Badania geochemiczne wulkanitów Gór Swiętokrzyskich

Abstract

GEOCHEMICAL EXAMINATION OF VULCANITES IN THE ŚWIĘTY KRZYŻ MOUNTAINSPart I: LamprophyresThe object of this research are lamprophyre rocks derived from bore-holes Zielonka, Zaldów, Podkranów, Sieraków, and a test pit at Podkranów, all situated in the Święty Krzyż Mountains. These rocks form dykes in  the shales which likewise were investigated. In the rocks mentioned the author determined the content of Ni, Cr, Co, Pb, Cu, Zn, Ba and Sr by means of polarographic, colorimetric and spectrographic analyses. He also examined the CO2 content and the radioactivity a of these rocks.The samples used for these analyses were of approx. 1 kg weight each, representing the average rock composition. The examinations revealed the tested lamprophyre samples from the various bore-holes to contain, at an average: Ni-0.009-0.018%, Cr-0.007-0.023%, Pb-0.011-0.024%, Cu-0.026-0.045%, Ba-0.048-0.170%, Sr-0,033-0.075%. The CO2 content oscillates in the samples between 0.00%-33.36%.The author's examinations show that the changes in content of Ni, Co and Cr are apparent and were caused by processes of carbonatization (Figs. 1, 2).In the tested rocks, strongest appears a sulphide and calcite-barite mineralization. We are facing here at least two phases of this mineralization. In close vicinity to the lamprophyres this mineralization lose their importance; the mineralizing solutions, making use of tectonic fissures, were probably carried off a considerable distance; still, in the total mass of surrounding rock is the influence at the mineralizing solutions is but small. The true geochemical picture of the lamprophyres is much obscured by pulsations of the solutions of the mother lamprophyre rocks and by their assimilation of surrounding rocks.