Element and isotope geochemical investigations of the Kupferschiefer in the vicinity of “Rote Fäule”, indicating copper mineralization (Sangerhausen basin, G.D.R.)
1990; Elsevier BV; Volume: 85; Issue: 3-4 Linguagem: Inglês
10.1016/0009-2541(90)90012-v
ISSN1872-6836
AutoresJ. Hammer, F.W. Junge, H. J. Rösler, S. Niese, B. Gleisberg, G. Stiehl,
Tópico(s)Radioactive element chemistry and processing
ResumoBased upon extensive data on the elemental and isotopic compositions of Kupferschiefer of the Sangerhausen basin and according to results of trace-element and structural investigations of bitumen extracts trends of lateral and vertical distribution of various elements and genetic assertions are presented. Irregular positions of F, V, Se, Au and U in the correlation diagram, peculiarities of the lateral distribution of these elements, abnormally high elemental concentrations in the rocks and in the bituminous extracts as well as alterations discovered in the composition of hydrocarbon groups and their structures support the idea of an influx of oxidizing, metalrich waters moving through the “Rote Fäule” from the Rotliegendes basin into the Kupferschiefer sediment. Isotope geochemical investigations (carbon, nitrogen and oxygen of organic, carbonate and silicate fractions were carried out in order to characterize more precisely the conditions of sedimentation and the regime of diagenesis. The contrary δ13C curves of PbZn facies and “Rote Fäule” facies and the 13C enrichment in the organic matter of “Rote Fäule” can be explained by different redox conditions during sedimentation and/or diagenesis. Furthermore the decreasing δ18O-values of carbonates of the Rote Fäule also suggest an influx of meteoric waters. The results oppose a final syngenetic to early diagenetic fixation of the metal contents in Kupferschiefer areas in the vicinity of Rote Fäule. The established model of influx of metalliferous fluids, which arose from the Rotliegendes, is of local interest for element input and element redistribution.
Referência(s)