Próba zastosowania termoluminescencji w badaniach okruszcowanych skał węglanowych triasu śląsko-krakowskiego

Abstract

AN ATTEMPT TO USE THERMOLUMINESCENCE IN STUDIES ON ORE-BEARING CARBONATES OF THE TRIASSIC OF THE SILESIAN-CRACOW REGION Summary Natural thermoluminescence curves for Triassic carbonate rocks are interpreted assuming the existence of original energetic equillibrium in the rock massif (Figs. 2-3). This system of equillibrium had specific properties of original thermoluminescence modified and differentiated in the course of successive stages of physico-chemical alterations. All the anomalies in the distribution of thermoluminescence found around the rock massif evidence these changes when the original thermoluminescence pattern is noticeable. The results of micriscopic studies and measurements of the thermoluminescence of carbonate samples from three boreholes: 16 PB, 17 PB and 36 PB, made it possible to found the following regularities: (1) Distribution of original intensity of thermoluminescence maxima and the maximum temperatures are characteristic for particular lithostratigraphic horizons. (2) The intensity of thermoluminescence of samples representing the first generation of ore-bearing dolomites (epi I from the borehole 16 PB) is of the type of positive anomaly. The epigenetic character of the first generation of ore-bearing dolomites is confirmed by a high intensity of thermoluminescence of sample of dolomitized conglomeratic Gogolin limestones from the same borehole. The thermoluminescence properties of the epi I dolomites have been recognized as original on account of the overprinting of the effects of physico-chemical changes conditioning the origin of the epi II dolomites characterized by negative TL anomalies. (3) The TL anomalies negative in relation to the original TL, and high temperatures of the maxima from the zones of these anomalies are the indices of changes resulting from thermal mineralizing dolomite-sulphide solutions responsible for the origin of the ores. They indicate deposit zones and the zones of the second generation ore-bearing dolomites (epi II). (4) Levelling or extinction of the first maximum of TL curves, resulting from exhaustion of TL under natural suitable temperature conditions makes possible to use the TL phenomenon as a geothermometer. These conclusions, when confirmed by more complete evidence and the results of wider-scale studies on the nature of the thermoluminescence phenomena, may markedly contribute to the reconstruction of the genesis of zinc and lead ores of the Silesian-Cracow region.