Repetición vertical de estructuras y patrones de cavernamiento en el Parque Nacional de Ordesa y Monte Perdido (N de España) y su relación con el funcionamiento de la recarga en el sistema kárstico
- Antonio González Ramón
- Jorge Jódar
- José María Samsó
- Sergio Martos Rosillo
- Javier Heredia
- Ane Zabaleta
- Iñaki Antigüedad
- Emilio Custodio
- Luis Javier Lambán
ISSN: 1696-1897
Year of publication: 2021
Issue: 16
Pages: 85-92
Type: Article
More publications in: Boletín de la Sociedad Española de Espeleología y Ciencias del Karst: SEDECK
Abstract
The geological disposition and the tectonics of Tertiary carbonates observed in the head of the Arazas river (PNOMP), with overturned folds separated by overthrusts staked in various levels, is reflected in the endokarstic development, with a vertical repetition of cave patterns. The karstic networks are organized in branchwork caves that channel infiltrating water to the collectors, with a water table cave pattern that ends in terminal sumps. Successive collectors have been developed in steps related with synclinal structures, with temporally perched saturated zones caused by the presence of a minor permeability bottom constituted by the Marboré sandstones. Tracer tests carried out in the area have shown that all these perched saturated zones are hydrogeologically inter-connected. The monitoring of the temporal evolution of the discharge, temperature and electric conductivity of groundwater allowed studying the recharge and the hydrogeological system dynamics. The preferential snowmelt diffuse recharge in opposition to the fast recharge related with summer storms, allows to explain the development of water-table caves patterns in epiphreatic galleries, in opposite to looping caves patterns, as would be expected due to the characteristics of the aquifer. Palabras clave: Ordesa, patrón de cavernamiento, recarga, trazador químico, vadose branchwork,