Nowsza mapa stosunków litofacjalnych w zagłębiu cechsztyńskim w Polsce

Józef Poborski



The first lithofacial map of the Polish Zechstein basin, drawn by the author in 1957, was published in a special geological atlas of Poland prepared for the celebrations of the 40th anniversary of the foundation of the Geological Institute of Poland (Wydawnictwa Geologiczne, Warsaw, 1960). In the years 1961-1970 subsequent revised and supplemented versions of that map were published (1962, 1964, 1969, 1970). The latest revised version, prepared in 1975, presents the fifth link in the evolutionary series of the image of the Polish part of the Zechstein salinary basin. Figure 1 shows highly generalized sketch of a map in the scale 1 : 1 000 000. The area of the basin is divided into 3 lithofacial fields (Fig. 1) for all stages of the Zechstein (Z1, Z2, Z3 and Z4). Concentric arrangement of the fields may be noted. Contrary to the previous views the central potassium-bearing field has no ramifications but there appears to be an additional potassium-bearing "Gdańsk basin" separated from the central basin by the Koszalin - Grudziądz structural element. In the latter there was deposited a layer of the oldest potassium salt (Z1) which was subsequently destroyed in the major part of the basin during the continental stage corresponding to the sedimentary gap in the stage Z2. The problem of the southern boundary of the basin still remains open. The Upper Permian rocks developed in non-salinary facies, subsequently eroded, streched further to the south-east in the areas presently covered by the Carpathian overthrust.

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