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- Title
Sistema Aquífero Içá-Solimões em Cruzeiro do Sul, Acre: Caracterização Hidrodinâmica, Hidrogeoquímica e Isotópica.
- Authors
Azevedo da Silva, Talita; Ramiro Mesquita, Gabriel; Ferreira do Rosário, Fátima; da Silva Júnior, Gerson Cardoso
- Abstract
Cruzeiro do Sul, the second most populous city in the State of Acre, is supplied mainly by groundwater. The most exploited aquifer in the region is the Içá-Solimões, of which little is known, despite being heavily exploited for decades. The present work aims, therefore, to study and characterize the Içá-Solimões Aquifer System (ISAS) in the region of Cruzeiro do Sul, in order to reduce this knowledge gap. The study was based on deep wells data from the Brazilian Geological Survey's groundwater database (SIAGAS - CPRM portal) and the well inventory of Acre Water Authority. In situ data collected during a field campaign conducted in the region also played a major role in the study, which included piezometric data, water sampling, chemical and isotopic analyzes and their subsequent interpretation. The purpose was to get a better understanding of ISAS hydrogeological functioning and general characteristics. Results allowed identification of at least three geological layers with distinct hydrogeological characteristics in the system, within sandstones interbedded with argillites. The piezometric level map of the aquifer system showed a local flow trend from the higher areas of the city, with a tabular relief, toward the river valleys. Interpretation of chemical analyzes showed predominantly bicarbonate-sodium and, secondarily, bicarbonate-calcium water types, resulting from the dissolution of silica minerals, according to the author's interpretation. Deeper layers present a distinct hydrochemistry from the shallow ones, pointing to differentiated processes of water-rock interaction, both spatially and temporally. The isotopic results showed the presence of ancient waters in the deepest aquifer layers, with about 18 ka of age. Thus, potential recharge areas of the deep aquifer lie to the west, most likely in Peruvian territory.
- Publication
Anuario do Instituto de Geociencias, 2019, Vol 42, Issue 3, p410
- ISSN
0101-9759
- Publication type
Academic Journal
- DOI
10.11137/2019_3_410_419