Middle Devonian reef-derived calciturbidites of western Ossa-Morena Zone (Portugal): conodont biostratigraphy of the Eifelian Pedreira da Engenharia Limestone

  1. Silvério, Gonçalo 3
  2. Liao, Jau-Chyn 4
  3. Valenzuela-Ríos, José I. 2
  4. Machado, Gil 1
  5. Barreto, Pedro 3
  6. Moreira, Noel 3
  1. 1 Universidade de Lisboa
    info

    Universidade de Lisboa

    Lisboa, Portugal

    ROR https://ror.org/01c27hj86

  2. 2 Universitat de València
    info

    Universitat de València

    Valencia, España

    ROR https://ror.org/043nxc105

  3. 3 Universidad de Ébora
  4. 4 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

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Journal:
Journal of Iberian Geology

ISSN: 1698-6180,  1886-7995

Year of publication: 2024

Type: Article

DOI: 10.1007/S41513-024-00242-0 GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Journal of Iberian Geology

Abstract

The first biostratigraphical study on the complete Pedreira da Engenharia quarry section (Middle Devonian, SW Portugal) is presented. A total of 32 samples were collected from the three subsections (PE-A, quarry floor; PE-B and PE-C). This led to the identification of 15 species belonging to the genera Icriodus, Polygnathus and Tortodus. Four index species were identified: P. costatus; T. australis; T. kockelianus; and P. ensensis. The age for the Pedreira da Engenharia section was updated from the costatus zone (Boogaard, 1972) to the costatus-ensensis zones (lower to uppermost Eifelian). There is a thin part of the succession representing the kockelianus and, possibly, eiflius zones, together being represented by 1,5 m. A CAI value of 5-5.5 for the conodont elements indicates a maximum temperature of over 300 ºC. The Pedreira da Engenharia Limestone, together with the Odivelas Limestone, are evidence of the development of calciturbidite sedimentation associated with atoll-like structures (only preserved in Odivelas) along the SW boundary of Ossa-Morena Zone, being probably associated with the beginning of the subduction of the Rheic Ocean during Early to Middle Devonian times.

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Funding information

Funders

  • Maria Zambrano Grant
    • MIU Next Generation EU
    • ZA21-005
  • José Castillejo Fellowship
    • MICCIN-MIU
    • CAS22/00148
  • Fundação para a Ciência e Tecnologia
    • 2020.08450.BD
    • UIDB/04683/2020
    • UIDP/04683/2020
  • FEDER/FSE/FEEI
    • ALT20-03-0145-FEER-000028
  • Universidade de Évora

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