Oksford i kimeryd przedgórza Karpat polskich

Abstract

OXFORDIAN AND KIMMERIDGIAN IN THE FORELAND OF THE POLISH CARPATHIANSSummaryBased on numerous bore-hole sections of the Oxfordian and Kimmeridgian deposits found to occur under the Miocene ones in the Foreland area of the Carpathians, the author presents a syntetical picture of the region. On the one hand this picture completes the knowledge of the so far examined areas adjacent from the distribution the of facies and the other – it introduces new elements that concern the distribution of facies and the changes in thickness. Considering the palaeogeographical situation, the author emphasizes the close differentiation of the forms of primary sedimentation and those of structural nature (Fig. 3). Based on the lithology of limestones and on the participation of marls in the Oxfordian section the author distinguishes three main types of facies: Lublin type, Święty Krzyż type and Cracow type (Fig. 1), between the two latter ones also a transition zone of mixed Święty Krzyż facies with the influences of the Cracow one. The Święty Krzyż facies occurs within two areas: northern and southern. These are separated with the elevation Nieczajna, formed during the Bretonian movements, and revived in the periods of the later orogenies. In the central part of the western area strong dolomitization phenomena have been encountered in the Oxfordian and Kimmerddgian deposits (Figs. 1 and 2). This dolomitlization was due to the migration of magnesium leaches that flowed from the salt-bearing allochthonous Miocene formations in the surroundings of the Carpathian Flysch.