Charakterystyka petrograficzna dolomitów kruszconośnych okolic Gołuchowic

Abstract

PETROGRAPHICAL RESEARCH OF MINARELIZED DOLOMITES IN VICINITY OF GOŁUCHOWICESummaryThe article deals with the petrographical description of rocks that make the horizon of mineralized dolomites and of ore minerals that are a component of this carbonate series in the vicinity of Gołuchowice.Four carbonate rock types have been distinguished: cryptogranular and microglanular dolomites, fine-grained and medium-grained dolomites, laminated dolomites and intraformational conglomerate. A carbonate rock classification has been presented on the basins of the diagram according to S. G. Wishniakov (Fig. 1). With the aid of the classification, calcareous and pure dolomites, and sporadically also calcareous-clayey and clayey dolomites, have been distinguished. Some rock samples underwent derivatographic analyses (Figs 2 and 3). Derivatograms demonstrated that in addition to the main minerals, i.e. dolomite and calcite, also little pyrite and ankerite occur.Both macroscopic and microscopic observations of ore minerals show that the main minerals are represented here by sphalerite and galena, subordinately by pyrite and marcasite. Cerussite is here a secondary mineral (Tabs I–IV). The ore minerals, make here various structures, mainly infillings of voids, and metasomaic, rarely dispersion ones. Structural-textural properties of sulphides prove (their origin from the real orthohydrothermal solutions.