{"id":42407,"date":"2026-08-10T16:36:52","date_gmt":"2026-08-10T14:36:52","guid":{"rendered":"https:\/\/karmaka.de\/?p=42407"},"modified":"2026-08-10T16:36:53","modified_gmt":"2026-08-10T14:36:53","slug":"description-and-terrestrial-ages-of-the-calama-area-meteorite-collection-atacama-desert-chile","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=42407","title":{"rendered":"Description and terrestrial ages of the Calama Area Meteorite Collection (Atacama Desert, Chile)<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Carine Sadaka, J\u00e9r\u00f4me Gattacceca, Florian Dumas, R\u00e9gis Braucher, ASTER Team , Matthieu Gounelle, Dilyara Kuzina, Cyril Lorenz, Alexandre Corgne, Pierre Semp\u00e9r\u00e9<\/p>\n\n\n\n<p>MAPS, Version of Record online: 10 August 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.70219\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.70219\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;We present a comprehensive study of a meteorite collection from the Atacama Desert (Chile), the driest and most climatically stable desert in the world. This collection includes meteorites from three adjacent Dense Collection Areas (DCAs) in the northern part of the Atacama Desert: Calama, Sierra Gorda, and Chug Chug, referred to as the \u201cCalama area.\u201d Within this region (~550\u2009km2), we conducted a systematic search over a 2.5\u2009km2 zone in the Calama DCA and compared the resulting density to the nonsystematic recovery density in the Calama area. We also present the 36Cl-based terrestrial ages of 49 ordinary chondrites selected from the Calama area. The systematic search yielded a meteorite recovery density of 38 meteorites per km2 (15 meteorites per km2 for meteorites &gt;20\u2009g), and the collection exhibits a median terrestrial age of 303\u2009ka. Notably, compared with the El M\u00e9dano and Catalina DCAs, the Calama area is characterized by a lower meteorite density and younger meteorite terrestrial ages, most likely reflecting the region&#8217;s more humid climate and more dynamic geomorphology due to its proximity to the pre-Andean range. Our results further show that meteorite weathering is not correlated with terrestrial age but is instead essentially controlled by the initial porosity of the meteorite, itself related to shock stage. Nevertheless, the Calama area still exhibits higher densities and older terrestrial ages than any other hot desert in the world, confirming that the long-term preservation of meteorites is observed across the entire Atacama Desert.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Carine Sadaka, J\u00e9r\u00f4me Gattacceca, Florian Dumas, R\u00e9gis Braucher, ASTER Team , Matthieu Gounelle, Dilyara Kuzina, Cyril Lorenz, Alexandre Corgne, Pierre Semp\u00e9r\u00e9 MAPS, Version of Record online: 10 August 2026 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;We&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,70,64],"tags":[464,2522,7284,7285,2524,2622,7283,2414],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42407"}],"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=42407"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42407\/revisions"}],"predecessor-version":[{"id":42408,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/42407\/revisions\/42408"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}