Abstract
The salinity of water in the Triassic and Jurassic Navajo Sandstone in southeastern Utah has increased locally since 1952. The Navajo aquifer, within the Navajo Sandstone, is major source of water for domestic use and livestock in the area. From 1989 to 1991, concentration of dissolved solids in one well increased by as much as 5500 mg/L. The source or sources of the saline water and the reasons for the local increases are not known; however, mixing with either oil-field brines (OFB) or non-oil-field brines (NOFB) from the Pennsylvanian Paradox Formation could possibly cause the increase salinity. One of the objectives of an ongoing study is to use end-member mixing models and step-wise discriminant analysis to determine the possible source or sources of saline water causing the observed increase in salinity in the Navajo aquifer. Discriminant analysis was used on the major-ion/chloride ratios to identify saline-water sources that could have mixed with Navajo aquifer water.
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