Nowy obraz stosunków litofacjalnych w zagłębiu cechsztyńskim w Polsce

Abstract

NEW OUTLINE OF LITHOLOGICAL RELATIONS IN THE ZECHSTEIN BASIN OF POLAND

Summary

Since 1956 the present author has carried on studies to elaborate a synthetical geological picture of the Zechstein salt basin of Poland. It seems that a general lithofacial map and respective cross sections are here the best picture required. The first lithofacial maps of the Zechstein basin of Poland were published by the present, author in 1960 and 1962, as the works of the Geological Institute. In 1967, he drew a new such a map on the scale 1: 1 000 000. The map presented in this article (Fig. 1) is a generalized sketch of the original. The known facial regularity in evaporate sedimentation was a basis to construct the map. Moreover, facial changes were, for the first time, presented as to the Lower Zechstein (Zl + Z2), and the Upper Zechstein (Z3 + Z4) separately. The new map here considered presents more precisely the boundaries of the Zechstein basin in Poland, according to the results of new drillings. These results have proved that the Zechstein daposits laid down in a lagoon+continental macrofacies stretch farther southwards, and in several arms continue in this direction under the Carpathians. In the northern part of the country, i.e. in the Pomeranian area, a structural element Koszalin - Chojnice - Tuchola has been defined cartographically. This element must have been a land massif at the Lower and Upper Permian boundary, a massif built up of the older Palaeozoic formations, probably piled up along the Late Caledonian and Early Variscan flexure North Rügen - Koszalin – Grudziądz (according to W. Pożaryski and H. Tomczyk). For the first time there is shown also a dismembering of the Zechstein sedimentation owing to a structural element Koszalin - Tuchola. In both the lower (Zl + Z2) and upper (Z3 + Z4) divisions of the Zechstein, the distribution of facial zones is observed to be concentric in relation to the central field. It appears that the new map will be helpful in the regional differentiation of the vertical sections of the Zechstein formations.