Abstract

Ephemeral environments in which evaporites may be deposited can develop in reef-bank carbonate complexes. Resulting evaporite-bearing carbonates may develop porosity from solution of evaporites, and if brecciation has occurred before solution, resulting porosity will be of the breccia-interstitial or breccia-moldic varieties. Six criteria are presented for recognizing solution breccias. The Upper Devonian Fairholme Formation of western Alberta, and the Middle Devonian Presqu'ile and Pine Point Dolostones on the south shore of Great Slave Lake were developed as reef-bank carbonate complexes with evaporites. These subsequently developed evaporite-solution breccias that are recognized by the criteria presented. Evaporite-solution porosity may be common in carbonate complexes of the reef-bank origin, and may be areas in which both fluid hydrocarbons and metallic mineral deposits may have accumulated.

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