Wykształcenie i tektonika utworów solnych cechsztynu w wysadzie solnym Góra koło Inowrocławia w świetle wyników kompleksowych badań geochemiczno-litologicznych w profilach wybranych otworów wiertniczych

Abstract

Characteristics and tectonics of Zechstein salt rocks of the Góra salt diapir near Inowrocław on the basis of geochemical-lithological study of selected borehole sections.A b s t r a c t . Detailed macroscopic profiling of salt cores from selected wells drilled in the Góra salt diapir (central Poland; Fig. 1, 2) and analyses of bromine content made it possible to define and characterize lithostratigraphic units of the Zechstein (Upper Permian) succession (Fig. 3, 4). Interpretation of relations between the units identified in the studied well sections allowed the first schematic reconstruction of internal structure of top part of the salt trunk (Fig. 5). The principal idea of this reconstruction is probable origin of the Góra diapir as a salt trunk with a recumbent fold at the top (Fig. 6A). Subsequent uplift of the diapir and erosion resulted in removal of significant part of younger salt deposits so only those squeezed into the salt trunk interior escaped the erosion (Fig. 6B). Models of internal structure of salt diapirs are of remarkable practical value as they facilitate proper location of the mining works (e.g. leaching wells, galleries, chambers and caverns) and prediction of possible gas and water hazards.