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
The Sopelana sea-cliff exposes marl-limestone couplets from the Upper Maastrichtian (MS1 and MS2 sections) 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....
| Autores: | , , , , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2010 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositório: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | espanhol |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/7509 |
| Acesso em linha: | http://hdl.handle.net/10272/7509 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Colour Marl-limestone couplets Late Maastrichtian Early Eocene Basque Arc |
| Resumo: | The Sopelana sea-cliff exposes marl-limestone couplets from the Upper Maastrichtian (MS1 and MS2 sections) 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. a more regular MS2 couplets. This may be due to a drastic environmental change (long humid and rainy alternating to drier periods) towards dominant humid and rainy periods, with a minor seasonal nature and high sedimentation rate (72 cm/20 ky). The deep, cold, oxygenated marine water produces a change of coloration (grey to purple) during the sedimentation, in the Upper Maastrichtian couplets before diagenesis activity. It is the beginning of the Cretaceous oceanic red beds (CORB´s) |
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