Resumen de Evolución vertical del relleno sedimentario Holoceno de la Laguna de Gallocanta. Cordillera Ibérica. NE de España
A. Soria Juan, Aránzazu Luzón Aguado, Antonio Pérez García, Ana Cristina Roc Gargallo
Gallocanta lake is a saline wetland with a maximum length of 7.5 km and a maximum width of2.85 km. The water depth varies significantly, from a maximum depth of 2 m to completelydrying up. From the correlation of the samples taken, five sedimentary facies have been defined. The analysis of these has enabled the identification of three distinct stages in the general evolution of the basin. The first stage is an alluvial period, developing within an arid climate. The second one is, a more humid stage facilitates the installation of a shallow carbonated lake. A reduction of the water level, probably due to a more arid stage provokes mineralization of thelacustrine brine and the change to the third stage, during which there is an evaporitic-carbonated sedimentation with a high production of organic material. During this final stage, which corresponds to the present conditions, the water layer has experienced frequent oscillations and conditions alternating between predominantly carbonated sedimentation with high production of organic material in humid conditions, and saline sedimentation in low water level conditions in which total dryness may occur.
