{"id":28378,"date":"2021-07-09T22:07:37","date_gmt":"2021-07-09T20:07:37","guid":{"rendered":"https:\/\/karmaka.de\/?p=28378"},"modified":"2021-07-10T00:48:49","modified_gmt":"2021-07-09T22:48:49","slug":"survival-of-presolar-p-nuclide-carriers-in-the-nebula-revealed-by-stepwise-leaching-of-allende-refractory-inclusions","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=28378","title":{"rendered":"Survival of presolar p-nuclide carriers in the nebula revealed by stepwise leaching of Allende refractory inclusions<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Bruce L. A. Charlier, Fran\u00e7ois L. H. Tissot, Hauke Vollstaedt, Nicolas Dauphas, Colin J. N. Wilson, Ren T. Marquez<\/p>\n\n\n\n<p>Science Advances 09 Jul 2021:<br>Vol. 7, no. 28, eabf6222<\/p>\n\n\n\n<p><a href=\"https:\/\/advances.sciencemag.org\/content\/7\/28\/eabf6222\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/advances.sciencemag.org\/content\/advances\/7\/28\/eabf6222.full.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The 87Rb-87Sr radiochronometer provides key insights into the timing of volatile element depletion in planetary bodies, yet the unknown nucleosynthetic origin of Sr anomalies in Ca-Al\u2013rich inclusions (CAIs, the oldest dated solar system solids) challenges the reliability of resulting chronological interpretations. To identify the nature of these Sr anomalies, we performed step-leaching experiments on nine unmelted CAIs from Allende. In six CAIs, the chemically resistant residues (0.06 to 9.7% total CAI Sr) show extreme positive \u03bc84Sr (up to +80,655) and 87Sr variations that cannot be explained by decay of 87Rb. The extreme 84Sr but more subdued 87Sr anomalies are best explained by the presence of a presolar carrier enriched in the p-nuclide 84Sr. We argue that this unidentified carrier controls the isotopic anomalies in bulk CAIs and outer solar system materials, which reinstates the chronological significance of differences in initial 87Sr\/86Sr between CAIs and volatile-depleted inner solar system materials.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bruce L. A. Charlier, Fran\u00e7ois L. H. Tissot, Hauke Vollstaedt, Nicolas Dauphas, Colin J. N. Wilson, Ren T. Marquez Science Advances 09 Jul 2021:Vol. 7, no. 28, eabf6222 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;The 87Rb-87Sr&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,72,76,57,71],"tags":[1965,3389,108,1846,6037,135,5212,2992],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28378"}],"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=28378"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28378\/revisions"}],"predecessor-version":[{"id":28379,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28378\/revisions\/28379"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}