TY - JOUR ID - TI - HYDROGEOCHEMICAL MODELOF THE SODIUM SULPHATE SALT DEPOSITWITHIN SHARI SALT MARSH-CENTRAL IRAQSOURCE AND ORIGINOFTHENARDITE MINERAL الموديل الهيدروجيوكيميائي لترسبات ملح كبريتات الصوديومفي بحيرة الشاري – وسط العراق AU - بيان محي حسين PY - 2008 VL - 1 IS - 1 SP - 9 EP - 27 JO - IRAQI JOURNAL OF DESERT STUDIES المجلة العراقية لدراسات الصحراء SN - 19947801 26649454 AB - This study covers the examination of groundwater chemical analyses from the Hydrogeological System between Hemrin Anticline and Tigris River, surrounding the area of Shari Salt Marsh. The established Hydrogeochemical Model shed light on brines enrichment and Thenardite precipitation .
The physico-chemical processes that occurred within the groundwater of the 1st, 2nd and 3rd Hydrogeological Units and their interrelationships, could be considered as main direct factor affecting the hydrogeologic regime of brines enrichment and accumulation, followed by the effectiveness of the stream water and sheet runoff water during rainy seasons .
The main hydrogeochemical mechanisms that occurred within the hydrogeologic system are :-
1-Dissolution and leaching mechanisms.
2-Adsorption and ion exchange mechanisms.
3-Mixing and enrichment mechanisms, due to the following processes :
a-Molecular Diffusion Process, (causes a mixing at a contact front between two fluids).
b-Mechanical Dispersion Process, (causes a mixing due to irregular tortuous flow at different velocities).
c-Convection Transport Process, (Solute mixing due to bulk flow of groundwater and velocities).
4-Precipitation of salts hosted in Shari Salt Marsh, included (Thenardite, Halite, Gypsum).

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