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Age of initial oceanic magmatism in the late Proterozoic Arabian Shield

Abstract:

Lead isotopic data for zircons from a dacite clast in a volcanic breccia of the oldest oceanic assemblage (immature arc or oceanic plateau) of the southwestern Arabian Shield (Baish group), acquired with the single-grain evaporation technique, yielded a mean 207 Pb/ 206 Pb age of 842 ± 17 Ma. Rb-Sr data and zircon ages for clastic metasedimentary rocks are in agreement with the new zircon age, suggesting that initial oceanic magmatism in the Arabian Shield did not begin until after 900 Ma and was coeval with arc evolution in the southern Red Sea Hills of the Sudan. -from Authors

Año de publicación:

1992

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Magmatismo

    Áreas temáticas:

    • Geología, hidrología, meteorología

    Contribuidores:

    Alfred Kron̈erAlfred Kron̈er
    Fleck R.Fleck R.
    Pallister J.Pallister J.