Multidisciplinary study of the quaternary deposits of the Vila Nova de Gaia, NW Portugal, and its climate significance

Autor: Ilda Abreu, Helena Ribeiro, J. R. Vidal Romani, A. Pinto de Jesus, Fernando Noronha, J. Sanjurjo
Rok vydání: 2019
Předmět:
Zdroj: Journal of Iberian Geology. 45:553-563
ISSN: 1886-7995
1698-6180
Popis: Palynological, geochronological, and sedimentological analyses were conducted on samples from different depositional units of well-preserved marine, fluvial and palustrine sedimentary deposits from Vila Nova de Gaia located at the northwestern Portuguese coast. The studied deposits occur on two terraces: Terrace A—Lavadores (18 m to 33 m) and Terrace B—Canidelo (50 m). Chronological and sedimentological features allowed to date the deposits to the Upper Pleistocene until the last glacial period, being observed an evolution from a depositional setting in a marine intertidal zone, passing to a fluvial environment and ending in a palustrine/lagunar environment with possible periglacial influence. Pollen assemblages collected in the fluvial sedimentary horizons also suggested changes in the environmental conditions. A pollen content with good representation of arboreal species (Quercus, Pinus, Castanea, Fraxinus, Salix, Betula and Corylus), changed to a vegetation environment dominated by non-arboreal species, such as Poaceae, Plantago and Asteraceae. The top horizons, corresponding to a palustrine/lagunar environment, presented a pollen profile completely dominated by non-arboreal species, with minimal tree representation (Prunus, Quercus, Pinus and Castanea) which, combined with sedimentological characteristics may point to a more dry and cold climate than nowadays.
Databáze: OpenAIRE
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