A Comparison of Hydrogeochemistry and Brines evolution in Meyghan and Hoz-e-Soltan Playas

Abdi, Leila; Rezaeian Langeroudi, Saeed; Lak, Razyeh

doi:10.22034/irqua.2017.701910

A Comparison of Hydrogeochemistry and Brines evolution in Meyghan and Hoz-e-Soltan Playas

Document Type : Original Article

Authors

Leila Abdi ¹

Saeed Rezaeian Langeroudi ²

Razyeh Lak ³

¹ University of Tehran, Tehran, Iran

² Tarbiat Moalem University, Tehran, Iran

³ Research Institute of Earth Sciences, Organization of Geology and Mineral Exploration of Iran, Tehran, Iran

https://doi.org/10.22034/irqua.2017.701910

Abstract

This research is focused on study of hydrogeochemistry and brines evolution of Mighan and Hoz-e-Soltan Playas, based on studying brines and hydrogeochemistry evidences. Meyghan and Hoz-e-Soltan Playas as an intra-continental sedimentary basins, are located in Qom watershed, in central part of Iran. Both Playas are influenced by the volume of input groundwater, intermittent streams, precipitation and evaporation. In order to study the brines and their evolution process, 19 and 25 water samples were taken from center of Playas to the margins, respectively by digging holes. Physico-chemical parameters were measured in the site and geochemical analysis of brines was performed in laboratory. In addition, 95 and 109 sediment samples were collected from Meighan and Hoz-e-Soltan playas, respectively by hand auger and their mineralogy and sedimentary characters were analyzed. Major cations of both Playas are Sodium, Chloride and Sulfate; dominant evaporative minerals are Calcite, Gypsum, Halite, Thernadite and Polyhalite. Hydrochemical studies of inlet waters of both Playas indicate that mole ratio is HCO₃ << Ca + Mg, which changes into Na-Cl-SO₄ type in Meyghan Playa and Na-Ca-(Mg)-Cl type in Hoz-e-Soltan Playa during the geochemical evolution and deposition of evaporate minerals.

Keywords

Hydrogeochemistry

Brine evolution

Meyghan Playa

Hoz-e-Soltan Playa