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Isotope Geochemical Studies of North Atlantic Ocean Basalts and their Implications for Mantle Evolution

O'Nions, R. K ; Evensen, N. M ; Carter, S. R ; Hamilton, P. J Talwani, Manik ; Harrison, Christopher G ; Hayes, Dennis E

Deep Drilling Results in the Atlantic Ocean: Ocean Crust, 1979, p.342-351

Washington, D. C: American Geophysical Union

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  • Título:
    Isotope Geochemical Studies of North Atlantic Ocean Basalts and their Implications for Mantle Evolution
  • Autor: O'Nions, R. K ; Evensen, N. M ; Carter, S. R ; Hamilton, P. J
  • Talwani, Manik ; Harrison, Christopher G ; Hayes, Dennis E
  • É parte de: Deep Drilling Results in the Atlantic Ocean: Ocean Crust, 1979, p.342-351
  • Descrição: The available Pb‐, Nd‐ and Sr‐isotope determinations on North Atlantic Ocean basalts are reviewed. It is shown that the sub‐oceanic mantle which has supplied these basalts has been previously depleted in Rb relative to Sr and Nd relative to Sm, and by inference large‐ion lithophile elements in general. Basaltic volcanism does not appear to have sampled mantle which is undifferentiated or primordial. The Pb‐, Nd‐ and Sr‐isotope data are compatible with continuous models of mantle differentiation, although a simplistic interpretation of the Pb‐isotope data alone suggests a single mantle differentiation event about 1.6 Gy ago. The Sr‐, Nd‐ and Pb‐isotope data can be used together with trace element abundance data to test simple two‐component mixing models. Such models do not satisfy the available data from either Iceland and the Reykjanes Ridge nor the Azores and more complex models involving additional components are required. The degree of heterogeneity is such that the system probably cannot be adequately modelled with a few discrete components.
  • Editor: Washington, D. C: American Geophysical Union
  • Idioma: Inglês
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