Profil litologiczno-surowcowy astartu i kimerydu z rejonu Kutna

Abstract

LITHOLOGICAL-RAW MATERIAL PROFILE OF THE ASTARTIAN AND KIMMERIDGIAN DEPOSITS IN THE REGION OF KUTNOSummaryThe article deals with the raw-material characteristics of the carbonate Upper Jurassic formations found to occur at a depth down to 110 m. The examination of the deposits documented in this region in a spatial scheme allowed the author to make the analysis of deposits within the area under consideration, and to show the course of the future prospecting works according to the requirements of the consumers. The mineral raw material prognoses have been based on a subdivision of the here occurring carbonate formations into three main lithological varieties, differing in their chemical properties: limestones, marly limestones and marls. The works have been concentrated within an area penetrated by drillings, the sections of which have also thoroughly been examined chemically. Sections showing lithological varieties have been worked out for 36 drillings; these show also appropriate complexes of the individual mineral raw materials (Table 1). These data have been a basis for the construction of the synthetic lithological-raw material section (thickness 322 m) presenting both lithological beds and raw material complexes characterized in respect of their chemical composition (Fig. 1) and their stratigraphical position (Tab. 2). Both the structures and textures of the main lithological types are presented on photographs (Tables I-IV). The raw material complexes are shown in a horizontal distribution on the geological-raw material map (Fig. 2) and in the vertical extent on the cross sections (Figs 3 and 4). Tables 3-6 present the weighted means of the chemical composition for the distinguished lithological strata and for the raw material complexes, calculated on the basis of 255 seven-component chemical analyses. The mineral composition of the individual lithological varieties is shown in Table 7. Some suggestions concerning the complex use of the mineral raw materials in the region in study, by both lime and cement industries, result from the quantitative relations between the mineral raw materials here considered, within the complexes and in the whole area of study (Fig. 5).