Stavelot-Venn Massif; pouhon; black shales; uranium; ferruginous mud; Earth and Planetary Sciences (miscellaneous)
Abstract :
[en] Numer ous natur ally CO 2-rich mineral water springs, locally called pouhons, occur in the Stavelot-Venn Massif. These water springs show a particular composition with a high content of iron, manganese and lithium, and are characterised by a redorange colour resulting from iron hydroxide precipitation near the land surface. Radon measurements have shown that these ferruginous deposits are weakly radioactive. The Upper Cambrian black shales of the La Gleize Formation are also known to display radioactive anomalies. These rocks show enrichment in HFSE (Pb, U, Y, Ce, Zr, Ti, Nb) and are depleted in transition metals (Co, Ni, Cu, Zn). Specific minerals such as florencite-(Ce), monazite-(Ce), xenotime-(Y) and zircon have been identified and are probably at the origin of the radioactive anomalies. Uranium was gradually leached from these minerals, transported in solution, and finally concentrated in ferruginous muds. These muds are mainly composed of goethite (most often amorphous), residual quartz and calcite in some samples. The most probable hypothesis is that uranium is adsorbed in small concentrations on the goethite surface. On the other hand, the Ottré Formation (Ordovician) appears to be the main source of lithium, iron and manganese. Pouhon waters have therefore probably leached rocks of various mineralogy and chemical composition during their sub-surface circulation.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Depret, Martin ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Bruni, Yannick ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Dassargues, Alain ; Université de Liège - ULiège > Urban and Environmental Engineering
Defourny, Agathe ; Université de Liège - ULiège > Urban and Environmental Engineering ; Spadel S.A, Spa, Belgium
Marion, Jean-Marc ; Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab
Vanderschueren, Hyacinthe-Willy; Montefiore Institute, University of Liège, Liège, Belgium
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