Discontinuidades sedimentarias en la transición Cámbrico Inferior-Medio del manto del Esla, Zona Cantábrica
- J.J. Álvaro
- E. Vennin
- E. Moreno-Eiris
- A. Perejón
- T. Bechstädt
ISSN: 1576-5172
Año de publicación: 2000
Título del ejemplar: V Congreso Geológico de España (Alicante, 10-14 julio 2000)
Número: 1
Páginas: 139-141
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
In the Esla nappe, three major discontinuities have been recognized within the Lancara Formation. Discontinuity D1 is located at the top of the white bedded limestones. It is recognized as anerosive contact and marks a sharp change from a peritidal-dominant, homoclinal ramp to aramp with oolitic and bioclastic shoals distinguished here as the grey lenticular limestones. Discontinuity D2 is placed at the top of the grey lenticular limestones and is the boundary between the lower and upper Lancara members. A discontinuous ferruginous level or hardground marks the boundary in the Esla nappe. Discontinuity D3 is placed at the bottom of thegriotte tectofacies. It marks a major tectonic pulse and the input of fine-grained siliciclastics. Insome areas, it is not sharp but gradual. D3 is a diachronous boundary, dated in some areas ofthe Cantabrian platform. The D3 surface is easily recognisable in SW Europe as a tectonically induced contact reflecting the diachronous and progressive breakdown of some platforms in SW Europe.