ASGP (2003), vol. 73: 139-143

ANOMALOUS DRILL-CORE PARTING IN THE SEDIMENTS OF THE UPPER SILESIAN BASIN

Alena KOŽUŠNÍKOVÁ (1), Věra FIALOVÁ (1) & Ivan HOCH (2)

1) Institute of Geonics AS CR, Studentská 1768, 70800 Ostrava-Poruba, Czech Republic, e-mail: kozusnik at ugn.cas.cz
2) Mining Exploration and Safety a.s., Ostrava-Karviná Mines, Rudé armády 637, 73921 Paskov, Czech Republic, e-mail: Ivan.Hoch at dpb.cz

Kožušníková, A., Fialová, V. & Hoch, I., 2003. Anomalous drill-core parting in the sediments of the Upper Silesian basin. Annales Societatis Geologorum Poloniae, 73: 139-143.

Abstract: Anomalous jointing of drillcores is sometimes observed in prospect boreholes in the Upper Silesian basin. The drillcore is jointed into discs, slices or porringers that are not resemblant to natural jointing. This occurs in various types of sediments, but especially in brittle rocks. Orientation of jointing planes is perpendicular to the borehole axis and does not depend on the distance from the front of the core run. Anomalous jointing reflects locally increased stress in the layer.