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Journal of Iberian Geology

, Volume 45, Issue 4, pp 553–563 | Cite as

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

  • H. RibeiroEmail author
  • A. Pinto de Jesus
  • J. Sanjurjo
  • I. Abreu
  • J. R. Vidal Romani
  • F. Noronha
Research Paper
  • 53 Downloads

Abstract

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.

Keywords

Quaternary OSL Sedimentary record Pollen 

Resumen

En este estudio, se realizaron análisis palinológicos, geocronológicos y sedimentológicos en muestras de diferentes unidades de depósitos sedimentarios marinos, fluviales y palustres bien conservados de Vila Nova de Gaia, ubicados en el margen portugués del Atlántico norte. Los depósitos estudiados se sitúan en dos terrazas: Terraza A - Lavadores (de 8 a 33 m) y Terraza B - Canidelo (50 m). Las características cronológicas y sedimentológicas permitieron datar los depósitos desde el Pleistoceno superior hasta el último período glacial, observándose una evolución desde un entorno de deposición en una zona intermareal marina, pasando a un entorno fluvial y terminando en un entorno palustre/lagunar en un área con posible influencia periglacial. Los datos de polen recolectados de los horizontes sedimentarios fluviales también sugirieron cambios en las condiciones ambientales. Un contenido de polen con una buena representación del estrato arbóreo (Quercus, Pinus, Castanea, Fraxinus, Salix, Betula y Corylus), à cambiado a un entorno de vegetación dominado por especies no arbóreas, tales como Poaceae, Plantago y Asteraceae, y con mínima representación de árboles. Los horizontes superiores, correspondientes a un entorno palustre/lagunar, presentaron un perfil de polen completamente dominado por especies no arbóreas, indicando un entorno de vegetación abierta con una representación mínima de árboles (Prunus, Quercus, Pinus y Castanea) lo que, combinado con las características sedimentológicas, puede apuntar un clima más seco y frío que hoy en día.

Palabras clave

Pleistoceno OSL Registro sedimentario Polen 

Notes

Acknowledgement

This study was financed by COMPETE 2020 through the ICT (Institute of Earth Sciences) Project (UID/GEO/04683/2013) with POCI-01-0145 Reference-FEDER-007690. The first author benefited from a scholarship (SFRH/BDP/43604/2008) Financed by QREN-POPH and FCT. The authors would like to thank Cláudia Cruz for her valuable help with the map in Fig. 1. Anonymous reviewers for their helpful and constructive comments that in our opinion allowed improving the quality of the manuscript.

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Copyright information

© Universidad Complutense de Madrid 2019

Authors and Affiliations

  • H. Ribeiro
    • 1
    • 2
    Email author
  • A. Pinto de Jesus
    • 1
    • 2
  • J. Sanjurjo
    • 3
  • I. Abreu
    • 1
    • 4
  • J. R. Vidal Romani
    • 3
  • F. Noronha
    • 1
    • 2
  1. 1.Institute of Earth Sciences, Porto-Pole PortugalPortoPortugal
  2. 2.Department of Geosciences, Environment and Spatial PlanningUniversity of PortoPortoPortugal
  3. 3.Instituto Universitário de Xeoloxia Isidro Parga PondalUniversidade da CoruñaA CoruñaSpain
  4. 4.Biology Department, Faculty of SciencesUniversity of PortoPortoPortugal

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