![]() ![]() Precipitation of minerals from solution, primarily alkaline earth carbonates and gypsum, results in depletion of calcium (Ca +2) and bicarbonate (HCO 3 -) and relative enrichment of sulfate (SO 4 -2) in the ground water. Intense evaporation above the water table in the salt flats concentrates the composition of brine to TDS values that range from 50,000 mg/L to greater than 300,000 mg/L. Steady increases in sodium (Na +) and chloride (Cl -) and, to a lesser degree, magnesium (Mg +2) and potassium (K +) characterize increases in total dissolved solids (TDS). ![]() ![]() Progressive increases in salinity are characteristic of the waters moving down gradient and are primarily attributed to evaporative concentration. Ground water originating in peripheral consolidated rocks and alluvial fans flows toward the center of the basin and discharges by evaporation from the salt flats. The northern Salt Basin in West Texas and New Mexico is a closed hydrologic system in which discharge of ground-water flow occurs in a series of playas, or salt flats. To purchase this publication as a downloadable PDF, please order RI0158D. Hydrogeology of a Gypsum Playa, Northern Salt Basin, Texas, by F. Gulf Coast Association of Geological Societies.Wilcox Group, East Texas, Geological / Hydrological Folios.Environmental Geologic Atlas of the Texas Coastal Zone.Atlases of Major Oil and Gas Reservoirs. ![]()
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