Evolución geoquímica y problemática del uso del acuífero del Arroyo Marín (Archidona-Málaga) / Geochemical evolution and the problems arising from the use of water from the Arroyo Marín aquifer (Archidona-Málaga)

RESUMEN

El estudio de las facies químicas del Arroyo Marín, afl uente más importante del río Guadalhorce, se justifi ca por el carácter selenitoso de las aguas aportadas por los numerosos manantiales existentes en la margen izquierda del arroyo y que modifi can notablemente las características organolépticas del río Guadalhorce que nutre de agua a la provincia de Málaga. Además, desde el punto de vista sanitario se aprecian altas concentraciones de magnesio y nitratos, que desaconsejan su consumo humano, hecho importante por ser una zona de tránsito para excursionistas. El acuífero analizado está marcado a su vez por la actividad del imponente karst de yesos de Archidona, cuya cuenca de recepción tiene numerosas dolinas y las aguas drenan por conexiones subterráneas laberínticas, poco conocidas, que consolidan las facies hidroquímicas del suelo

ABSTRACT

The chemical facies from the stream Arroyo Marin, the largest tributary to the river Guadalhorce, is considered to be worthy of study, due to the high selenium content in the waters emanating from the numerous springs found to the left margin of the stream. These waters considerably modify the organoleptic characteristics of the river Guadalhorce, which serves as an important source of water for the province of Malaga. Furthermore, from a health safety point of view, these waters present high concentrations of magnesium and nitrate, rendering them unsuitable for human consumption. This is an important consideration, given that the areas is popular as a country treking destination. The aquifer under analysis is also characterised by the imposing activity of the Archidona gypsum karst, whose rainfall cachment area has numerous sinkholes. The water is subsequently drained into the ground through a little known laberynth of subterranean conections, which help determine the hydrochemical facies of the terrain