{"id":20561,"date":"2019-10-16T12:29:47","date_gmt":"2019-10-16T10:29:47","guid":{"rendered":"http:\/\/karmaka.de\/?p=20561"},"modified":"2019-10-16T12:30:35","modified_gmt":"2019-10-16T10:30:35","slug":"the-late-ordovician-sandbian-glasford-structure-a-marine%e2%80%90target-impact-crater-with-a-possible-connection-to-the-ordovician-meteorite-event","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20561","title":{"rendered":"The Late Ordovician (Sandbian) Glasford structure: A marine\u2010target impact crater with a possible connection to the Ordovician meteorite event"},"content":{"rendered":"\n<p>Charles C. Monson, Dustin Sweet, Branimir Segvic, Giovanni Zanoni, Kyle Balling, Jacalyn M. Wittmer, G. Robert Ganis, Guo Cheng<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science <br>\nFirst Published:  15 October 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13401\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The Glasford structure in Illinois (USA) was recognized as a buried impact crater in the early 1960s but has never been reassessed in light of recent advances in planetary science. Here, we document shatter cones and previously unknown quartz microdeformation features that support an impact origin for the Glasford structure. We identify the 4 km wide structure as a complex buried impact crater and describe syn\u2010 and postimpact deposits from its annular trough. We have informally designated these deposits as the Kingston Mines unit (KM). The fossils and sedimentology of the KM indicate a marine depositional setting. The various intervals within the KM constitute a succession of breccia, carbonate, sandstone, and shale similar to marine sedimentary successions preserved in other craters. Graptolite specimens retrieved from the KM place the time of deposition at approximately 455 \u00b1 2 Ma (Late Ordovician, Sandbian). This age determination suggests a possible link between the Glasford impact and the Ordovician meteorite shower, an increase in the rate of terrestrial meteorite impacts attributed to the breakup of the L\u2010chondrite parent body in the main asteroid belt.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Charles C. Monson, Dustin Sweet, Branimir Segvic, Giovanni Zanoni, Kyle Balling, Jacalyn M. Wittmer, G. Robert Ganis, Guo Cheng Meteoritics &amp; Planetary Science First Published: 15 October 2019 LINK &#8220;The Glasford structure in Illinois (USA)&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3177,90,23,7,337],"tags":[5218,944,490,2370,3548,321,1266],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20561"}],"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=20561"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20561\/revisions"}],"predecessor-version":[{"id":20562,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20561\/revisions\/20562"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}