Tectonic-sourced groundwater arsenic in Andean foreland of Argentina: insight from flow path modeling

Mukherjee, A. and Raychowdhury, N. and Bhattacharya, P. and Bundschuh, J. and Johannesson, K. (2014) Tectonic-sourced groundwater arsenic in Andean foreland of Argentina: insight from flow path modeling. In: 5th International Congress on Arsenic in the Environment (As 2014): One Century of the Discovery of Arsenicosis in Latin America (1914-2014), 11-16 May 2014, Buenos Aires, Argentina.

Abstract

The groundwater arsenic enriched Chaco-Pampean plain of Argentina is located in the active foreland of continental arc dominated Andean orogenic belt. Rhyolitic volcanic glass fragments are a major component of the aeolian-fluvial aquifer sediments, which is dotted with many hot springs that are related to the palaeo-igneous extrusion in the vicinity. Several Salinas in the areas may have originated because of the tectonic evolution of the region. Hydrogeochemical analyses, thermodynamic mixing diagrams and flow path modeling analyses of groundwater samples collected from the Santiago del Estero province suggest that predominant evolutionary processes of the groundwater include chemical weathering with monosialitization silicate of weathering and evaporate dissolution. Anorthite, albite and As-enriched volcanic glass seems to contribute to the major dissolution phases. Subsequently, co-introduced oxyions mobilized the solid-phase As to groundwater by competitive ion exchanged. Further liberation might have taken place by counter-ion activity due to transition of the Ca-rich to Na-rich groundwater due to groundwater mixing with recharged brackish surface water from Salinas or by evaporative concentration due to the prevailing arid climate.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 Taylor & Francis Group. Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 22 Aug 2016 05:41
Last Modified: 23 Jun 2017 00:14
Uncontrolled Keywords: aquifers; arsenic; dissolution; glass; hot springs; ion exchange; silicates; tectonics; volcanoes; weathering
Fields of Research : 04 Earth Sciences > 0403 Geology > 040313 Tectonics
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
Socio-Economic Objective: D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961103 Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use)
Identification Number or DOI: 10.1201/b16767-9
URI: http://eprints.usq.edu.au/id/eprint/26816

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