Isotopic Composition and Hydrogeochemistry of a Periglacial Andean Catchment and its Relevance in the Knowledge of Water Resources in Mountainous Areas

SILEO NOELIA ROMINA; SILEO NOELIA ROMINA; LIAUDAT, DARIO TROMBOTTO; LIAUDAT, DARIO TROMBOTTO; DAPEÑA CRISTINA; DAPEÑA CRISTINA

ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES

TAYLOR & FRANCIS LTD

Lugar: Londres; Año: 2020 vol. 56 p. 480 - 494

1025-6016

ABSTRACT:Glacial and periglacial basins contain the largest reserves of fresh water in the world. These areas are extremely sensitive to global warming and climate change. The dry Andes of South America are characterized by large periglacial areas. This study focuses on the water isotopic composition and hydrochemistry of a typical periglacial environment of the Andes, in the Vallecitos catchment (2400-5500 m above sea level.), Cordillera Frontal, Argentina. Detailed fieldwork was conducted between 2013- 2017 with 240 samples collected for major ions and physicochemical parameters, and 67 samples analysed for 2H and 18O. The chemical composition of precipitation is typical Ca-HCO3, while streams and groundwaters are Ca-MgSO4 type. The isotopic content of precipitation shows a wide dispersion. The snow samples are in general more depleted than the rainfall. Some springs vary its composition seasonally, associated to the fusion of perennial snow patches. In general, all samples from the upper basin present depleted isotopic contents related to recharge at higher altitudes, whereas samples from the lower basin show more enriched values. Intermediate compositions reflect the fusion of snow and degrading ice-rich permafrost. These results will give a better understanding of the dynamics of water to manage water resources.