Aptian-Cenomanian stratigraphy and sedimentary evolution of the BortziriCinco Villas Paleozoic Massif margins (mid-Cretaceous, western Pyrenees)

  1. A. Bodego 1
  2. E. Iriarte 2
  3. L.M. Agirrezabala 1
  4. J. García-Mondéjar 1
  5. P. Razin 3
  1. 1 UPV-EHU
  2. 2 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  3. 3 EGID, Université Bordeaux
Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Ano de publicación: 2012

Título do exemplar: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Número: 13

Páxinas: 64-67

Tipo: Artigo

Outras publicacións en: Geotemas (Madrid)

Resumo

In this work we present the correlation among the Aptian-Cenomanian lithostratigraphic units defined in the N, NW and S margins of the Bortziri Massif. Their stratigraphical and sedimentological affinities indicate that geological settings, processes and sediments were similar around the massif margins. The Aptian-Cenomanian stratigraphic record is presented in time intervals bound by main discontinuities (D1-D5). The Upper Aptian, bound between the D1 and D2, is only recorded in the NW margin as shallow-marine mixed-platform deposits. Upper Aptian to Lower Albian deposits crop out in the NW and S margins and are suggestive of sedimentation in a shallow-marine carbonate platform. Their top is represented by D3, which indicates an important erosive event during the Middle Albian. Upper Albian to Lower Cenomanian sediments were deposited in shallow- and deep-water marine environments, and recorded a tectonic pulse represented by D4 (Late Albian, dispar Zone-Early Cenomanian). Hemipelagic calcareous sedimentation characterizes the latest Early Cenomanian above D5 in the NW and S margins, and in stratigraphic continuity in the N margin. The sedimentary evolution of the margins shows the tectonic control of the depositional systems as well as the influence of a regional transgression.