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Título:
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The importance of along-margin terrane transport innorthern Gondwana: insights from detrital zircon parentagein Neoproterozoic rocks from Iberia and Brittany
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Autores:
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Fernández Suárez, Javier ;
Gutiérrez Alonso, Gabriel ;
Jeffries, Teresa E.
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Tipo de documento:
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texto impreso
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Editorial:
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Elsevier Science B.V., Amsterdam, 2002
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Dimensiones:
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application/pdf
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Nota general:
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cc_by_nc_nd
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Geodinámica
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Materia = Ciencias: Geología: Petrología
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Tipo = Artículo
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Resumen:
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Detrital zircons from late Neoproterozoic rocks of the peri-Gondwanan Cadomian belt of SW Iberia and north Armorican Domain of Brittany record Neoproterozoic (ca. 860-550 Ma), Palaeoproterozoic (ca. 2300-1800) and Archaean (ca 3300-2600 Ma) U-Pb ages. The absence of Mesoproterozoic zircons suggests that these terranes evolved in a peri-W African realm. This is in contrast to other western European terranes that preserve Mesoproterozoic zircons and are likely to have evolved in a peri-Amazonian realm. Such a contrast in detrital zircon populations, coupled with the presence of Mesoproterozoic zircons in the Ordovician Armorican quartzite, deposited in a peri-African platform, is interpreted to record along-margin terrane transport. The change in provenance suggests that subduction was replaced by transform faults that juxtaposed Amazonia-derived terranes against W Africa-derived terranes to form the Avalonia and Armorica microcontinents. Subsequent extension along the margin resulted in the birth of the Rheic Ocean and the outboard drift of Avalonia.
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En línea:
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https://eprints.ucm.es/58684/1/639.pdf
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