Dickit towarzyszący przejawom okruszcowania w Górach Świętokrzyskich

Abstract

DICKITE MINERALIZATION IN THE ŚWIĘTOKRZYSKIE MTS.SummaryDuring the geological research conducted in the area of the Palaeozoic massif of the Święokrzyskie Mountains, new sites of dickite occurrence have recently been ascertained. In this area, dickite has been reported by H. Gruszczyk and J. Kubisz (1960), who observed it to occur at one point only (Wiśniówka Mała).The new dickite occurrence sites have been investigated in drill cores from 10 bore holes, and in a quarry at Wiśniówka Duża (Fig. 11). Five samples of this mineral underwent detailed and complex examinations using X-ray-structural methods (Tabs. 1–3, Fig. 2), DTA method (Fig. 3), and petrographic methods. The dickite has been found to occur rather with an admixture of kaolinite. It has been ascertained that this mineraloization is of epigenetical nature, and may be observed as white, fine-foliaceous coatings in the network of clivage and joint fractures in the Old-Palaeozoic sandstones, siltstones and schists, rarely also in carbonate rocks (Łagów 1). The age of these rocks ranges from (Lower Cambrian to Middle Devonian. As a rule, the dickite is accompanied by a characteristic mineral assemblage that consists of quartz, siderite, dolomite, calcite, Zn, Pb, Cu, and Fe sulphides, and barite (Fig. 5). Due to the intense regional metallogenic studies conducted by Z. Rubinowski (1966, 1970), the authors are of the opinion that this mineralization is a manifestation of post-Variscan hydrothermal (sensu lato) lead-zinc-barium formation. The geological occurrence conditions of this mineralization, mineral paragenesis, and depth of extent of these manifestations (in the bore hole Barwinek 11 – down to a depth of about 800 m below the earth surface), exclude any hypergenic (weathering) or diagenetik source of dickite, previously accepted by H. Gruszczyk and J. Kubisz (1960) in relation to the manifestations ascertained at Wiśniówka Mała.