CECHY GEOCHEMICZNE UTWORÓW POGRANICZA BADENU I SARMATU W OTWORACH WIERTNICZYCH BUSKO (MŁYNY) PIG-1 I KAZIMIERZA WIELKA (DONOSY) PIG-1 Z PÓŁNOCNEGO OBRZEŻENIA ZAPADLISKA PRZEDKARPACKIEGO

Abstract

GEOCHEMICAL FEATURES OF THE BADENIAN–SARMATIAN BOUNDARY SERIES OF THE MIOCENE EVAPORITE OVERBURDEN IN the BUSKO (MŁYNY) PIG-1 AND KAZIMIERZA WIELKA (DONOSY) PIG-1 BOREHOLES , NORTHERN PART OF THE CARPATHIAN FOREDEEP

Abstract. The Middle Miocene evaporite horizon of the Carpathian Foredeep is overlain by thick marine clastic series. This lithologically monotonous complex records continuous sedimentation in most of the area and is of Badenian and Sarmatian age. The Badenian–Sarmatian boundary is ambiguous with respect to biostratigraphic subdivision and comprises a relatively long interval depending on locality within the Carpathian Foredeep. Chemostratigraphic analyses, comprising isotopic (carbon and oxygen) as well as major and trace elemental compositions of the Badenian–Sarmatian transition zone in the Busko (Młyny) PIG-1 and Kazimierza Wielka (Donosy) PIG-1 boreholes from the northern part of the foredeep, accordingly indicate that distinct geochemical changes occur at depths of c. 104 m and c. 136 m, respectively. The geochemical changes recorded in this transitional boundary zone reflect wider, regional changes in sediment material composition in both the regions, where the boreholes are located. These changes may be linked to the Badenian/Sarmatian chemostratigraphic boundary in the northern part of the Carpathian Foredeep.