Bioestratigrafía y reconstrucción paleoambiental del tránsito Cretácico-Paleógeno en El Mimbral (México)

  1. L. Alegret 1
  2. I. Arenillas 2
  3. Jose A. Arz 2
  4. E. Molina 2
  1. 1 Dept. Earth Sciences, University College London
  2. 2 Dpto. Ciencias de la Tierra, Universidad de Zaragoza
Aldizkaria:
Geotemas (Madrid)

ISSN: 1576-5172

Argitalpen urtea: 2004

Zenbakien izenburua: VI CONGRESO GEOLÓGICO DE ESPAÑA (Zaragoza, 12-15 julio, 2004)

Zenbakia: 6

Orrialdeak: 357-360

Mota: Artikulua

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Beste argitalpen batzuk: Geotemas (Madrid)

Laburpena

Upper Cretaceous and Lower Paleogene benthic and planktic foraminifera from the El Minibral section (Mexico) were analysed in order to infer the biostratigraphy and the paleoenvironmental turnover across the Cretaceous/Paleogene (K/Pg) boundary. In the El Mimbral section, the UpperCretaceous marly Méndez and the Lower Paleogene marly Velasco Formations are separated by a0.5 to ~3 m-thick-Clastic Unit. We studied the upper 2 m of the Méndez Formation and the lowermost 3 m of the Velasco Formation, comprising the upper Maastrichtian A. mayaroensis and P.hantkeninoides Biozones, and the lower Danian G. cretacea and Pv. eugubina Biozones, respectively. Planktic foraminifera were affected by a catastrophic extinction at the K/Pg boundary, whereas benthic foraminifera show reorganization of the community structure rather than significantextinction. The benthic foraminiferal turnover may have resulted from the drop in primary productivity after the asteroid impact at the K/Pg boundary.

Datuen iturria: Dialnet