{"id":11088,"date":"2016-12-22T08:47:35","date_gmt":"2016-12-22T07:47:35","guid":{"rendered":"http:\/\/karmaka.de\/?p=11088"},"modified":"2016-12-22T08:48:04","modified_gmt":"2016-12-22T07:48:04","slug":"chromium-isotope-evidence-in-ejecta-deposits-for-the-nature-of-paleoproterozoic-impactors","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=11088","title":{"rendered":"Chromium isotope evidence in ejecta deposits for the nature of Paleoproterozoic impactors<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Berengere Mougel, Frederic Moynier, Christa Gopel, Christian Koeberl<\/p>\n<p><a href=\"http:\/\/arxiv.org\/pdf\/1612.06922\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"https:\/\/arxiv.org\/abs\/1612.06922\" target=\"_blank\"><strong>abstract<\/strong><\/a><\/p>\n<p>&#8220;Non-mass dependent chromium isotopic signatures have been successfully used to determine the presence and identification of extra-terrestrial materials in terrestrial impact rocks. Paleoproterozoic spherule layers from Greenland (Graenseso) and Russia (Zaonega), as well as some distal ejecta deposits (Lake Superior region) from the Sudbury impact (1,849 +\/- 0.3 Ma) event, have been analyzed for their Cr isotope compositions. Our results suggest that 1) these distal ejecta deposits are all of impact origin, 2) the Graenseso and Zaonega spherule layers contain a distinct carbonaceous chondrite component, and are possibly related to the same impact event, which could be Vredefort (2,023 +\/- 4 Ma) or another not yet identified large impact event from that of similar age, and 3) the Sudbury ejecta record a complex meteoritic signature, which is different from the Graenseso and Zaonega spherule layers, and could indicate the impact of a heterogeneous chondritic body. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Berengere Mougel, Frederic Moynier, Christa Gopel, Christian Koeberl PDF (OPEN ACCESS) abstract &#8220;Non-mass dependent chromium isotopic signatures have been successfully used to determine the presence and identification of extra-terrestrial materials in terrestrial impact rocks. Paleoproterozoic&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,90],"tags":[2529,2268,95,365,3470,3468,2888,3467,310,3471,3469],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11088"}],"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=11088"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11088\/revisions"}],"predecessor-version":[{"id":11089,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/11088\/revisions\/11089"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}