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Abstract

Modern sedimentological analysis of environmental and depositional conditions can be applied not only to sediments, but equally successfully to ore deposits in sediments. Using these methods, the lead-zinc deposits of the Middle Triassic Alpine geosyncline have been studied. The ores were found to be restricted to few distinct beds of the enormous limestone-dolomite sequence, and characterized by a very distinct “special facies”. This facies development indicates multiform and repeated changes of the sedimentary conditions in time and space within a typical differentiated reef facies. Simultaneously, a submarine volcanism of varying activity appeared in the different regions of the Middle Triassic geosyncline.

The first enrichment of metal ions took place mainly in the synsedimentary stage at the sea floor, or was caused partly by ascending thermal solutions within the deeper units of the same sediment sequence. The quantitatively predominating vein- and replacement-ores are the products of diagenetic transformations which the ore-bearing sediments have undergone from the first stage of sedimentation up to the intensive folding during the Alpidian orogenesis. The importance of diagenetic transformations and the role of hydatogenous solutions for ore deposits in sediments are emphasized.

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