Anhydrite complex of the Morococha District, Peru

Formation of anhydrite layers in Jurassic Potosi limestone of the Morococha district, Peru, is attributed to hydrothermal alteration of the limestone by sulfate-rich solutions following intrusion of the Gertrudis quartz monzonite stock and prior to deposition of copper-lead-zinc-silver ores. Gypsum was later formed in the upper part of the complex through the action of downward percolating meteoric waters which were also responsible for formation of solution caverns and resulting collapse breccias.

This record provided courtesy of AGI/GeoRef.