Hidroquímica de las aguas sulfurosas de La Rioja

Abstract

In this work are studied the hydrochemical characteristics of the sulphide-bearing waters originating from springs and boreholes in La Rioja. These water points are located mainly in the Weald facies materials, especially in the Oncala Group limestones, also in the limestone facies of the Urbion and Enciso Croups. These waters have their origin in groundwater, flows through the Weald facies, that are behaved as a means of low-mean permeability. Sulphide-bearing waters belongs to calcium-sulphate and high salinity facies; the pH is basic, Eh Slightly reducing, contents in H2S and HS; among 3 and 74 mg/ I. Sulphate^-reduction with presence of organic matter seems to be the most common origin of the H2S and HS' dissolved