{"id":14610,"date":"2017-12-11T23:40:31","date_gmt":"2017-12-11T22:40:31","guid":{"rendered":"http:\/\/karmaka.de\/?p=14610"},"modified":"2018-04-08T00:02:40","modified_gmt":"2018-04-07T23:02:40","slug":"oxygen-isotope-reservoirs-in-the-outer-asteroid-belt-inferred-from-oxygen-isotope-systematics-of-chondrule-olivines-and-isolated-forsterite-and-olivine-grains-in-tagish-lake-type-carbonaceous-chondrit","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=14610","title":{"rendered":"Oxygen isotope reservoirs in the outer asteroid belt inferred from oxygen isotope systematics of chondrule olivines and isolated forsterite and olivine grains in Tagish Lake-type carbonaceous chondrites, WIS 91600 and MET 00432<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Masakuni Yamanobe, Tomoki Nakamura, Daisuke Nakashima<\/p>\n<p>Polar Science<br \/>\nVolume 15, March 2018, Pages 29-38<\/p>\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1873965217300853\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1873965217300853\/pdfft?md5=df85c7f284e71e33eb232ae39a6f4850&#038;pid=1-s2.0-S1873965217300853-main.pdf\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;To understand oxygen isotope ratios and redox conditions of the chondrule formation environments of the outer rigions of the asteroid belt, we analyzed major element concentrations and oxygen isotope ratios of olivine grains in chondrules, isolated forsterite, and isolated olivine from the WIS 91600 and MET 00432 carbonaceous chondrites, which are thought to have originated from D-type asteroids located in the outer asteroid belt. The oxygen isotope ratios of individual chondrules and isolated grains show a wide variation in \u03b418O from \u22129.9\u2030 to +9.1\u2030 along the carbonaceous chondrite anhydrous mineral (CCAM) and primitive chondrule mineral (PCM) lines. The \u039417O (= \u03b417O \u2013 0.52 \u00d7 \u03b418O) values of the measured objects increase with decreasing Mg#; i.e., FeO-poor objects (Mg# > 90; type I chondrules and isolated forsterites) mainly have \u039417O values of ca. \u22126\u2030, and FeO-rich objects (Mg# < 90; type II chondrules and isolated olivines) have \u039417O values ranging from \u22123\u2030 to +2\u2030. Similar trends are observed for ferromagnesian silicate particles from comet Wild2 and CR chondrite chondrules, particularly in terms of FeO-rich objects with \u039417O values ranging from \u22123\u2030 to +2\u2030. It is suggested that FeO-rich objects formed in the outer regions of the asteroid belt and were transported to the outer solar nebular regions where comet Wild2 formed.\"\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Masakuni Yamanobe, Tomoki Nakamura, Daisuke Nakashima Polar Science Volume 15, March 2018, Pages 29-38 LINK (OPEN ACCESS) PDF (OPEN ACCESS) &#8220;To understand oxygen isotope ratios and redox conditions of the chondrule formation environments of the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,9,56,18,3424,65,335],"tags":[945,4458,2940,463,1581],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14610"}],"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=14610"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14610\/revisions"}],"predecessor-version":[{"id":14611,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14610\/revisions\/14611"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14610"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14610"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}