Evolución paleoambiental del estuario del Oka (Reserva de la Biosfera de Urdaibai, Vizcaya)respuesta al ascenso del nivel marino durante el Holoceno
- Alejandro Cearreta 1
- M. Monge-Ganuzas 2
- 1 Dpto. Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco
- 2 Oficina Técnica de la Reserva de la Biosfera de Urdaibai, Dirección de Biodiversidad y Participación Ambiental del Gobierno Vasco
ISSN: 1576-5172
Year of publication: 2013
Issue Title: VII Jornadas de Geomorfología Litoral
Issue: 14
Pages: 163-166
Type: Article
More publications in: Geotemas (Madrid)
Abstract
In order to reconstruct the environmental transformation process of the Oka estuary (Urdaibai Biosphere Reserve) in response to sea-level changes on the Basque coast during the last 8,500 years, 8 boreholes were drilled in different estuarine areas using a rotary drill until the pre-Quaternary basement was reached. Micropalaeontological (benthic foraminifera), sedimentological (grain size) and geochemical (carbon-14 dating) analyses were performed on these materials. Based on the obtained results and by comparison with previously published information for this coastal area, the Holocene environmental evolution of the different sedimentary environments that were identified has been interpreted as the result of relative sea-level variation that exhibits a rapid rise until 7,000 cal yrs BP followed by a moderate rise since then, and a stabilization during the last 3,000 years.