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Osmium isotope systematics of historical lavas from Piton de la Fournaise (Réunion Island, Indian Ocean)

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Abstract

Re–Os isotope and elemental data have been obtained for 20 historical picrites and basalts (1931–2006) from the Piton de la Fournaise volcano on Réunion Island and two old (>0.78 Ma) cumulates from a drill hole in the eastern part of the volcano. The 187Os/188Os ratios of the historical lava samples, selected to cover the MgO concentration and Pb isotopic ranges of Piton de la Fournaise lavas, range from 0.1311 to 0.1374. This result, together with previous results on 66-Ma-old lavas from the Deccan Traps (Allègre et al. in. Earth Planet Sci Lett, 170:197–204, 1999), supports the idea that the Os isotopic signature of the Réunion plume is relatively uniform and is at the less radiogenic end of the ocean island basalt spectrum. In detail, lavas erupted before 1992 seem to have higher 187Os/188Os than the lavas erupted after the 1992–1998 period of quiescence. Comparison of 187Os/188Os ratios with Pb, Sr and Nd isotopic data on the same set of samples shows no correlation between Os and Sr–Nd isotopes, whereas a broad positive relationship with Pb isotopes is observed, which is interpreted to reflect coupled fractionation of Re/Os and U–Th/Pb in the mantle due to the partitioning of Pb and Os into sulphides. Lavas inferred to be recording the Os isotopic signature of the Réunion plume source have higher 187Os/188Os ratios than the primitive mantle values. While this might be ascribed to melting of a lithologically heterogeneous source comprising recycled oceanic crust and/or continental sediment, the expected coupled Os–Sr–Nd–Pb isotopic variations are not observed. It is thus proposed that the mantle source for Piton de la Fournaise has inherently slightly radiogenic 187Os/188Os values that could reflect a mantle domain almost isolated from recycling processes.

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Acknowledgments

We would like to acknowledge the Thermo Electron Corp. and D. Auclair for their assistance with the Triton mass spectrometer, and J.L. Birck and A. Poirier for the mixed spike 185Re-190Os preparation. We are also grateful to Chantal Bosq for Sr and Nd analyses. Samples were provided by F. Albarède, P. Boivin, P. Bachèlery, T. Staudacher, and the volcanological observatory of Piton de la Fournaise. Constructive reviews by H. Becker and three anonymous reviewers led to an improved manuscript. J. Lassiter and L. Reisberg are also thanked for helpful comments on an earlier version of the manuscript. This is laboratory of excellence ClerVolc contribution n°23.

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  1. K. David

    Present address: SUBATECH, UMR 6457, École des Mines de Nantes, CNRS/IN2P3, Université de Nantes, BP 20722, 44307, Nantes cedex 3, France

  2. P. Bonnand

    Present address: Department of Earth Sciences, The Open University, Milton Keynes, UK

Authors and Affiliations

  1. Laboratoire Magmas et Volcans, Clermont Université, Université Blaise Pascal, BP 10448, 63000, Clermont-Ferrand, France

    P. Schiano, K. David, I. Vlastélic, A. Gannoun, M. Klein, F. Nauret & P. Bonnand

  2. CNRS, UMR 6524, LMV, 63038, Clermont-Ferrand, France

    P. Schiano, K. David, I. Vlastélic, A. Gannoun, M. Klein, F. Nauret & P. Bonnand

  3. IRD, R 163, LMV, 63038, Clermont-Ferrand, France

    P. Schiano, K. David, I. Vlastélic, A. Gannoun, M. Klein, F. Nauret & P. Bonnand

  4. Laboratoire Magmas et Volcans, Université Blaise Pascal, 5 Rue Kessler, 63038, Clermont-Ferrand Cedex, France

    P. Schiano

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Schiano, P., David, K., Vlastélic, I. et al. Osmium isotope systematics of historical lavas from Piton de la Fournaise (Réunion Island, Indian Ocean). Contrib Mineral Petrol 164, 805–820 (2012). https://doi.org/10.1007/s00410-012-0774-0

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