Indicadores geoquímicos de cambios ambientales en secuencias aluviales holocenas de Bardenas Reales

Abstract

Geochemical features and Chemical Index of Alteration (CIA), corrected for Ca from calcite, were studied in Holocene alluvial sequences from Bardenas Reales of Navarra. The five sequences, distinguished by using morphochronostratigraphic evidences, show a different geochemical pattern controlled by granulometric characteristics, bedrock weathering and soil processes. Geochemical proxies (CIA) indicate an increase in moisture during some phases of Early and Middle Holocene