; Martin Bizzarro<\/p>\n\n\n\n<p>Nature<br>Published: 14 June 2023<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41586-023-06135-z\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/www.nature.com\/articles\/s41586-023-06135-z.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Understanding the nature and origin of the precursor material to terrestrial planets is key to deciphering the mechanisms and timescales of planet formation. Nucleosynthetic variability among rocky Solar System bodies can trace the composition of planetary building blocks. Here we report the nucleosynthetic composition of silicon (\u03bc30Si), the most abundant refractory planet-building element, in primitive and differentiated meteorites to identify terrestrial planet precursors. Inner Solar System differentiated bodies, including Mars, record \u03bc30Si deficits of \u221211.0\u2009\u00b1\u20093.2\u2009parts per million to \u22125.8\u2009\u00b1\u20093.0\u2009parts per million whereas non-carbonaceous and carbonaceous chondrites show \u03bc30Si excesses from 7.4\u2009\u00b1\u20094.3\u2009parts per million to 32.8\u2009\u00b1\u20092.0\u2009parts per million relative to Earth. This establishes that chondritic bodies are not planetary building blocks. Rather, material akin to early-formed differentiated asteroids must represent a major planetary constituent. The \u03bc30Si values of asteroidal bodies correlate with their accretion ages, reflecting progressive admixing of a \u03bc30Si-rich outer Solar System material to an initially \u03bc30Si-poor inner disk. Mars\u2019 formation before chondrite parent bodies is necessary to avoid incorporation of \u03bc30Si-rich material. In contrast, Earth\u2019s \u03bc30Si composition necessitates admixing of 26\u2009\u00b1\u20099\u2009per cent of \u03bc30Si-rich outer Solar System material to its precursors. The \u03bc30Si compositions of Mars and proto-Earth are consistent with their rapid formation by collisional growth and pebble accretion less than three million years after Solar System formation. Finally, Earth\u2019s nucleosynthetic composition for s-process sensitive (molybdenum and zirconium) and siderophile (nickel) tracers are consistent with pebble accretion when volatility-driven processes during accretion and the Moon-forming impact are carefully evaluated.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Isaac J. Onyett, Martin Schiller, Georgy V. Makhatadze, Zhengbin Deng, Anders Johansen &amp; Martin Bizzarro NaturePublished: 14 June 2023 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Understanding the nature and origin of the precursor material to terrestrial&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74,73],"tags":[80,1858,1761,2877,971,1009,114],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33874"}],"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=33874"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33874\/revisions"}],"predecessor-version":[{"id":33877,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33874\/revisions\/33877"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=33874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33874"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}