(5) gyp sum in which the d 18 O value of the H 2 O ranges be tween -8.7 and -6.9‰ (in ter preted as gyp sum with a mixed iso to pic com po si tion due to mix ing of wa ter from cap-rock and wa ter en riched in light iso topes of ox y gen: re cent me te oric wa ter or postglacial wa ter?, or as gyp sum formed in a warm in ter val when the ground wa ter was some what en riched in heavy iso topes of ox y gen if com pared with the ground wa ter at pres ent).

This paper presents the results of comprehensive mineralogical and petrographic studies conducted on evaporite rocks of the Zechstein (Upper Permian) period, extracted from boreholes drilled in the Mogilno diapir. Based on the research results, the occurrence of rock salts, potash-magnesium salts (kieseritic sylvinites), clayey salts, zubers, and anhydrites was identi ed. Those formations were assigned to cyclothems PZ-3 and PZ-2. No presence of evaporites belonging to cyclothems PZ-1 and PZ-4 were discovered. The recognized rocks were mainly composed of halite, sylvine, kieserite and anhydrite. Smaller quantities of polyhalite, kainite, carbonates and clayey minerals were also found. A number of accessory minerals were identi ed, with their salt rock contents from several to about several tens of ppm

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