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An Archean geomagnetic reversal in the Kaap Valley pluton, South Africa

Abstract:

The Kaap Valley pluton in South Africa is a tonalite intrusion associated with the Archean Barberton Greenstone Belt. Antipodal paleomagnetic directions determined from the central and marginal parts of the pluton record a geomagnetic reversal that occurred as the pluton cooled. The age of the reversal is constrained by an 40Ar/39Ar plateau age from hornblende at 3214 ± 4 million years, making it the oldest known reversal. The data presented here suggest that Earth has had a reversing, perhaps dipolar, magnetic field since at least 3.2 billion years ago.

Año de publicación:

1996

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Paleomagnetismo

    Áreas temáticas:

    • Geología, hidrología, meteorología
    • Ciencias de la Tierra de América del Norte
    • Paleontología

    Contribuidores:

    Layer P.W.Layer P.W.
    Alfred Kron̈erAlfred Kron̈er
    McWilliams M.McWilliams M.