Writers : Torshizian.H & Moussavi-Haram1.R
Refference : Geosciences Scientific Quarterly Journal,No.:29-30,P.:16
Publishing Year : 1377

Abstract :
Zarin Playa is located about 75 km northeast of Ardakan in Central Iran and covers an area of about 600km. 2 Baud on texturai, mineralogical and geochemical characteristics, of sediments, Zarin Plays have been divided into the following zones, starting from margin towards the center: high sandy mud, low sandy mud, salt zone and wet zones. One of the most important geomorphologleal features in the study area Is the sand dunes that extends from southeast toward northwest and divides playa into two parts.
Geochemlcally, the most common oxides in surface sediments of playa isSiO 2 and the most common mineral is quartz which is related to the exposure of high content quartz rocks around the playa. The maximum concentration of evaporite minerals are at the depth of 200 cm,whlch lathe surface of water table, and also at the depth of 40 to 50 cm below the surface which is related to the evaporation of high saline sub-surface water.
Hydrochemlstry of groundwater shows that the most common catlons and anions In groundwater, are Na, Ca, Mg, K, Cl, SO4 ,SO4, CO3 -2 +HCO3 - Hardness and total dissolved solid of groundwater are very high and Ph is in the range of neutral to slightly alkalIne water. Based on chemIcal composition, th groundwater can be classified as a second type of meteoric saline water.
In general, geochemistry of sedIments and hydrochemlstry of sub-surface water in Zarin Plays are mainly affected by the llthology of the surrounding rocks.
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