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Calcite pseudomorphs after evaporates from the Muschelkalk (Middle Triassic) of the Holy Cross Mountains (Poland)

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Bodzioch A.

Geologos

2003

tom Vol. 6

169--180

Pseudomorphs after sulphate minerals, together with accompanying phenomena, are the only evidence of evaporites in the Muschelkalk of the Holy Cross Mts. They appear as geodes or full-filled nodules built of coarse-crystalline calcite, and their after-evaporite origin have been interpreted on the ground of lithological, petrographical and geochemical characteristics. Evaporitic conditions of sedimentation are indicated mainly by remnants of sulphate minerals occurring commonly in the geodes, and by remnants of dolomite in the host rocks. Dissolution of sulphates, evidenced by collapse breccias, pseudomorphs, and pervasive calcitization of the geodes-bearing horizons, took place in consequence of fresh water influx, which is suggested by elemental and isotopic data.