{"id":29432,"date":"2021-11-02T20:11:19","date_gmt":"2021-11-02T18:11:19","guid":{"rendered":"https:\/\/karmaka.de\/?p=29432"},"modified":"2021-11-02T20:11:21","modified_gmt":"2021-11-02T18:11:21","slug":"widespread-glasses-generated-by-cometary-fireballs-during-the-late-pleistocene-in-the-atacama-desert-chile","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=29432","title":{"rendered":"Widespread glasses generated by cometary fireballs during the late Pleistocene in the Atacama Desert, Chile<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Peter H. Schultz, R. Scott Harris, Sebasti\u00e1n Perroud, Nicolas Blanco, Andrew J. Tomlinson<\/p>\n\n\n\n<p>Geology (2021)<br>November 02, 2021<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/pubs.geoscienceworld.org\/gsa\/geology\/article\/doi\/10.1130\/G49426.1\/609354\/Widespread-glasses-generated-by-cometary-fireballs\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Twisted and folded silicate glasses (up to 50 cm across) concentrated in certain areas across the Atacama Desert near Pica (northern Chile) indicate nearly simultaneous (seconds to minutes) intense airbursts close to Earth\u2019s surface near the end of the Pleistocene. The evidence includes mineral decompositions that require ultrahigh temperatures, dynamic modes of emplacement for the glasses, and entrained meteoritic dust. Thousands of identical meteoritic grains trapped in these glasses show compositions and assemblages that resemble those found exclusively in comets and CI group primitive chondrites. Combined with the broad distribution of the glasses, the Pica glasses provide the first clear evidence for a cometary body (or bodies) exploding at a low altitude. This occurred soon after the arrival of proto-Archaic hunter-gatherers and around the time of rapid climate change in the Southern Hemisphere.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Peter H. Schultz, R. Scott Harris, Sebasti\u00e1n Perroud, Nicolas Blanco, Andrew J. Tomlinson Geology (2021)November 02, 2021 LINK (OPEN ACCESS) &#8220;Twisted and folded silicate glasses (up to 50 cm across) concentrated in certain areas across&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,10,3249,179,96],"tags":[339,118,3273,1809,1870,1162,5834,141,680,6154,902],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29432"}],"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=29432"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29432\/revisions"}],"predecessor-version":[{"id":29434,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29432\/revisions\/29434"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29432"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}