{"id":14884,"date":"2018-05-25T06:50:55","date_gmt":"2018-05-25T04:50:55","guid":{"rendered":"http:\/\/karmaka.de\/?p=14884"},"modified":"2018-05-25T06:50:55","modified_gmt":"2018-05-25T04:50:55","slug":"jupiters-influence-on-the-building-blocks-of-mars-and-earth","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=14884","title":{"rendered":"Jupiter&#8217;s influence on the building blocks of Mars and Earth<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>R. Brasser, N. Dauphas, S. J. Mojzsis<\/p>\n<p>Accepted for publication in GRL<\/p>\n<p><a href=\"https:\/\/arxiv.org\/pdf\/1805.09449\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>Radiometric dating indicates that Mars accreted in the first ~4 Myr of solar system formation, which<br \/>\ncoincides with the formation and possible migration of Jupiter. While nebular gas from the protoplanetary<br \/>\ndisk was still present, Jupiter may have migrated inwards and tacked at 1.5 AU in a 3:2 resonance with<br \/>\nSaturn. This migration excited planetary building blocks in the inner solar system, resulting in extensive<br \/>\nmixing and planetesimal removal. Here we evaluate the plausible nature of Mars\u2019 building blocks, focusing<br \/>\nin particular on how its growth was influenced by the formation and migration of Jupiter. We use a<br \/>\ncombination of dynamical simulations and an isotopic mixing model that traces the accretion of elements<br \/>\nwith different affinities for metal. Dynamical simulations show that Jupiter\u2019s migration causes the late stages<br \/>\nof Earth\u2019s and Mars\u2019 accretion to be dominated by EC-type (enstatite chondrite) material due to the loss of<br \/>\nOC (ordinary chondrite) planetesimals. Our analysis of available isotopic data for SNC meteorites shows that<br \/>\nMars consists of approximately 68%+0-39 EC+32%+35-0 OC by mass (2\u03c3). The large uncertainties indicate that ). The large uncertainties indicate that isotopic analyses of martian samples are for the most part too imprecise to definitely test model predictions; in particular it remains uncertain whether or not Mars accreted predominantly EC material in the latter stages<br \/>\nof its formation history. Dynamical simulations also provide no definitive constraint on Mars\u2019 accretion<br \/>\nhistory due to the great variety of dynamical pathways that the martian embryo exhibits. The present work<br \/>\ncalls for new measurements of isotopic anomalies in SNC meteorites targeting siderophile elements (most<br \/>\nnotably Ni, Mo and Ru) to constrain Mars\u2019 accretion history and its formation location.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R. Brasser, N. Dauphas, S. J. Mojzsis Accepted for publication in GRL PDF (OPEN ACCESS) Radiometric dating indicates that Mars accreted in the first ~4 Myr of solar system formation, which coincides with the formation&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131,45,112,17,122,42,44,7,43],"tags":[1813,2267,2573,1858,2254,1828,1807],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14884"}],"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=14884"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14884\/revisions"}],"predecessor-version":[{"id":14885,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14884\/revisions\/14885"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14884"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}