Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2841
Título: Detrital zircon geochronology of the Carboniferous Baixo Alentejo Flysch Group (South Portugal); constraints on the provenance and geodynamic evolution of the South Portuguese Zone
Autor: Rodrigues, B.
Chew, D. M.
Jorge, Raul C. G. Santos
Fernandes, P.
Pires, Cristina Veiga
Oliveira, José Tomás
Palavras-chave: Geocronologia
Evolução geodinâmica
Estratigrafia regional
Flysch
Carbónico
Baixo Alentejo (Portugal)
Zona Sul Portuguesa
Portugal (Sul)
Data: Mai-2015
Citação: Rodrigues, B... [et al.] - Detrital zircon geochronology of the Carboniferous Baixo Alentejo Flysch Group (South Portugal); constraints on the provenance and geodynamic evolution of the South Portuguese Zone. In: Journal of the Geological Society, Vol. 172, Part 3 (May 2015), p. 294-308
Resumo: U–Pb detrital zircon data from the Baixo Alentejo Flysch Group in the South Portuguese Zone show significant age differences between formations. The Visean Mértola Formation and Serpukhovian to early Bashkirian Mira Formation are dominated by zircons in the 316–388?Ma age range, whereas the late Bashkirian to late Moscovian Brejeira Formation is dominated by zircons with an age range of 498–687?Ma. Detrital zircons spanning an age range of 0.9–1.1?Ga are present in the Brejeira Formation but are absent in the Mértola and Mira formations. Detrital zircon ages of the Mértola and Mira formations indicate provenance from an extra-basinal source (Ossa–Morena Zone) with a minor intra-basinal contribution (South Portuguese Zone). The abundant presence of detrital zircon with age ranges of 500–750 and 0.9–1.1?Ga in the Brejeira Formation suggests a sediment source from the Avalon–Meguma terranes with limited recycling from the SW Portugal Domain. The different inferred source areas for the Baixo Alentejo Flysch Group formations are attributed to the presence of a forebulge that was formed in Mid-Visean times during the foreland phase of the South Portuguese Zone. The forebulge acted as a physical barrier separating sub-basins that accumulated the Mértola–Mira and Brejeira sediments respectively.
URI: http://hdl.handle.net/10400.9/2841
DOI: http://dx.doi.org./10.1144/jgs2013-084
ISSN: 0016-7649
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