{"id":31147,"date":"2022-08-17T21:21:32","date_gmt":"2022-08-17T19:21:32","guid":{"rendered":"https:\/\/karmaka.de\/?p=31147"},"modified":"2022-08-17T21:21:33","modified_gmt":"2022-08-17T19:21:33","slug":"the-nadir-crater-offshore-west-africa-a-candidate-cretaceous-paleogene-impact-structure","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=31147","title":{"rendered":"The Nadir Crater offshore West Africa: A candidate Cretaceous-Paleogene impact structure<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Uisdean Nicholson, Veronica J. Bray, Sean P. S. Gulick and Benedict Aduomahor<\/p>\n\n\n\n<p>Science Advances<br>17 Aug 2022<br>Vol 8, Issue<\/p>\n\n\n\n<p><a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.abn3096\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/www.science.org\/doi\/epdf\/10.1126\/sciadv.abn3096\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Evidence of marine target impacts, binary impact craters, or impact clusters are rare on Earth. Seismic reflection data from the Guinea Plateau, West Africa, reveal a \u22658.5-km-wide structure buried below ~300 to 400 m of Paleogene sediment with characteristics consistent with a complex impact crater. These include an elevated rim above a terraced crater floor, a pronounced central uplift, and extensive subsurface deformation. Numerical simulations of crater formation indicate a marine target (~800-m water depth) impact of a \u2265400-m asteroid, resulting in a train of large tsunami waves and the potential release of substantial quantities of greenhouse gases from shallow buried black shale deposits. Our stratigraphic framework suggests that the crater formed at or near the Cretaceous-Paleogene boundary (~66 million years ago), approximately the same age as the Chicxulub impact crater. We hypothesize that this formed as part of a closely timed impact cluster or by breakup of a common parent asteroid.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uisdean Nicholson, Veronica J. Bray, Sean P. S. Gulick and Benedict Aduomahor Science Advances17 Aug 2022Vol 8, Issue LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Evidence of marine target impacts, binary impact craters, or impact clusters are&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3177,90],"tags":[95,2053,92,6351],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31147"}],"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=31147"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31147\/revisions"}],"predecessor-version":[{"id":31148,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31147\/revisions\/31148"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}