RT Journal Article
T1 Variaciones de color y contenido de CaCO3 en los pares margacaliza del Maastrichtiense superior y Eoceno inferior en Sopelana (Arco Vasco): reflejo de cambios paleoambientales
T1 Colour and CaCO3 content in the Upper Maastrichtian and the Lower Eocene couplets at Sopelana (Basque Arc):palaeoenvironmental responses
A1 Iridoy, Peru
A1 Zudaire, Saioa
A1 Azaguirre, Maddi
A1 Dorronsoro, Ane
A1 Olano, Galder
A1 Beriain, Eneko
A1 Usarbarrena, Ariane
A1 Elorza, Javier
AB The Sopelana sea-cliff exposes marl-limestone couplets from the Upper Maastrichtian (MS1 and MS2sections) and the Lower Eocene (EI section), in the deep Basque Arc domain. The high-resolution analysis(% CaCO3) of the MS1 couplets confirms a complex behaviour with strong compositional contrast vs. amore regular MS2 couplets. This may be due to a drastic environmental change (long humid and rainyalternating to drier periods) towards dominant humid and rainy periods, with a minor seasonal nature andhigh sedimentation rate (72 cm/20 ky). The deep, cold, oxygenated marine water produces a change ofcoloration (grey to purple) during the sedimentation, in the Upper Maastrichtian couplets before diagenesisactivity. It is the beginning of the Cretaceous oceanic red beds (CORB´s)
PB Universidad de Huelva
YR 2010
FD 2010
LK http://hdl.handle.net/10272/7509
UL http://hdl.handle.net/10272/7509
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026