{"id":41341,"date":"2026-04-11T17:35:47","date_gmt":"2026-04-11T15:35:47","guid":{"rendered":"https:\/\/karmaka.de\/?p=41341"},"modified":"2026-04-11T17:35:48","modified_gmt":"2026-04-11T15:35:48","slug":"confirming-the-impact-origin-of-the-sao-miguel-do-tapuio-structure-northeastern-brazil","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=41341","title":{"rendered":"Confirming the impact origin of the S\u00e3o Miguel do Tapuio structure, northeastern Brazil<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Alvaro Penteado Cr\u00f3sta, Neivaldo Ara\u00fajo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferri\u00e8re, Wolf Uwe Reimold, Ana Maria G\u00f3es, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco<\/p>\n\n\n\n<p>MAPS, First published: 10 April 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70144\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70144\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The S\u00e3o Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21\u2009km diameter, centered at 5\u00b037.6\u2032\u2009S, 41\u00b023.3\u2032\u2009W in Piau\u00ed state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic\u2013Mesozoic Parna\u00edba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and Cabe\u00e7as formations. SMT exhibits a rugged morphology, in contrast to the smoother surrounding terrain. An impact origin has been suggested for SMT since the 1980s based on indirect aspects, such as the structure&#8217;s morphology with an annular outer rim, inner rings, and an elevated central area. Some of the sandstones found in the inner region were structurally deformed and recrystallized, in contrast to the undeformed equivalent strata outside the structure. A field survey conducted in 2017 yielded a few samples of sandstone and monomict sandstone breccia from near the center of the structure. Here we report the discovery of multiple shocked quartz grains with planar fractures (PFs), feather features (FFs), and planar deformation features (PDFs) in four thin sections of two samples from this central area. Universal stage measurements on all shocked quartz grains (25 grains in total; 16 with PFs, five with PDFs, and four with both PFs and PDFs) confirm that these planar microstructures occur in distinct crystallographic orientations that are indicative of shock pressures up to 20\u2009GPa. Our investigations, thus, have confirmed the impact origin of the SMT. It represents the ninth confirmed impact structure in Brazil and, at 21\u2009km diameter, is the second largest of its kind in South America.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alvaro Penteado Cr\u00f3sta, Neivaldo Ara\u00fajo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferri\u00e8re, Wolf Uwe Reimold, Ana Maria G\u00f3es, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco MAPS,&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90],"tags":[92,2608],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/41341"}],"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=41341"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/41341\/revisions"}],"predecessor-version":[{"id":41342,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/41341\/revisions\/41342"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=41341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}