Abstract
The numerous isolated brine occurrences in the Benue Trough of Nigeria share some geomorphic, geological and tectonic features in common. Evaluation of these features as well as the hydrochemical properties of the brines, is important in speculating the origin of the brines. Field observations suggest that the brines are not confined to any bedrock type but are hosted in diverse lithologies: sandstones, shales, mudstones and limestones. Despite the varied bedrock types, the hydrochemical data are generally similar. The data, in conjunction with the hydroisotopes and the general tectonics of the Benue Trough, suggest the existence of connate waters pressed out during tectonic compaction and stored in the resulting fractures.
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