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STRATI 2013 pp 787-791 | Cite as

Facies and Stratigraphic Controls of the Palaeokarst Affecting the Lower Jurassic Coimbra Group, Western Central Portugal

  • Luca Antonio DimuccioEmail author
  • Luís Vítor Duarte
  • Lúcio Cunha
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

An evolutionary geological/geomorphological model is proposed to explain the spatio–temporal distribution of palaeokarst affecting a Lower Jurassic shallow-marine carbonate succession (Coimbra Group; Sinemurian), cropping out in the Coimbra–Penela region (western central Portugal), in a specific morphostructural setting (dolomitic hills). Field and laboratory data allowed a detailed facies/microfacies characterization and diagenetic interpretation to be made, with special regard to the evolution of porosity. High facies/microfacies heterogeneity and contrasts in porosity, providing efficient hydraulic circulation by the development of meso- and macropermeability, significantly influenced and controlled the earliest karst-forming processes (i.e., inception), as well as the subsequent degree of karstification during the mesogenetic and telogenetic stages of the Coimbra Group.

Keywords

Shallow-marine carbonates Lower Jurassic Facies/Microfacies analysis Dolomitization Carbonate porosity evolution 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Luca Antonio Dimuccio
    • 1
    • 2
    Email author
  • Luís Vítor Duarte
    • 2
    • 3
  • Lúcio Cunha
    • 1
  1. 1.CEGOT—Centro de Estudos em Geografia e Ordenamento do Território and Departamento de GeografiaFaculdade de Letras, Universidade de CoimbraCoimbraPortugal
  2. 2.Departamento de Ciências da TerraFaculdade de Ciências e Tecnologia, Universidade de CoimbraCoimbraPortugal
  3. 3.IMAR-CMA, Centro do Mar e do AmbienteUniversidade de CoimbraCoimbraPortugal

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