FN Archimer Export Format PT J TI Early stages of core segregation recorded by Fe isotopes in an asteroidal mantle BT AF BARRAT, Jean-Alix ROUXEL, Olivier WANG, K. MOYNIER, F. YAMAGUCHI, A. BISCHOFF, A. LANGLADE, Jessica AS 1:1;2:2;3:3;4:4,5;5:6,7;6:8;7:9; FF 1:;2:PDG-REM-GM-LGM;3:;4:;5:;6:;7:; C1 Univ Bretagne Occidentale, CNRS, UMR 6538, Inst Univ Europeen Mer, F-29280 Plouzane, France. IFREMER, Ctr Brest, F-29280 Plouzane, France. Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA. Univ Paris Diderot, Inst Univ France, Inst Phys Globe Paris, Sorbonne Paris Cite, F-75238 Paris 05, France. Inst Univ France, Paris, France. Natl Inst Polar Res, Tachikawa, Tokyo 1908518, Japan. Grad Univ Adv Sci, Sch Multidisciplinary Sci, Dept Polar Sci, Tachikawa, Tokyo 1908518, Japan. Univ Munster, Inst Planetol, D-48149 Munster, Germany. CNRS, UMS 3113, IUEM, F-29280 Plouzane, France. C2 UBO, FRANCE IFREMER, FRANCE UNIV HARVARD, USA UNIV PARIS 07, FRANCE INST UNIV FRANCE, FRANCE NATL INST POLAR RES, JAPAN UNIV GRAD ADV STUDIES, JAPAN UNIV MUNSTER, GERMANY CNRS, FRANCE SI BREST SE PDG-REM-GM-LGM UM LGO IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe IF 4.326 TC 45 UR https://archimer.ifremer.fr/doc/00256/36747/88181.pdf LA English DT Article DE ;iron isotopes;achondrite;ureilite;core AB Ureilite meteorites are achondrites that are debris of the mantle of a now disrupted differentiated asteroid rich in carbon. They provide a unique opportunity to study the differentiation processes of such a body. We analyzed the iron isotopic compositions of 30 samples from the Ureilite Parent Body (UPB) including 29 unbrecciated ureilites and one ureilitic trachyandesite (ALM-A) which is at present the sole large crustal sample of the UPB. The δ56Fe of the whole rocks fall within a restricted range, from 0.01 to 0.11‰, with an average of +0.056±0.008‰+0.056±0.008‰, which is significantly higher than that of chondrites. We show that this difference can be ascribed to the segregation of S-rich metallic melts at low degrees of melting at a temperature close to the Fe–FeS eutectic, and certainly before the onset of the melting of the silicates (View the MathML source<1100°C), in agreement with the marked S depletions, and the siderophile element abundances of the ureilites. These results point to an efficient segregation of S-rich metallic melts during the differentiation of small terrestrial bodies. PY 2015 PD JUL SO Earth And Planetary Science Letters SN 0012-821X PU Elsevier Science Bv VL 419 UT 000353852500009 BP 93 EP 100 DI 10.1016/j.epsl.2015.03.026 ID 36747 ER EF