{"id":31310,"date":"2022-09-29T22:05:25","date_gmt":"2022-09-29T20:05:25","guid":{"rendered":"https:\/\/karmaka.de\/?p=31310"},"modified":"2022-09-29T22:13:39","modified_gmt":"2022-09-29T20:13:39","slug":"earths-composition-was-modified-by-collisional-erosion","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=31310","title":{"rendered":"Earth\u2019s composition was modified by collisional erosion"},"content":{"rendered":"\n<p>Paul Frossard, Claudine Israel, Audrey Bouvier, Maud Boyet<\/p>\n\n\n\n<p>Science<br>29 Sep 2022<br>Vol 377, Issue 6614<br>pp. 1529-1532<\/p>\n\n\n\n<p><a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.abq7351\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/www.science.org\/action\/downloadSupplement?doi=10.1126%2Fscience.abq7351&amp;file=science.abq7351_sm.pdf\" target=\"_blank\"><strong>Supplementary Materials<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The samarium-146 (146Sm)\u2013neodymium-142 (142Nd) short-lived decay system (half-life of 103 million years) is a powerful tracer of the early mantle-crust evolution of planetary bodies. However, an increased 142Nd\/144Nd in modern terrestrial rocks relative to chondrite meteorites has been proposed to be caused by nucleosynthetic anomalies, obscuring early Earth\u2019s differentiation history. We use stepwise dissolution of primitive chondrites to quantify nucleosynthetic contributions on the composition of chondrites. After correction for nucleosynthetic anomalies, Earth and the silicate parts of differentiated planetesimals contain resolved excesses of 142Nd relative to chondrites. We conclude that only collisional erosion of primordial crusts can explain such compositions. This process associated with planetary accretion must have produced substantial loss of incompatible elements, including long-term heat-producing elements such as uranium, thorium, and potassium.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Paul Frossard, Claudine Israel, Audrey Bouvier, Maud Boyet Science29 Sep 2022Vol 377, Issue 6614pp. 1529-1532 LINK Supplementary Materials &#8220;The samarium-146 (146Sm)\u2013neodymium-142 (142Nd) short-lived decay system (half-life of 103 million years) is a powerful tracer of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131,9,10,14,112,25,26,17,6,23,7,335],"tags":[1963,1171,705,1851,6378,3266,108,3273,362,80,2001,1813,6379,1621,1807,110,6380,3727,1293,1681,3672,463],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31310"}],"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=31310"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31310\/revisions"}],"predecessor-version":[{"id":31313,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31310\/revisions\/31313"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}