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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Geochemistry of a Modern Marine Evaporite: Bocana De Virrila, Peru
Susan L. Brantley, David A. Crerar, Nancy E. Moller, John H. Weare
ABSTRACT
The Bocana de Virrila, a relict estuary on the coast of northwestern Peru, exhibits unique lateral zonation of evaporite minerals (calcite, gypsum, halite) along its 20-km length. The salinity gradient in the estuary ranges from normal marine at the mouth to approximately 330,000 ppm TDS in the innermost waters. We use the Harvie-Weare chemical equilibrium model to characterize the saturation horizons of gypsum and halite in the estuary brines. The model predicts water compositions and gypsum and halite precipitation closely. Gypsum and halite precipitate in 2.5-km zones characterized by water salinities greater than 160,000 ppm and 320,000 ppm TDS, respectively. Calcite precipitation is not as extensive as expected, and very high values of alkalinity (6.0 mM 1-1 as CaCO
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