{"id":343,"date":"2014-08-14T17:56:20","date_gmt":"2014-08-14T15:56:20","guid":{"rendered":"http:\/\/karmaka.de\/?p=343"},"modified":"2014-11-09T16:08:55","modified_gmt":"2014-11-09T15:08:55","slug":"cosmic-ray-exposure-and-pre-atmospheric-size-of-the-gebel-kamil-iron-meteorite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=343","title":{"rendered":"Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite"},"content":{"rendered":"<p>Ott, U., Merchel, S., Herrmann, S., Pavetich, S., Rugel, G., Faestermann, T., Fimiani, L., Gomez-Guzman, J. M., Hain, K., Korschinek, G., Ludwig, P., D&#8217;Orazio, M. and Folco, L. (2014)<\/p>\n<p>Meteoritics &amp; Planetary Science. doi: 10.1111\/maps.12334<\/p>\n<p><a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.12334\/abstract\"><strong>LINK<\/strong><\/a><\/p>\n<blockquote><p>Abstract<\/p>\n<p>Cosmogenic He, Ne, and Ar as well as the radionuclides 10Be, 26Al, 36Cl, 41Ca, 53Mn, and 60Fe have been determined on samples from the Gebel Kamil ungrouped Ni-rich iron meteorite by noble gas mass spectrometry and accelerator mass spectrometry (AMS), respectively. The meteorite is associated with the Kamil crater in southern Egypt, which is about 45 m in diameter. Samples originate from an individual large fragment (\u201cIndividual\u201d) as well as from shrapnel. Concentrations of all cosmogenic nuclides\u2014stable and radioactive\u2014are lower by a factor 3\u20134 in the shrapnel samples than in the Individual. Assuming negligible 36Cl decay during terrestrial residence (indicated by the young crater age &lt;5000 years; Folco et al. 2011), data are consistent with a simple exposure history and a 36Cl-36Ar cosmic ray exposure age (CRE) of approximately (366 \u00b1 18) Ma (systematic errors not included). Both noble gases and radionuclides point to a pre-atmospheric radius &gt;85 cm, i.e., a pre-atmospheric mass &gt;20 tons, with a preferred radius of 115\u2013120 cm (50\u201360 tons). The analyzed samples came from a depth of approximately 20 cm (Individual) and approximately 50\u201380 cm (shrapnel). The size of the Gebel Kamil meteoroid determined in this work is close to estimates based on impact cratering models combined with expectations for ablation during passage through the atmosphere (Folco et al. 2010, 2011).<\/p>\n<div id=\"fulltext\"><\/div>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Ott, U., Merchel, S., Herrmann, S., Pavetich, S., Rugel, G., Faestermann, T., Fimiani, L., Gomez-Guzman, J. M., Hain, K., Korschinek, G., Ludwig, P., D&#8217;Orazio, M. and Folco, L. (2014) Meteoritics &amp; Planetary Science. doi: 10.1111\/maps.12334&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[214,8,506,140],"tags":[95,217,215,216],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/343"}],"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=343"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/343\/revisions"}],"predecessor-version":[{"id":344,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/343\/revisions\/344"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}