Resumen de Registro paleoceanográfico de la cuenca Balear (ODP Leg 161, Site 975): implicaciones para el análisis de la variabilidad climática durante los últimos 40.000 años
Francisco José Jiménez Espejo, Francisca Martínez Ruiz, David Gallego Torres
The South Balearic basin is located in a key position to understand relationship between eastern and western Mediterranean basins. A geochemical/mineralogical high resolution study was carriedout on sediments from the South Balearic basin in the Western Mediterranean (ODP Site 975). Semiquantitative relative abundances of clay minerals, calcite, quartz, and feldspars are reported. Clay mineralógica! data suggest a uniform supply of detrital clays during the last 40.000 years.Marine productivity has a strong link with climatic oscillations and highest productivity corresponds to isotopic stage changes and the last déglaciation. Ba/AI peaks also correlated here withredox-sensitive trace element enrichments, probably related to lower oxygenated environments.The last Ba/AI enrichments are proposed to be time-equivalent to the Alboran Sea last organic richlayer. Digenetic remobilization of redox-sensitive elements has also occurred due to the penetration of an oxidation front. Millennial-centennial scale change has been reported and correlated with other Mediterranean records.
