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Use of Multispace Technique to Determine the Contribution of Reinjected Sediments in the Mantle (E.G. Lesser Antilles)

  • B. Dupre
  • C. J. Allegre
Part of the NATO ASI Series book series (ASIC, volume 258)

Abstract

Based on the technique described by Allègre et al (1987) we demonstrate in this paper that sediments having isotopic characteristics similar to the sediments located near the island arc do not contribute to the genesis of Lesser Antilles volcanics. Two solutions are possible to explain the isotope results :
  1. 1)

    very peculiar sediments exist in the source of the basalts or,

     
  2. 2)

    an old lithosphere having isotope characteristics similar to the source of tholeiites from Parana and eastern USA exists beneath the Lesser Antilles.

     
The second conclusion is that this technique is clearly more sensitive than the two classical diagrams (207Pb/204Pb - 206Pb/204Pb, 208pb/204pb - 206pb/204pb).

Keywords

Oceanic Crust Magma Genesis Subcontinental Mantle Isotopic Structure Crust Mantle System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Allègre C.J., Hamelin B., Provost A., Dupré B., ‘Topology in isotopic multispace and origin of mantle chemical heterogeneities’, Earth Planet. Sci. Lett., 81, 319–337, (1987)CrossRefGoogle Scholar
  2. Amstrong R.L. and Cooper J.A., ‘Lead isotopes in island arcs’, Bull. Volcanol., 35, 27–37, (1971)CrossRefGoogle Scholar
  3. Dupré B. and Allègre C.J., ‘Pb-Sr-Nd isotopic correlation and the chemistry of the North Atlantic mantle’, Nature, 286, 17–22, (1980)CrossRefGoogle Scholar
  4. Carlson R., ‘Isotopic constraints on Columbia River Flood Basalt genesis and the nature of the subcontinental mantle’. Geochim. Cosmochim. Acta, 48, 2357–2372, (1984)CrossRefGoogle Scholar
  5. Davidson J.P., ‘Lesser Antilles isotopic evidence of the role of subducted sediments in island arc magma genesis’, Nature, 306, 253–256, (1983)CrossRefGoogle Scholar
  6. Hart W., ‘Chemical and isotopic evidence for mixing between depleted and enriched mantle, northwestern U.S.A.’, Geochim. Cosmochim. Acta, 49, 131–144, (1985)CrossRefGoogle Scholar
  7. Hawkesworth C.J., Mantovani M.S.M., Taylor P.N. and Palacz G., ‘Couple crust mantle systems : evidence from the Parana of South Brazil’, Nature, 322, 356, (1986)CrossRefGoogle Scholar
  8. Morris J.D. and Hart S.R., ‘Isotopic and incompatible element constraints on the genesis of island arc volcanics from Cold Bay and Amak Island Aleutians and implications for mantle structure’, Geochim. Cosmochim. Acta, 47, 2015–2030, (1983)CrossRefGoogle Scholar
  9. Pegram W., ‘The isotope, trace element and major element geochemistry of the Mesozoic Appalachian Tholeiite Province’, Thesis of M.I.T., (1986)Google Scholar
  10. White W. and Dupré B., ‘Sediment subduction and magma genesis in the Lesser Antilles : Isotopic and trace elements constraints’. Journal of Geophysical Research, 91, 5927–5941, (1986)CrossRefGoogle Scholar
  11. White W.M., Dupré B., Vidal P., ‘Isotope and trace element geochemistry of sediments from Barbados Ridge, Demerara Plain region, Atlantic Ocean’, Geochim. Cosmochim. Acta, 49, 1875–1886, (1985)CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • B. Dupre
    • 1
  • C. J. Allegre
    • 1
  1. 1.Laboratoire de Géochimie et CosmochimieInstitut de Physique du Globe de ParisParis Cedex 05France

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