Espesores y contenido de CaCO3 en los pares marga-caliza del Daniense (Sopelana, Arco Vasco)

Abstract

The Sopelana sea-cliff section exposes, a continuous marl-limestone alternation from the Danes in the deep Basque Arc domain. The 95 rhythms studied represent ~1180 ka and correspond to ~20cm/20ka. The limestone layers are thicker than marls and the Fischer diagram detects several shifts of high sedimentation and some well-marked minimums. The high-resolution of the twelve limestone layers (<1cm/analysis; 317 analysis, 3.06 m) shows complex curves indicative of climatic fluctuations. The pink-white colour variations are indicative of accidental oxygenated water masses presence, without diagenesis influence