Portal de Periódicos da CAPES

Actividad aluvial durante la Pequeña Edad del Hielo en Bardenas Reales de Navarra

2007; Issue: 42 Linguagem: Inglês

2173-6545

Carlos Sancho, Gerardo Benito, Arsenio Muñoz Jiménez, José Luis Peña, Luis Alberto Longares Aladrén, Eric V. McDonald, Edward J. Rhodes, Miguel Ángel Saz,

Geological and Geophysical Studies Worldwide

The geomorphology, sedimentology and pedology of the most recent alluvial unit (360±101 to 216±89 14C cal BP) were studied in the Bardenas Reales Natural Park (Navarra province). This unit is either infilling former narrow channel sections, currently showing a terrace morphology (e.g. El Vedado), or insert on older morphopedosedimentary units with wide channel morphology (e.g. Salinero). It is composed of a sequence of slacked flood depositional units, centimetric in scale, with weak degree of soil development. The palaeoclimatic context is interpreted within a period of arid trend, characterised by a high hydroclimatic variability, and increase in the frequency of floods during Little Ice Age. Alluvial dynamics shows a high degree of geomorphic effectiveness as well as a very quick response to centennial scale climatic variability.