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STRATI 2013 pp 1303-1307 | Cite as

A Record of Upper Hauterivian Climatic Variability in a Lagoonal Environment in the Lusitanian Basin

  • C. LézinEmail author
  • P. S. Caetano
  • P. Gonçalves
  • J. Rey
  • F. Rocha
  • R. B. Rocha
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Using the example of the upper Hauterivian in the Lusitanian Basin, we demonstrate a climatic control of cyclic variations in the biological, mineralogical, chemical, and magnetic markers in a lagoonal environment. In a lagoonal setting, variations in detrital supply, controlled by climate changes, modify the water turbidity. During humid climatic conditions, the increase in water turbidity reduces light penetration and photosynthetic activity. The reduced precipitation of carbonates is probably due to the low concentration of cyanobacteria or unicellular green algae, and is associated with a decrease in micritization processes. Another consequence of the increase in detrital supply is the reduction in benthic foraminifera, with the development of infaunal forms in favour of epifaunal forms, and the proliferation of large agglutinated foraminifera such as Choffatella decipiens. During dry climatic conditions, this tendency is reversed and there is an enhanced contribution of Miliolidae. Thus, in this lagoonal setting, climatic variability (controlled by orbital parameters) modified carbonate production, the faunal assemblages, and the water chemistry.

Keywords

Benthic foraminifera Geochemistry Magnetic susceptibility Palaeoenvironments Shallow-marine carbonates Upper Hauterivian 

Notes

Acknowledgments

This is a contribution to project PEst-OE/CTE/UI4073/2014.

References

  1. Gonçalves, P., Caetano, P. S., Rocha, F., Lézin, C., & Rey, J. (2007). Caracterização mineralógica da sequência sedimentar Ha7 do Cretácico Inferior do Guincho (Bacia Lusitaniana). Ciências da Terra,16, 143–150.Google Scholar
  2. Lézin, C., Bonnet, L., Rey, J., Caetano, P. S., Gonçalves, P., Rocha, F. T., & Rocha, R. B. (2010). Orbital forcing of stratal patterns in an inner platform carbonate succession: An example from an Upper Hauterivian series of the Lusitanian Basin, Portugal. Ciências da Terra,17, 29–44.Google Scholar
  3. Lezin, C., Caetano, P. S., Goncalves, P., Rey, J., Rocha, F., & Rocha, R. B. (2012). Biosedimentary disturbances in shallow-water carbonate environments: An example from the Upper Hauterivian in the Lusitanian Basin. Palaeogeography, Palaeoclimatology, Palaeoecology,315–316, 24–37.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • C. Lézin
    • 1
    Email author
  • P. S. Caetano
    • 2
  • P. Gonçalves
    • 3
  • J. Rey
    • 1
  • F. Rocha
    • 3
  • R. B. Rocha
    • 2
  1. 1.Université de ToulouseUPS, OMP, GET (Géosciences Environnement Toulouse)ToulouseFrance
  2. 2.CICEGeFaculdade de Ciências e Tecnologia, Universidade Nova de LisboaCaparicaPortugal
  3. 3.Universidade de Aveiro, Departamento de GeociênciasGEOBIOTEC, Campus de SantiagoAveiroPortugal

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