Comparison between detrital zircon populations from the Ordovician rocks of the Pyrenees and from other Perigondwanan terrainspaleogeographic implications

  1. A. Margalef 1
  2. J.M. Casas 2
  3. P. Castiñeiras 3
  4. M. Navidad 3
  5. M. Liesa 2
  1. 1 Centre d’Estudis de la Neu i de la Muntanya d’Andorra, Institut d’Estudis Andorrans
  2. 2 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  3. 3 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

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Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Año de publicación: 2016

Título del ejemplar: IX CONGRESO GEOLÓGICO DE ESPAÑA

Número: 16

Páginas: 21-24

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

The first LA-ICP-MS U-Pb detrital zircon ages from quartzites located in the Ordovician rocks from the Central Pyrenees (the Rabassa Dome, Andorra) were investigated. The four studied samples present very similar U-Pb age patterns. The main age populations correspond to Neoproterozoic (Ediacarian–Cryogenian, ca. 550–750 Ma), Gre nvillian (Tonian–Stenian, ca. 850–1100 Ma), Paleoproterozoic (Orosirian, ca. 1900–2100 Ma) and Neoarchean (ca. 2500–2650 Ma). The results presented here enable us to discuss the lower Paleozoic paleoposition of the Pyrenean basement rocks. We have compared our samples with that from other Perigondwanan terrains such as Sardinia, Sicily and the Iberian Massif. The similarity with the Sardinian age distribution suggests that these two terranes could share the same source area and that they were paleogeographically close in Ordovician times in front of the Arabian-Nubian Shield. Comparisons with previous proposed reconstructions allow us to obtain a more complete view of the paleogeography of the Northern Gondwana margin during the Cambro-Ordovician.

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