Abstract
In the western part of the Rheinisches Schiefergebirge geochemical investigations were carried out on Paleozoic black shales and carbonates in the Aachen region. Primary and secondary metal distributions were determined in selected units of sedimentary rocks by XRF-analysis and in stream sediments by AAS-analysis. The primary geochemical pattern and the results of geological studies reveal that Frasnian (Upper Devonian) black shales and nodular limestones were deposited in a restricted environment under euxinic conditions of a swell and basin facies. Black shales and nodular limestones are enriched in Zn and Cu resp., possibly indicating stratiform sulphide mineralization. Geochemical anomalies in stream sediments with increased values of Pb, Zn, Cd, Cu, Co, and Ni were found in areas of Lower Paleozoic sedimentary rocks and associated acid intrusives which are known to contain low grade sulphide mineralization of the “porphyry copper-type”.
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