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STRATI 2013 pp 649-653 | Cite as

Clays and Vegetation: Comparing Palaeoclimatic Signatures in the Portuguese Lower Cretaceous

  • Jorge DinisEmail author
  • Mário Mendes
  • Pedro Dinis
  • João Pais
  • Jacques Rey
  • Ulrich Heimhofer
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

We collected a set of 120 clay samples with precise stratigraphic locations from the Lower Cretaceous coastal outcrops of the Ericeira area (western Portugal). The kaolinite versus illite dominance can be considered as revealing wet or dry climates, respectively, prevailing in the watershed. Swelling clays are associated with seasonally dry climates. However, since hydrodynamics and rejuvenation events also control clay associations, the relative role of climate versus depositional setting is still to be fully deciphered. As the onshore Lower Cretaceous of western Portugal is a key area for studying the Early Cretaceous initial diversification of angiosperms, several well-studied floras are summarized and their environmental interpretations presented.

Keywords

Clay minerals Climate Depositional systems Fossil floras Lower Cretaceous Portugal 

Notes

Acknowledgments

This is a contribution to projects Angiogal (PTDC/CTE-GIX/104999/2008) and CretaCarbo (PTDC/CTE-GIX/113983/2009), funded by FCT (Fundação para a Ciência e a Tecnologia) and COMPETE Program/FEDER European Fund. It is, also, a contribution to project PEst-OE/CTE/UI4073/2014.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jorge Dinis
    • 1
    • 2
    Email author
  • Mário Mendes
    • 3
  • Pedro Dinis
    • 1
  • João Pais
    • 3
  • Jacques Rey
    • 4
  • Ulrich Heimhofer
    • 5
  1. 1.Earth Science DepartmentUniversity of CoimbraCoimbraPortugal
  2. 2.IMAR-CMAMarine and Environmental Reseach CentreCoimbraPortugal
  3. 3.CICEGe, Departamento de Ciências da TerraFaculdade de Ciências e Tecnologia, Universidade Nova de LisboaCaparicaPortugal
  4. 4.Géosciences Environnement ToulouseUMR CNRS 5563, Université Paul-SabatierToulouse CedexFrance
  5. 5.Institute of GeologyLeibniz University HannoverHannoverGermany

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