LINK<\/strong><\/a><\/p>\n“In order to better understand the formation and evolution of their parent bodies, the three isotope ratios of sulfur were analyzed in 33 enstatite meteorites (24 enstatite chondrites and 9 aubrites). The results show that on average all enstatite chondrite groups are enriched in the lightest isotopes compared to other chondrite groups, with means of \u03b434S of -0.28 \u00b1 0.22 \u2030 for EH3\/4, -0.16 \u00b1 0.16 \u2030 for EH5, -0.32 \u00b1 0.15 \u2030 for EL3, -0.67 \u00b1 0.16 \u2030 for EL6 and -0.64 \u00b1 0.00 \u2030 for EL7 (all 1\u03c3). Aubrites show a larger isotope variability in their composition, with a \u03b434S varying from -1.350\u2030 to +0.154 \u2030. Contrary to previously published results, our data show a distinct composition for EL6 compared to other enstatite chondrites. This could be related to an impact-induced loss of isotopically heavy oldhamite (\u03b434S = by 3.62 \u00b1 3.02 \u2030 (1\u03c3)) on the EL parent body. Although the bulk sulfur in both enstatite meteorites and aubrites does not show any significant \u039433S and \u039436S, the oldhamite fraction shows clear evidence of mass independent fractionation on the 36S\/32S ratio (in 3 out of 9 analyzes, \u039436S up to +2.2\u2030), a signal that is not correlated to any 33S\/32S anomaly (in 1 out of 9 analyzes, \u039433S down to -0.085\u2030). Though a nebular or photochemical origin cannot be ruled out, the most plausible mechanism to produce such isolated non-mass dependent 36S\/32S anomalies would be a contribution of FeCl2 containing excesses of 36S due to the decay of 36Cl to the leached oldhamite fraction. Even though the sulfur isotopic composition measured in enstatite meteorites is distinct from the Bulk Silicate Earth (BSE), the isotopically lightest samples of EL6, EL7 and aubrites are approaching the isotopic composition of the BSE and enstatite meteorites remain the meteorites with the sulfur isotopic composition the closest to the terrestrial one.”<\/p>\n","protected":false},"excerpt":{"rendered":"
C. Defouilloy, P. Cartigny, N. Assayag, F. Moynier, J.-A. Barrat Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 19 October 2015 doi:10.1016\/j.gca.2015.10.009 LINK “In order to better understand the formation and evolution of…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38,25,26,17],"tags":[1813,2117,2118],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6024"}],"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=6024"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6024\/revisions"}],"predecessor-version":[{"id":6026,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/6024\/revisions\/6026"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}