Podwodne przejawy denudacji chemicznej wysadu solnego Rogóźno na przykładzie fragmentu koryta Moszczenicy w Giecznie (powiat zgierski)
Underwater chemical denudation expressions of the Rogóźno salt dome on the example of the Moszczenica riverbed stretch in Gieczno

Summary/Abstract: The article presents the results of a study of salinity in the Moszczenica hyporheic zone in the stretch overthe Rogóźno salt dome and a review of research hypotheses intended to explain the cause of this peculiar geochemical phe-nomenon. The economic history of the Rogóźno-Gieczno area does not indicate the existence of a tradition of salt exctraction.These allows us to assume that geogenic salinity, which is evidence of leaching of the salt body and denudation of the gypsumcap, was revealed in the 20th century as a result of geological exploration works. The fact of the presence of saline waters inthe immediate vicinity of the riverbed creates a favourable research area for investigating the relations between river andhyporheic waters in the special conditions of wide availability of the chloride ion as the indicator element in the aquatic envi-ronment. Annual research did not show a clear relationship between the variability of hydrological and hydrogeological con-ditions and the condition of the hyporheic zone. However, its provided the basis for distinguishing two zones in the examinedpart of the riverbed bottom that responded differently to the inflow of saline deep waters. It was assumed that the salinity ofthe environment around the riverbed was caused by the ascension of saline water from the Jurassic formations which abut tothe salt diapir.

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