{"id":14409,"date":"2018-03-12T06:48:42","date_gmt":"2018-03-12T05:48:42","guid":{"rendered":"http:\/\/karmaka.de\/?p=14409"},"modified":"2018-03-22T22:19:58","modified_gmt":"2018-03-22T21:19:58","slug":"cosmic-history-and-a-candidate-parent-asteroid-for-the-quasicrystal-bearing-meteorite-khatyrka","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=14409","title":{"rendered":"Cosmic History and a Candidate Parent Asteroid for the Quasicrystal-bearing Meteorite Khatyrka<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Matthias M.M. Meier, Luca Bindi, Philipp R. Heck, April I. Neander, Nicole H. Spring, My E. I. Riebe, Colin Maden, Heinrich Baur, Paul J. Steinhardt, Rainer Wieler, Henner Busemann<\/p>\n<p>Submitted to Earth and Planetary Science Letters <\/p>\n<p><a href=\"https:\/\/arxiv.org\/pdf\/1803.03513\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p><strong>Update (22 March 2018)<\/strong>: <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0012821X1830147X\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n<p>Earth and Planetary Science Letters<br \/>\nVolume 490, 15 May 2018, Pages 122\u2013131<\/p>\n<p>&#8220;Highlights<\/p>\n<p>\u2022 We measured He and Ne in olivine-rich grains from the CV chondrite Khatyrka.<br \/>\n\u2022 We find a short cosmic-ray exposure age of a few million years.<br \/>\n\u2022 The meteorite experienced a relatively recent (\u223c600 Ma) shock event.<br \/>\n\u2022 Khatyrka might be a fragment of the young Julia asteroid family.&#8221;<\/p>\n<p>&#8220;The unique CV-type meteorite Khatyrka is the only natural sample in which &#8220;quasicrystals&#8221; and associated crystalline Cu,Al-alloys, including khatyrkite and cupalite, have been found. They are suspected to have formed in the early Solar System. To better understand the origin of these exotic phases, and the relationship of Khatyrka to other CV chondrites, we have measured He and Ne in six individual, ~40-{\\mu}m-sized olivine grains from Khatyrka. We find a cosmic-ray exposure age of about 2-4 Ma (if the meteoroid was <3 m in diameter, more if it was larger). The U,Th-He ages of the olivine grains suggest that Khatyrka experienced a relatively recent (<600 Ma) shock event, which created pressure and temperature conditions sufficient to form both the quasicrystals and the high-pressure phases found in the meteorite. We propose that the parent body of Khatyrka is the large K-type asteroid 89 Julia, based on its peculiar, but matching reflectance spectrum, evidence for an impact\/shock event within the last few 100 Ma (which formed the Julia family), and its location close to strong orbital resonances, so that the Khatyrka meteoroid could plausibly have reached Earth within its rather short cosmic-ray exposure age.\"\n\n\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ars.els-cdn.com\/content\/image\/1-s2.0-S0012821X1830147X-gr001.jpg\" width=\"500\" height=\"194\" class=\"alignnone size-full\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Matthias M.M. Meier, Luca Bindi, Philipp R. Heck, April I. Neander, Nicole H. Spring, My E. I. Riebe, Colin Maden, Heinrich Baur, Paul J. Steinhardt, Rainer Wieler, Henner Busemann Submitted to Earth and Planetary Science&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,69,14,127],"tags":[4406,1812,698,1859,1157],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14409"}],"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=14409"}],"version-history":[{"count":5,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14409\/revisions"}],"predecessor-version":[{"id":14507,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14409\/revisions\/14507"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}