Utwory syluru z otworu wiertniczego Piotrowice I

Abstract

THE SILURIAN DEPOSITS IN BORE HOLE PIOTROWICE 1SummaryIn bore hole Piotrowice 1, situated about 6 km south-west from Zator, the Upper Silesian Coal Basin, a series of deposits have been found at a depth of 2851,0-3072,7 m under the sandstone-siltstone Lower Devonian Series. Despite a lack of any paleontological evidences these deposits can be referred to the Silurian only.They consist of black land dark grey day shales, claystones and siltstones, accompanied by arkose sandstones, fine-grained, medium-grained or inequigranular, revealing at places redeposited fragments of black shales (tabl. I-VI).The development of the deposits under consideration points to a shallow, near-shore zone of the marine sedimentary basin, affected by the adjacent continent.The lithological features of the formations in study, and the previous knowledge of the development of the Silurian transgression in South Poland allow us to assume that the Sub-Lower Devonian beds encountered by bore hole Piotrowice 1 can represent the Lower Silurian (Valentian).At a depth of 3058,1-3058,6 m an intrusion of alkaline quartz diabase has been encountered. This rock reveals, at the bottom contact with sandstone, some alternations showing abundant pyrite concentrations.