Cenomanian events in the deep western Basque Basin: The Leioa section

  • Rodriguez-Lázaro J
  • Pascual A
  • Elorza J
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Abstract

Analysis of the microfaunas (foraminifera, ostracods) and the stable isotope values (δ13C, δ18O) of the Leioa section, as representative of the deep Basque Basin, has allowed us to propose a detailed palaeoenvironmental reconstruction of this region during the Cenomanian, as well as to register global chronostratigraphic reference levels to facilitate interregional correlations. During the Cenomanian, part of the basin, the Plentzia Trough, was occupied by intermediate water masses, as deduced by the relative percentages of planktonic (Rotalipora) and benthonic foraminifera. A noticeable change is observed at the middle-late Cenomanian transition: the replacement of the dominance of keeled (rotaliporids) by incipiently-keeled (dicarinellids, praeglobotruncanids) planktonic foraminifera, indicative of the new influence of the upper intermediate waters. The temporary effect of shallow waters is deduced in one interval of the latest early Cenomanian and two more of the middle Cenomanian, as indicated by the dominance of globular planktonic foraminifera (hedbergellids). These water masses were moderately to strongly hypoxic (

Author-supplied keywords

  • Basque Basin
  • Cenomanian
  • Foraminifera
  • Ostracods
  • Palaeoceanography
  • Palaeoecology
  • Stable isotopes

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