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Petrographic and Geochemical Characterisation of Organic Matter of Precambrian Black Shales from Ossa-Morena Zone, South of Portugal

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Advances in Geoengineering, Geotechnologies, and Geoenvironment for Earth Systems and Sustainable Georesources Management

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Abstract

Black shale (BS) lithologies are represented in Precambrian (Ediacaran) of Ossa-Morena Zone, SW of Iberian Massif, through the Série Negra lithological succession. The organic matter (OM) investigation in BS is relevant to understanding the mechanisms and depositional paleoenvironments related to that genesis. This study aims to characterise the OM in BS from the Série Negra succession through petrographic and geochemical methodologies. The petrographic study allowed the identification of organic particles with variable abundance, size and shape in all samples. The maximum reflectance indicates that the OM corresponds to anthracite to semi-graphite. OM maturation variation in the Série Negra succession is related to variable burial evolution and metamorphic/metasomatic processes in the Ossa-Morena Zone sectors.

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Acknowledgements

This work was supported by national funds through FCT—Fundação para a Ciência e a Tecnologia, under the project UIDB/04683/2020, Institute of Earth Sciences. V. Laranjeira is also grateful to the financial support granted by FCT and the EU through national funds and European Social Fund with a PhD scholarship (SFRH/BD/137567/2018). Finally, N. Moreira and P. Nogueira acknowledge the contribution of the project ALT20-03-0145-FEDER-000028, funded by Alentejo 2020 through the FEDER/FSE/FEEI.

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Authors and Affiliations

  1. Department of Geosciences, Environment and Spatial Planning, University of Porto, Porto, Portugal

    Vanessa Laranjeira & Deolinda Flores

  2. Institute of Earth Sciences—Pole of Porto, Porto, Portugal

    Vanessa Laranjeira, Joana Ribeiro & Deolinda Flores

  3. Department of Earth Sciences, University of Coimbra, Coimbra, Portugal

    Joana Ribeiro

  4. Department of Geosciences, University of Évora and Institute of Earth Sciences—Pole of Évora, Évora, Portugal

    Noel Moreira & Pedro Nogueira

  5. Laboratory of Palinofacies and Organic Facies (LAFO), Department of Geology, Institute of Geosciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

    João Graciano Mendonça Filho

Authors
  1. Vanessa Laranjeira
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  2. Joana Ribeiro
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  3. Noel Moreira
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  4. Pedro Nogueira
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  5. João Graciano Mendonça Filho
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  6. Deolinda Flores
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Corresponding author

Correspondence to Vanessa Laranjeira .

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Editors and Affiliations

  1. Department of Geotechnical Engineering and LABCARGA, School of Engineering - ISEP, Polytechnic, Porto, Portugal

    Helder I. Chaminé

  2. Department of Geotechnical Engineering and LGMC, School of Engineering - ISEP, Polytechnic, Porto, Portugal

    José Augusto Fernandes

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Laranjeira, V., Ribeiro, J., Moreira, N., Nogueira, P., Mendonça Filho, J.G., Flores, D. (2023). Petrographic and Geochemical Characterisation of Organic Matter of Precambrian Black Shales from Ossa-Morena Zone, South of Portugal. In: Chaminé, H.I., Fernandes, J.A. (eds) Advances in Geoengineering, Geotechnologies, and Geoenvironment for Earth Systems and Sustainable Georesources Management. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-031-25986-9_16

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