SciELO - Scientific Electronic Library Online

vol.57 número4Sedimentología y evolución paleoambiental de la Formación Patquía (Pérmico) en el extremo sur de la sierra de Maz y cerro Bola, provincia de La Rioja, ArgentinaXenolitos ultramáficos en el cerro De la Laguna, volcanismo basáltico de retroarco en el sureste de la provincia de Mendoza, Argentina índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



  • No hay articulos citadosCitado por SciELO

Links relacionados

  • No hay articulos similaresSimilares en SciELO


Revista de la Asociación Geológica Argentina

versión impresa ISSN 0004-4822


PASQUINI, A. I.; GROSSO, L. B.; MANGEAUD, A. P.  y  DEPETRIS, P. J.. Geochemistry of mountain rivers in the Sierras Pampeanas: I. Springs and streams in the Achala batholith, Córdoba province, Argentina. Rev. Asoc. Geol. Argent. [online]. 2002, vol.57, n.4, pp. 437-444. ISSN 0004-4822.

The chemical composition of mountainous (>1,100 m a.s.l.) springs and streams from the Achala batholith, in the Pampean Range of Córdoba, Argentina are analized; in this area, the most important lithology is porphyritic monzogranite. The dominant water composition is of the bicarbonate-type and varies from sodium-potassium dominance to calcium dominance. Dissolved element concentrations are 103 to 107 times lower than those of the mean upper continental crust and the dominant granitic country rock. The concentration of dissolved phases is linked to element mobility during initial weathering, the more mobile elements (alkaline and alkaline earths) exhibiting the highest concentrations in water and rocks, whith the less mobile (Al, Ga, Ti, Zr, Hf, Th and rare earths) showing lower concentrations. Both groups of elements are subjected to a significant control exerted by the chemical nature of country rocks. Transition metals, with variable solubility and concentrations, are possibly subjected to other controls aside from the lithological one. Major ions show a summer time dilution (rainy season) close to 60%, whereas trace elements show a concentration increase due to mobilization during the rainy season. The geological characteristics of the region, along with a prevailing semiarid climate, favour the pre-eminence of a denudation regime known as "weathering-limited". In this regime, physical erosion overcomes chemical dissolution. Under such conditions, the aqueous geochemical characteristics, scarcely affected by man-made influences, reflect the control exerted by lithology and relief.

Palabras clave : Hydrochemistry; Mountain rivers; Springs; Sierras Pampeanas; Rare-earth elements.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License