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Mode and timing of terrane accretion in the forearc of the Andes in Ecuador

Abstract:

The volcanic basement of the Ecuadorian Western Cordillera (Pallatanga Formation and San Juan unit) is made up of mafic and ultramafic rocks that once formed an oceanic plateau. Radiometric ages from these rocks overlap with a hornblende 40 Ar/ 39 Ar plateau age of 88 ± 1.6 Ma obtained for oceanic plateau basement rocks of the Piñon Formation in coastal Ecuador, and with ca. 92-88 Ma ages reported for oceanic plateau sequences in the Caribbean and western Colombia. These results suggest that the oceanic plateau rocks of the Western Cordillera and flat forearc in Ecuador are derived from the Late Cretaceous Caribbean-Colombia oceanic plateau. © 2009 the Geological Society of America. All Rights Reserved.

Año de publicación:

2009

Keywords:

    Fuente:

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    scopusscopus

    Tipo de documento:

    Conference Object

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Tectónica

    Áreas temáticas:

    • Ciencias de la Tierra de Europa

    Contribuidores:

    Winkler W.Winkler W.
    Heller F.Heller F.
    Cristian VallejoCristian Vallejo
    Bussy F.Bussy F.
    Luzieux L.D.A.Luzieux L.D.A.
    Spikings R.A.Spikings R.A.