LINK<\/strong><\/a><\/p>\n\n\n\n“The isotope anomalies of noncarbonaceous (NC) and carbonaceous (CC) extraterrestrial materials provide a framework for tracing the distribution and accretion of matter in the early solar system. Here, we extend this framework to sulfur (S)\u2014one of six \u201clife-essential\u201d volatile elements [TC ~ 664 K]\u2014via the mass-independent S-isotope compositions of differentiated meteorites. We observe that on average, NC and CC iron meteorites are characterized by distinct \u039433S (\u039433SNC = 0.013 \u00b1 0.003\u2030; \u039433SCC = \u22120.021 \u00b1 0.009\u2030; 2 SE). The average \u039436S of NC and CC irons are less well resolved (\u039436SNC = \u22120.006 \u00b1 0.039\u2030; \u039436SCC = \u22120.101 \u00b1 0.114\u2030; 2 SE), but the \u039436S values of the CC irons are concentrated in the lower half of the range of those observed for iron meteorites. A lack of CC achondrite S-isotope analyses prevents direct comparison of the \u039433S and \u039436S of NC and CC achondrites, but the average \u039433S and \u039436S of NC achondrites (\u039433S = 0.02 \u00b1 0.008; \u039436S = \u22120.019 \u00b1 0.064\u2030; 2 SE) overlap with those of the NC irons. The average \u039433S values of NC achondrite groups also correlate with nucleosynthetic anomalies of other elements (e.g., Cr) previously used to define isotopic heterogeneity within the NC reservoir. The position of the Earth in \u039433S-\u039436S composition space implies that ~24% of terrestrial S derives from CC materials, while the majority (~76%) was delivered by NC materials.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Elizabeth A. Heiny, Edward M. Stolper, and John M. Eiler PNAS, May 2, 2025, 122 (18) e2418198122 LINK “The isotope anomalies of noncarbonaceous (NC) and carbonaceous (CC) extraterrestrial materials provide a framework for tracing the…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112,214,73],"tags":[993,6862,2337,4454,3152,4453,4857,317,2118,1088],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38187"}],"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=38187"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38187\/revisions"}],"predecessor-version":[{"id":38188,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38187\/revisions\/38188"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}