Mineralizacia galenowo-sfalerytowa piaskowców dolnego triasu z rejonu Koziegłów

Abstract

GALENA-SPHALERITE MINERALIZATION OF THE LOWER TRIASSIC SANDSTONES IN THE REGION OF KOZIEGŁOWY (SILESIAN-CRACOW AREA)SummaryGalena-sphalerite mineralization of the Lower Triassic sandstones has been found during reconnaissance- prospecting works to occur in the northern part of the Silesian Cracow area at several points (Fig. 1). By means of microscope and X-ray methods both composition and forms of the occurring mineralization have been determined (Tabs 1 and 2). Ore minerals – galena and sphalerite – fill in the intergranular space of sandstones frequently constituting their dominating cement (Tabs I-III).The corrosion of quartz grains at their contacts with the ore minerals may point to some reactions that take place between these phases at increased temperatures.Mineral paragenesis, found to occur in the Lower Triassic sandstone, is the same as that in the mineralized carbonate series of the zinc and lead deposits in the Silesian-Cracow region. The results of the laboratory examinations demonstrate that the mineralization encountered in the Lower Triassic formations, although related to lithologically different rocks, can be of the same origin as the mineralization in the carbonate formations of Middle Triassic age. Attention should be given to the role of gypsum beds that immediately rest on the sandstones at each sites, of the mineralization ascertained. A screening nature of these beds for the ascending hydrothermal solutions could have been of very considerable importance for the development of the mineralization.