LINK<\/strong><\/a><\/p>\n\n\n\n“We performed a petrologic, geochemical, and oxygen isotopic study of the lowest FeO ordinary chondrite (OC), Yamato (Y) 982717. Y 982717 shows a chondritic texture composed of chondrules and chondrule fragments, and mineral fragments set in a finer grained, clastic matrix, similar to H4 chondrites. The composition of olivine (Fa11.17 \u00b1 0.48 (1\u03c3)) and low\u2010Ca pyroxene (Fs11.07 \u00b1 0.98 (1\u03c3)Wo0.90 \u00b1 0.71(1\u03c3)) is significantly more magnesian than those of typical H chondrites (Fa16.0\u201020, Fs14.5\u201018.0), as well as other known low\u2010FeO OCs (Fa12.8\u201016.7; Fs13\u201016). However, the bulk chemical composition of Y 982717, in particular lithophile and moderately volatile elements, is within the range of OCs. The bulk siderophile element composition (Ni, Co) is within the range of H chondrites and distinguishable from L chondrites. The O\u2010isotopic composition is also within the range of H chondrites. The lack of reduction textures indicates that the low olivine Fa content and low\u2010Ca pyroxene Fs content are characteristics of the precursor materials, rather than the result of reduction during thermal metamorphism. We suggest that the H chondrites are more compositionally diverse than has been previously recognized.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Akira Yamaguchi, Makoto Kimura, Jean\u2010Alix Barrat, Richard Greenwood Meteoritics & Planetary Science First Published: 10 July 2019 LINK “We performed a petrologic, geochemical, and oxygen isotopic study of the lowest FeO ordinary chondrite (OC), Yamato…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56,6,58,7,577],"tags":[1657,4852,1807,5087],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20044"}],"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=20044"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20044\/revisions"}],"predecessor-version":[{"id":20045,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20044\/revisions\/20045"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}