Lower Paleocene Microcodium-rich calcarenites in hemipelagic areas of the Subbetic Zone, SE SpainSr isotopes, source area and palaeogeographic implications

  1. V. Pujalte 1
  2. B. Schmitz 2
  3. A. Payros 1
  1. 1 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

  2. 2 University of Lund, Suecia
Revista:
Geogaceta

ISSN: 0213-683X

Año de publicación: 2019

Título del ejemplar: Comunicaciones presentadas en la LXVI Sesión Científica / Leioa (Bilbao), 24 de mayo de 2019

Número: 66

Páginas: 19-22

Tipo: Artículo

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Otras publicaciones en: Geogaceta

Resumen

The Danian−early Selandian Olivares and Majalcorón formations are two calcarenite units rich in Microcodium remains that were accumulated in a marine hemipelagic setting of the Subbetic Zone (Betic Cordillera, southern Spain). Their outcrops are restricted to relatively small areas surrounded by uplifted Jurassic calcareous massifs, some of them with volcanic intercalations. The calcarenites contain lithoclasts of Lower Jurassic and lowermost Cretaceous age, and the 87 Sr/ 86 Sr isotopic ratios of the Microcodium remains suggest that they were originated in roots of plants that grew on Lower Jurassic carbonates. These facts entail that the Microcodium remains came from the calcareous massifs adjacent to their outcrops, the upper parts of which were subaerially exposed and colonized by Microcodium -producing plants during the Danian−early Selandian interval. The subaerial exposure of these massifs may have resulted from a coeval tectonic reactivation of Mesozoic syn-rift faults and folds, a eustatic sea level fall, or a combination of both processes.

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Información de financiación

Contribution to the project CGL2015- 65404-R (Spanish Ministry of Economy and Competitiveness and FEDER funds) and Consolidated Research Group IT930-16 (Basque Government). The constructive reviews of A. Martín-Algarra and J. M. Molina, and the suggestions of the Editor M. Díaz Azpiroz, are greatly appreciated.

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Fuente de los datos: Dialnet