{"id":13455,"date":"2017-08-10T17:36:34","date_gmt":"2017-08-10T15:36:34","guid":{"rendered":"http:\/\/karmaka.de\/?p=13455"},"modified":"2017-08-10T17:36:57","modified_gmt":"2017-08-10T15:36:57","slug":"zhamanshin-astrobleme-provides-evidence-for-carbonaceous-chondrite-and-post-impact-exchange-between-ejecta-and-earths-atmosphere","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=13455","title":{"rendered":"Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth\u2019s atmosphere<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Tom\u00e1\u0161 Magna, Karel \u017d\u00e1k, Andreas Pack, Fr\u00e9d\u00e9ric Moynier, B\u00e9reng\u00e8re Mougel, Stefan Peters, Roman Sk\u00e1la, \u0160\u00e1rka Jon\u00e1\u0161ov\u00e1, Ji\u0159\u00ed Mizera &#038; Zden\u011bk \u0158anda<\/p>\n<p>Nature Communications 8, Article number: 227 (2017)<br \/>\ndoi:10.1038\/s41467-017-00192-5<br \/>\nPublished online: 09 August 2017<\/p>\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41467-017-00192-5\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"https:\/\/www.nature.com\/articles\/s41467-017-00192-5.pdf\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;Chemical fingerprints of impacts are usually compromised by extreme conditions in the impact plume, and the contribution of projectile matter to impactites does not often exceed a fraction of per cent. Here we use chromium and oxygen isotopes to identify the impactor and impact-plume processes for Zhamanshin astrobleme, Kazakhstan. \u03b554Cr values up to 1.54 in irghizites, part of the fallback ejecta, represent the 54Cr-rich extremity of the Solar System range and suggest a CI-like chondrite impactor. \u039417O values as low as \u22120.22\u2030 in irghizites, however, are incompatible with a CI-like impactor. We suggest that the observed 17O depletion in irghizites relative to the terrestrial range is caused by partial isotope exchange with atmospheric oxygen (\u039417O\u2009=\u2009\u22120.47\u2030) following material ejection. In contrast, combined \u039417O\u2013\u03b554Cr data for central European tektites (distal ejecta) fall into the terrestrial range and neither impactor fingerprint nor oxygen isotope exchange with the atmosphere are indicated.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tom\u00e1\u0161 Magna, Karel \u017d\u00e1k, Andreas Pack, Fr\u00e9d\u00e9ric Moynier, B\u00e9reng\u00e8re Mougel, Stefan Peters, Roman Sk\u00e1la, \u0160\u00e1rka Jon\u00e1\u0161ov\u00e1, Ji\u0159\u00ed Mizera &#038; Zden\u011bk \u0158anda Nature Communications 8, Article number: 227 (2017) doi:10.1038\/s41467-017-00192-5 Published online: 09 August 2017 LINK&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90],"tags":[365,92,2888,3013],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13455"}],"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=13455"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13455\/revisions"}],"predecessor-version":[{"id":13457,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13455\/revisions\/13457"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13455"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13455"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}