Sr‐Nd‐Hf isotopes along the Pacific Antarctic Ridge from 41 to 53°S

Type Article
Date 2010-05-19
Language English
Author(s) Hamelin Cedric1, Dosso Laure2, Hanan Barry3, Barrat Jean-Alix1, Ondreas Helene2
Affiliation(s) 1 : UBO, IUEM, Lab Domaines Ocean, UMR 6538, F-29280 Plouzane, France.
2 : IFREMER, CNRS, UMR 6538, Lab Domaines Ocean, F-29280 Plouzane, France.
3 : San Diego State Univ, San Diego, CA 92182 USA.
Source Geophysical Research Letters (0094-8276) (American Geophysical Union), 2010-05-19 , Vol. 37 , N. L10303 , P. 1-5
DOI 10.1029/2010GL042979
WOS© Times Cited 18
Keyword(s) Pacific-Antarctic, depleted mantle, Sr-Nd-Hf isotopes
Abstract 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.
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