{"id":1657,"date":"2014-03-04T23:28:50","date_gmt":"2014-03-04T22:28:50","guid":{"rendered":"http:\/\/karmaka.de\/?p=1657"},"modified":"2014-11-06T23:31:00","modified_gmt":"2014-11-06T22:31:00","slug":"petrology-and-bulk-chemistry-of-yamato-82094-a-new-type-of-carbonaceous-chondrite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=1657","title":{"rendered":"Petrology and bulk chemistry of Yamato-82094, a new type of carbonaceous chondrite"},"content":{"rendered":"<p>Kimura M, Barrat JA, Weisberg MK, Imae N, Yamaguchi A and Kojima H (in press) <\/p>\n<p>Meteoritics &#038; Planetary Science<br \/>\nVolume 49, Issue 3, pages 346\u2013357, March 2014<\/p>\n<p><a href=\"onlinelibrary.wiley.com\/doi\/10.1111\/maps.12254\/abstract\"_blank\"><strong>HERE<\/strong><\/a><\/p>\n<blockquote><p>Carbonaceous chondrites are classified into several groups. However, some are ungrouped. We studied one such ungrouped chondrite, Y-82094, previously classified as a CO. In this chondrite, chondrules occupy 78 vol%, and the matrix is distinctly poor in abundance (11 vol%), compared with CO and other C chondrites. The average chondrule size is 0.33 mm, different from that in C chondrites. Although these features are similar to those in ordinary chondrites, Y-82094 contains 3 vol% Ca-Al-rich inclusions and 5% amoeboid olivine aggregates (AOAs). Also, the bulk composition resembles that of CO chondrites, except for the volatile elements, which are highly depleted. The oxygen isotopic composition of Y-82094 is within the range of CO and CV chondrites. Therefore, Y-82094 is an ungrouped C chondrite, not similar to any other C chondrite previously reported. Thin FeO-rich rims on AOA olivine and the mode of occurrence of Ni-rich metal in the chondrules indicate that Y-82094 is petrologic type 3.2. The extremely low abundance of type II chondrules and high abundance of Fe-Ni metal in the chondrules suggest reducing condition during chondrule formation. The depletion of volatile elements indicates that the components formed under high-temperature conditions, and accreted to the parent body of Y-82094. Our study suggests a wider range of formation conditions than currently recorded by the major C chondrite groups. Additionally, Y-82094 may represent a new, previously unsampled, asteroidal body.<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Kimura M, Barrat JA, Weisberg MK, Imae N, Yamaguchi A and Kojima H (in press) Meteoritics &#038; Planetary Science Volume 49, Issue 3, pages 346\u2013357, March 2014<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,335],"tags":[106,1862,527],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/1657"}],"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=1657"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/1657\/revisions"}],"predecessor-version":[{"id":1658,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/1657\/revisions\/1658"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}