GEOCHEMISTRY OF SURFACE WATERS AND WEATHERING EFFECTS IN THE UPPER CATCHMENT OF THE CTALAMOCHITA RIVER, SIERRAS PAMPEANAS DE CORDOBA (CENTRAL ARGENTINA)

DESTÉFANIS, GEORGINA,; MARTÍNEZ JORGE O.; , RIBEIRO, GUILLERMO.; GAIERO, DIEGO M.

environmental earth science

Springer

Año: 2020

The chemical composition of waters from the upper basin of the Ctalamochita River draining the Córdoba Pampean Ranges were analyzed in order to determine the chemical signature related to different forcing, geochemical processes, and solutes sources. The catchment have four sub-basins: Santa Rosa River, Grande River, Quillinzo River and De Los Sauces River. Most of the river compositions are dominated by HCO3--Ca2+ type to Ca2+-Na+-Mg2+. The specific conductivity is higher in the Santa Rosa and De Los Sauces rivers (347.59 and 409.00 μS / cm respectively) than Grande and Quillinzo rivers (125.56 and 87.54 μS / cm respectively). Mineral hydrolysis of andesine and oligoclase, and the dissolution of calco-magnesian carbonate from quarry mining, are the main dissolved solid contributors to the river waters. Saturation indexes show that the Santa Rosa and De Los Sauces rivers are saturated with calcite, dolomite and talc.