FN Archimer Export Format PT J TI Sr‐Nd‐Hf isotopes along the Pacific Antarctic Ridge from 41 to 53°S BT AF HAMELIN, Cedric DOSSO, Laure HANAN, Barry BARRAT, Jean-Alix ONDREAS, Helene AS 1:1;2:2;3:3;4:1;5:2; FF 1:;2:;3:;4:;5:PDG-DOP-DCB-GM-LGM; C1 UBO, IUEM, Lab Domaines Ocean, UMR 6538, F-29280 Plouzane, France. IFREMER, CNRS, UMR 6538, Lab Domaines Ocean, F-29280 Plouzane, France. San Diego State Univ, San Diego, CA 92182 USA. C2 UBO, FRANCE IFREMER, FRANCE UNIV SAN DIEGO STATE, USA SI BREST SE PDG-DOP-DCB-GM-LGM IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france copubli-int-hors-europe IF 3.505 TC 18 TU Centre national de la recherche scientifique Institut National de l'Information Géographique et Forestière Institut de physique du globe Institut de recherche pour le développement Institut français de recherche pour l'exploitation de la mer Service Hydrographique et Océanographique de la Marine Université Paris Diderot Université Pierre et Marie Curie Université de Bretagne Occidentale Université de Bretagne-Sud Université de La Réunion UR https://archimer.ifremer.fr/doc/00004/11526/8123.pdf LA English DT Article CR PACANTARCTIC PACANTARCTIC 2 BO L'Atalante DE ;Pacific-Antarctic;depleted mantle;Sr-Nd-Hf isotopes AB Major, trace element and Sr-Nd-Hf isotope data in basalts collected along the Pacific-Antarctic Ridge ( PAR) axis between 53 and 41 S, far from any hotspot influence, reveal tight coherent geochemical variations within the depleted MORB mantle. All samples are located below the Pacific reference line defining two sub-oceanic mantle domains on each side of the Easter microplate. The data extend the PAR 66-53 S field towards more radiogenic Sr (0.70264), less radiogenic Nd (epsilon = 7.7) and Hf (epsilon = 11.4) values. The along ridge geochemical variability is closely related to the morphological segmentation of the ridge. Anomalous geochemical features are attributed to the atypical morphology of two segments due to the presence of off-axis magmatism. The first order ridge discontinuity defined by the Menard transform fault separates two slightly different mantle domains, each with its own history. PY 2010 PD MAY SO Geophysical Research Letters SN 0094-8276 PU American Geophysical Union VL 37 IS L10303 UT 000277963200003 BP 1 EP 5 DI 10.1029/2010GL042979 ID 11526 ER EF