LINK<\/strong><\/a><\/p>\n“The meteorites Graves Nunataks (GRA) 06128 and 06129, however, are igneous meteorites dominated by oligoclase feldspar and have a basaltic trachyandesite-like whole rock composition. Formation of the GRA 06128\/9 meteorites as primary melts on an oxidized planetesimal has been previously proposed (, , ; ). We show experimentally that anhydrous partial melting of an oxidized R chondrite at IW to IW+1 between 1120-1140\u00b0C produces melts of GRA 06128\/9-like compositions: intermediate SiO2 and FeO concentrations that are enriched in volatile sodium. From a process perspective, GRA 06128\/9-like magmas are complementary to partial melt residues such as olivine-rich brachinite and FeO-rich brachinite-like meteorites. Magmas of GRA 06128\/9\u2019s composition can be generated under equilibrium conditions, as demonstrated by MELTS modeling, but only at temperatures \u223c1140\u00b0C. At lower degrees of partial melting liquids formed under equilibrium and non-equilibrium conditions follow distinct compositional pathways to reach GRA 06128\/9-like melts. For lower degrees of melting, the non-equilibrium trend more closely resembles GRA 06128\/9\u2019s composition. Phase abundance modeling indicates that GRA 06128\/9-composition magmas form by 14-22% silicate melting of an oxidized R-chondrite. We conclude that GRA 06128\/9-composition magmas can be generated at \u223c1140\u00b0C from partial melting of an oxidized chondritic precursor under both non-equilibrium and equilibrium conditions.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Nicole G. Lunning, Kathryn G. Gardner-Vandy, Emma S. Sosa, Timothy J. Mccoy, Emma S. Bullock, Catherine M. Corrigan Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 11 July 2017 LINK “The meteorites Graves…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,27,507],"tags":[864,1153,970,3129,2285],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13317"}],"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=13317"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13317\/revisions"}],"predecessor-version":[{"id":13318,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/13317\/revisions\/13318"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13317"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}