{"id":8948,"date":"2016-06-14T17:43:21","date_gmt":"2016-06-14T15:43:21","guid":{"rendered":"http:\/\/karmaka.de\/?p=8948"},"modified":"2016-06-28T19:13:48","modified_gmt":"2016-06-28T17:13:48","slug":"a-new-type-of-solar-system-material-recovered-from-ordovician-marine-limestone","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=8948","title":{"rendered":"A new type of solar-system material recovered from Ordovician marine limestone<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>B. Schmitz, Q. -Z. Yin, M. E. Sanborn,M. Tassinari,C. E. Caplan &amp; G. R. Huss<\/p>\n<p>Nature Communications 7,<br \/>\nArticle number:ncomms11851<br \/>\ndoi:10.1038\/ncomms11851<br \/>\nPublished 14 June 2016<\/p>\n<p><a href=\"http:\/\/www.nature.com\/ncomms\/2016\/160614\/ncomms11851\/full\/ncomms11851.html\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"http:\/\/www.nature.com\/ncomms\/2016\/160614\/ncomms11851\/pdf\/ncomms11851.pdf\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;From mid-Ordovician ~470\u2009Myr-old limestone &gt;100 fossil L-chondritic meteorites have been recovered, representing the markedly enhanced flux of meteorites to Earth following the breakup of the L-chondrite parent body. Recently one anomalous meteorite, \u00d6sterplana 065 (\u00d6st 65), was found in the same beds that yield L chondrites. The cosmic-ray exposure age of \u00d6st 65 shows that it may be a fragment of the impactor that broke up the L-chondrite parent body. Here we show that in a chromium versus oxygen-isotope plot \u00d6st 65 falls outside all fields encompassing the known meteorite types. This may be the first documented example of an \u2018extinct\u2019 meteorite, that is, a meteorite type that does not fall on Earth today because its parent body has been consumed by collisions. The meteorites found on Earth today apparently do not give a full representation of the kind of bodies in the asteroid belt ~500\u2009Myr ago.&#8221;<\/p>\n<div style=\"width: 956px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.nature.com\/ncomms\/2016\/160614\/ncomms11851\/images\/ncomms11851-f1.jpg\" width=\"946\" height=\"770\" \/><p class=\"wp-caption-text\">The meteorite is 8 \u00d7 6.5 \u00d7 2\u2009cm large. It is surrounded by a grey reduction halo, in the otherwise red limestone. Oxygen was consumed when the meteorite weathered on the sea floor. The coin in the image has a diameter of 2.5\u2009cm.<\/p><\/div>\n<div style=\"width: 956px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.nature.com\/ncomms\/2016\/160614\/ncomms11851\/images\/ncomms11851-f3.jpg\" width=\"946\" height=\"688\" \/><p class=\"wp-caption-text\">Comparison of \u039417O versus \u03b554Cr of achondrites, and ordinary chondrites fallen on Earth in recent time with \u00d6sterplana 065 (\u00d6st 65) and fossil L-chondritic meteorites \u00d6sterplana 018, 029 and 032 (\u00d6st 18, \u00d6st 29 and \u00d6st 32 in figure). The fields for ordinary chondrites (OC), Mars (SNCs), Earth and earth-likes, Vesta (HEDs), brachinites, ureilites, winonaites (win), acapulcoites (acp)\/lodranites\/ungrouped achondrites (ung) and a newly identified unique metal-rich chondrite are marked with select representative samples with available data. Symbol colours indicate meteorite type or grouping. Note that the carbonaceous chondrites and affiliated achondrites plot outside the field, with highly positive \u03b554Cr.<\/p><\/div>\n<div style=\"width: 956px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.nature.com\/ncomms\/2016\/160614\/ncomms11851\/images\/ncomms11851-f4.jpg\" width=\"946\" height=\"2145\" \/><p class=\"wp-caption-text\">(a) Chrome-spinel grain with inclusion of a TiCr-mineral, possibly olkhonskite (TiO2=56\u2009wt%, Cr2O3=30\u2009wt%, FeO=9\u2009wt%). (b) Rutile and chrome spinel in polished section of \u00d6st 65. (c) Chrome-spinel grain with apparent shock deformation lamellae. Scale bars, 50\u2009\u03bcm.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>B. Schmitz, Q. -Z. Yin, M. E. Sanborn,M. Tassinari,C. E. Caplan &amp; G. R. Huss Nature Communications 7, Article number:ncomms11851 doi:10.1038\/ncomms11851 Published 14 June 2016 LINK (OPEN ACCESS) PDF (OPEN ACCESS) &#8220;From mid-Ordovician ~470\u2009Myr-old limestone&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,951],"tags":[2891,2457,321,2890],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/8948"}],"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=8948"}],"version-history":[{"count":6,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/8948\/revisions"}],"predecessor-version":[{"id":8954,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/8948\/revisions\/8954"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}