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Registos geomorfológicos e sedimentares do Plio-Plistocénico de Peniche - Atouguia da Baleia

Title
Registos geomorfológicos e sedimentares do Plio-Plistocénico de Peniche - Atouguia da Baleia
Type
Summary of Presentation in a National Conference
Year
2017
Authors
Cunha, Pedro P.
(Author)
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Martins, António
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Gouveia, Margarida P.
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Figueiredo, Sérgio
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Duarte, João
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Pereira, Telmo
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Costa, Ana B.
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Conference proceedings National
Pages: 103-106
8º Congresso Nacional de Geomorfologia
Porto, 4 a 7 de outubro de 2017
Scientific classification
CORDIS: Social sciences > Geography
Other information
Resumo (PT): Caracterizam-se e interpretam-se os registos geomorfológicos e sedimentares do Pliocénico e do Plistocénico do litoral de Peniche - Atouguia da Baleia (Portugal central). Foram identificadas e cartografadas superfícies de abrasão marinha aos: 33-36 m, vasta plataforma culminante, mas só preservada localmente e sobreposta por areias amarelas finas a muito grosseiras cascalhentas, bem como por areias grosseiras esbranquiçadas; 24-27 m, plataforma muito extensa e sobreposta por areias grosseiras cascalhentas, por vezes cimentadas; 20-21 m, somente representada localmente, com escassos arenitos esbranquiçados muito grosseiros; 15-17 m, coberta por areias finas a muito grosseiras cascalhentas de cor amarelada e com brecha travertínica a topo; 10-12 m, pouco extensa, apresentando arenitos amarelos muito grosseiros e com brecha travertínica a topo; e aos 5-6 m, com coevo depósito marinho conglomerático e arenoso, bem como brecha travertínica a topo. A plataforma e unidade sedimentar marinha culminante são atribuídas à incursão marinha datada de 3,7 Ma e os cinco níveis de terraços marinhos posicionados acima da actual plataforma de abrasão marinha são correlacionados com os períodos de mais alto nível do mar nos Estádios Isotópicos Marinhos (MIS) do Plistocénico. A sucessão de areias finas eólicas, com intercalações contendo ossos e indústrias do Paleolítico Médio e Superior identificados na Gruta da Furninha, corresponderá ao intervalo 80-12ka (MIS4, MIS3 e MIS2), com baixo nível do mar e clima frio. As areias eólicas consolidadas do Plistocénico Superior estão cobertas por areias finas soltas, de cor branca.
Abstract (EN): A characterization and interpretation of the Pliocene and Pleistocene geomorphological and sedimentary records of Peniche - Atouguia da Baleia littoral are here presented. Several wave-cut platforms were characterized and mapped, respectively, at: 33-36 m, a vast culminant surface only locally preserved, associated with yellowish fine to very coarse pebbly sands, and also by very coarse whitish sands; 24-27 m, a very wide wave-cut platform covered by whitish bioclastic pebbly sands sometimes cemented; 20-21 m, only locally represented, with some very coarse whitish very coarse sandstones; 15-17 m, covered by fine to very coarse pebbly yellowish sands, with a fossiliferous travertine breccia at top; 10-12 m, with yellowish very coarse sandstones, with a travertine breccia at top; and 6-8 m, with a marine conglomerate and an upper coarse sandstone. The culminant marine platform and associated marine deposits are correlated with the important marine incursion dated as 3.7 Ma and the five marine terraces that are located above the modern wave-cut platform ate correlated to the periods of highest sea-level during the Pleistocene MIS¿s. In Furninha cave, the succession of aeolian fine sands intercalated with levels rich in fossils containing industries of Middle to Upper Palaeolithic should bracket the interval 80-12ka (MIS4, MIS3 and MIS2), coeval with the lowering of sea-level and cold climate conditions. The consolidated late Pleistocene aeolian pink fine sands are covered by whitish loose fine sands (MIS1).
Language: Portuguese
Type (Professor's evaluation): Scientific
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