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Palaeoenvironmental significance and pathways of calcrete development investigated with nuclear and related methods

  • Ana Luísa RodriguesEmail author
  • Maria Isabel Dias
  • Fernando Rocha
  • Maria Isabel Prudêncio
  • Rosa Marques
  • Dulce Russo
  • Guilherme Cardoso
Article
  • 25 Downloads

Abstract

The genesis and development of calcretes are discussed by using nuclear and related methods of analyses. In the studied calcrete, smectite is the main clay mineral associated with palygorskite. Chemical elements proportions, particularly V, U, Mn, Cu, Ba and REE, indicate a change to more oxidizing conditions and the contribution of bio-mediated processes in the oxalate-carbonate pathway, also confirmed by the presence of needle-fibre calcite. The proposed pathways leading to the studied calcrete development comprise both abiotic and biogenic genesis, emphasizing the polygenetic character due to different agents and processes and the paleoenvironmental trend towards aridification, with a transition between lacustrine and palustrine environments.

Keywords

Calcrete Paleoenvironmental reconstruction Clay minerals Needle-fibre calcite Chemical and mineralogical indexes Nuclear methods 

Notes

Acknowledgements

Authors gratefully acknowledge the FCT (Portuguese Science and Technology Foundation) support through the UID/Multi/04349/2013 (including the post-doctoral grant of the first author in the C2TN) and the UID/GEO/04035/2013 projects. The first author also acknowledges the financial support provided by FCT with PhD grant SFRH/BD/62396/2009 and post-doctoral grant SFRH/BPD/114986/2016.

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© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior TécnicoUniversidade de LisboaBobadelaPortugal
  2. 2.Departamento de Engenharia e Ciências Nucleares (DECN), Instituto Superior TécnicoUniversidade de LisboaBobadelaPortugal
  3. 3.Departamento de GeociênciasUniversidade de AveiroAveiroPortugal
  4. 4.GeoBioTecUniversidade de AveiroAveiroPortugal

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