Georadiochemical evidence to weathering of mining residues of the Mansfeld mining district,Germany |
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| Authors: | N Müller K Franke P Schreck D Hirsch H Kupsch |
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| Institution: | 1.Institut für Interdisziplin?re Isotopenforschung e.V,Leipzig,Germany;2.Ministry of Mines and Energy, Geological Survey,Windhoek,Namibia;3.Leibniz-Institut für Oberfl?chenmodifizierung e.V,Leipzig,Germany |
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| Abstract: | Mining heaps are used as archives for the investigation of weathering processes. Aim of this work was to investigate the different
weathering behavior of heap materials derived from Kupferschiefer mining with respect to environmental hazard. For this purpose,
Kupferschiefer and slag material of two heaps of different age were examined regarding to the radionuclide distribution and
geochemical composition. By measuring of the local dose rate, performing digital autoradiography and gamma spectrometry the
radiological load of the heaps and the heap materials was determined. The geochemical characterization of the samples was
performed by XRF, ICP–OES and ICP–MS. The results show a clear higher radionuclide load of the younger slag heap. A depletion
of chalcophile and lithophile elements in the older slag was determined. Apart from a homogeneous radionuclide distribution,
considerable radionuclide enrichments in fossil fragments could be proven. The results reveal a different weathering behavior
of slag material in comparison to the Kupferschiefer depending on the chemical binding of the elements on organic and inorganic
species. Natural organic matter as well as apatite in Kupferschiefer act as retention barrier for some metals. |
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| Keywords: | Kupferschiefer Mining Radionuclides Heavy metals Weathering |
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