Evidence of a Cenomanian shallow-marine carbonate platform in the northwestern margin of the Bortziriak-Cinco Villas massif, eastern Basque-Cantabrian Basin

  1. Martin Ladron de Guevara 1
  2. Arantxa Bodego 1
  3. Eneko Iriarte 2
  4. Luis Troya 3
  5. Laura Damas-Mollá 1
  6. Arantza Aranburu 1
  1. 1 Geologia Saila, Zientzia eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea. Leioa
  2. 2 Laboratorio de Evolución Humana, Departamento de Historia, Geografía y Comunicación – Laboratorio de Isótopos Estables IsoTOPIK, Edificio de I+D+i, Universidad de Burgos, Burgos
  3. 3 Museu de Ciències Naturals de Barcelona, Departament de Paleontologia, Barcelona
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Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2023

Issue: 74

Pages: 19-22

Type: Article

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Abstract

Basin margin evolution of rift basins is not always well constrained. In the northeastern margin of the Basque-Cantabrian Basin, a revision of a carbonate succession permits deciphering the transition from synto post-rift phases in the poorly studied northwestern margin of the Bortziriak-Cinco Villas massif. The sedimentological analysis shows three main lithofacies, attributed to a shallow-marine, non-rimmed carbonate platform. On the other hand, biostratigraphic analysis based on the presence of Caprina adversa rudist indicates a Cenomanian age for the succession. Thus, this study illustrates the existence of a Cenomanian shallow-marine carbonate platform unconformably overlying the Palaeozoic massif. This platform development was the result of a generalized transgression during the early post-rift stage.

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