LINK<\/strong><\/a><\/p>\n“Magnesium isotopic compositions of 22 well-characterized differentiated meteorites including 7 types of achondrites and pallasite meteorites were measured to estimate the average Mg isotopic composition of their parent bodies and evaluate Mg isotopic heterogeneity of the solar system. The \u03b426Mg values are -0.236\u2030 and -0.190\u2030 for acapulcoite-lodranite and angrite meteorites, respectively and vary from -0.267\u2030 to -0.222\u2030 in the winonaite-IAB-iron silicate group, -0.369\u2030 to -0.292\u2030 in aubrites, -0.269\u2030 to -0.158\u2030 in HEDs, -0.299\u2030 to -0.209\u2030 in ureilites, -0.307\u2030 to -0.237\u2030 in mesosiderites, and -0.303\u2030 to -0.238\u2030 in pallasites. Magnesium isotopic compositions of most achondrites and pallasite meteorites analyzed here are similar and reveal no significant isotopic fractionation. However, Mg isotopic compositions of D\u2032Orbigny (angrite) and some HEDs are slightly heavier than chondrites and the other achondrites studied here. The slightly heavier Mg isotopic compositions of angrites and some HEDs most likely resulted from either impact-induced evaporation or higher abundance of clinopyroxene with the Mg isotopic composition slightly heavier than olivine and orthopyroxene. The average Mg isotopic composition of achondrites (\u03b426Mg = -0.246 \u00b1 0.082\u2030, 2SD, n = 22) estimated here is indistinguishable from those of the Earth (\u03b426Mg = -0.25 \u00b1 0.07\u2030; 2SD, n = 139), chondrites (\u03b426Mg = -0.28 \u00b1 0.06\u2030; 2SD, n = 38), and the Moon (\u03b426Mg = -0.26 \u00b1 0.16\u2030) reported from the same laboratory. The chondritic Mg isotopic composition of achondrites, the Moon, and the Earth further reflects homogeneity of Mg isotopes in the solar system and the lack of Mg isotope fractionation during the planetary accretion process and impact events.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Fatemeh Sedaghatpour, Fang-Zhen Teng Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 2 December 2015 doi:10.1016\/j.gca.2015.11.016 LINK “Magnesium isotopic compositions of 22 well-characterized differentiated meteorites including 7 types of achondrites and pallasite meteorites…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30,28,37,38,33,31,810,32],"tags":[2229,1819,2228,2227],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6307"}],"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=6307"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6307\/revisions"}],"predecessor-version":[{"id":6309,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6307\/revisions\/6309"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}