evaluating the geochemistry of brine springs in the northern khorram abad, iran

For the first time evaluation of the geochemistry of brine springs located in northern khorram abad, northern high zagros zone, was conducted in this study. the springs emerge in carbonate and marl successions of the lower miocene gachsaran formation, the most important cap rock of oil reservoirs in the zagros basin, and the carbonate of the middle cretaceous deposits. a total of 24 samples were taken for xrd analysis, 15 for xrf analysis, and 30 samples for icp-oes analysis. the results of chemical analysis show that halite is the most important mineral in evaporate deposits, while gypsum, quartz, anhydrite, cristobalite, and dolomite were present at minor levels. various geochemical evidences such as lower ratio than 1na/cl is less than 1 in the brine springs, and the concentration of trace elements b, na, cl, k, v, cr, mn, fe, cu, as, br, rb, sr, zr, cs, the indicating their deep-basin origin. these springs have found their way to the earth's surface along the faults in the form of fault springs through the lower (jurassic) evaporite deposits.