Evolución ambiental holocena del estuario del Oka (reserva de la biosfera de Urdaibai, sureste del golfo de Bizkaia): respuesta al ascenso postglacial del nivel del mar

• Ane García-Artola ^[1] ; Alejandro Cearreta ^[1] ; Manuel Monge-Ganuzas ; B.P. Horton ^[2] ; D. Nikitina ^[3]
  1. [1] Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Leioa, España

     
  2. [2] Nanyang Technological University

     Nanyang Technological University

     Singapur

     
  3. [3] West Chester University

     West Chester University

     Borough of West Chester, Estados Unidos

     

  Mostrar afiliaciones +
• Localización: XV Reunión Nacional de Cuaternario Bizkaia Aretoa: Bilbao, 1-5 julio 2019. Libro de resúmenes, 2019, ISBN 978-84-17713-16-4, págs. 71-74
• Idioma: español
• Enlaces
  • Texto Completo Libro
• Resumen

  • Fluvial paleovalleys provide critical data to study the temporal superposition of depositional environments during the Holocene postglacial sea-level rise. We study eight boreholes that reached bedrock and a short replicate extracted from the Oka Estuary (Urdaibai Biosphere Reserve, southeastern Bay of Biscay). Benthic foraminifera and grain size allowed for paleoenvironmental reconstructions and radiocarbon dates put the sediment into a temporal framework.The sedimentary infill of the estuary shows a progressive shallowing of the estuary as rates of sea-level rise decreased during the Holocene: fluvial gravels on the bottom, marine and brackish intertidal sediments in the middle, and salt-marsh sediments on top. The sequence is topped by a few meters of anthropogenic deposits