5th International Geologica Belgica Congress: 26–29 January 2016 – Mons, Belgium

Baele, Jean-Marc; Papier, Séverine; Devleeschouwer, Xavier; Dupont, Nicolas; Goderniaux, Pascal; Hennebert, Michel; Kaufmann, Olivier

doi:10.20341/gbcp.vol2

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…veniaut et al, 2007). Late Paleocene cannot be excluded, as climatic conditions were favorable to the setting up of deep weathering mantles (i.e., Baele et al, 2016;Demoulin et al, 2018;Quesnel et al, 2002;Yans, 2003). Erosion of the upper part of the saprolite and laterite could additionnaly explain the lack of any older cryptomelane ages (Demoulin et al, 2018).…”

Section: Weathering In the Ardennementioning

confidence: 99%

Genesis and 40Ar/39Ar dating of K-Mn oxides from the Stavelot Massif (Ardenne, Belgium): Insights into Oligocene to Pliocene weathering periods in Western Europe

Dekoninck

Monié

Blockmans

et al. 2019

Ore Geology Reviews

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Section: Weathering In the Ardennementioning

confidence: 99%

Genesis and 40Ar/39Ar dating of K-Mn oxides from the Stavelot Massif (Ardenne, Belgium): Insights into Oligocene to Pliocene weathering periods in Western Europe

Dekoninck

Monié

Blockmans

et al. 2019

Ore Geology Reviews

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“…These particular springs are rich in ferrous iron (Fe 2+ ), which oxidises with oxygen from the atmosphere to the less soluble ferric iron (Fe 3+ ) giving the waters a distinct orange-red colour. Bacterial mats are also commonly developed in the pouhons, causing biologicallydriven iron oxidation (Papier et al, 2016). Hydrogen sulphide often accompanies CO 2 resulting in the typical smell near the pouhons.…”

Section: Geology and Hydrogeology Of The Spa-stoumont-malmedy Areamentioning

confidence: 99%

A review of the geology and origin of CO2 in mineral water springs in east Belgium

Barros

Defourny

Collignon³

et al. 2020

Geol. Belg.

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Naturally CO2-rich mineral water springs (pouhons) in east Belgium occur in the context of the Rhenohercynian domain of the Variscan fold-and-thrust belt, mostly within the Cambro-Ordovician Stavelot-Venn Massif. The origin of the CO2 is still unclear, although different hypotheses exist. In this review study, we show pouhon waters are of the calcium bicarbonate type (~310 mg/l HCO3- on average), with notable Fe (~15 mg/l) and some Ca (~43 mg/l). Pouhon waters are primarily meteoric waters, as evidenced by H and O isotopic signature. The δ13C of CO2 varies from -7.8 to +0.8‰ and contains up to ~15% He from magmatic origin, reflecting a combination of carbonate rocks and mantle as CO2 sources at depth. Dinantian and Middle Devonian carbonates at 2–6 km depth could be potential sources, with CO2 generated by dissolution. However, carbonates below the Stavelot-Venn Massif are only predicted by structural models that assume in-sequence thrusting, not by the more generally accepted out-of-sequence thrust models. The mantle CO2 might originate from degassing of the Eifel magmatic plume or an unknown shallower magmatic reservoir. Deep rooted faults are thought to act as preferential pathways. Overall low temperatures of pouhons (~10 °C) and short estimated residence times (up to 60 years) suggest magmatic CO2 is transported upwards to meet infiltrating groundwater at shallower depths, with partial to full isotopic exchange with carbonate rocks along its path, resulting in mixed magmatic-carbonate signature. Although the precise role and interaction of the involved subsurface processes remains debatable, this review study provides a baseline for future investigations.

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Erosion Surfaces in the Ardenne–Oesling and Their Associated Kaolinic Weathering Mantle

Demoulin

Barbier

Dekoninck

et al. 2017

World Geomorphological Landscapes

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International audienceThis chapter deals with the long-term geomorphology of the Paleozoic Ardenne–Oesling massif of S Belgium and the landforms that currently attest the very long persistence and high resistance to erosion of landscape elements created as far back in time as the Lower Cretaceous in a region of predominantly continental regime and constant low to moderate elevation since the Permian. We first present recent results regarding the antiquity of kaolinic weathering mantles preserved in four sites on or close to the plateau surfaces characteristic of the Ardennian landscape, showing that they record at least three main weathering phases, namely in the Early Cretaceous (extending in the early Late Cretaceous), the Late Paleocene, and the Early Miocene. Then, having provided a working definition of the erosion surface and listed criteria helping recognize them in the landscape, we focus on the Hautes Fagnes massif, the highest NE part of the Ardenne–Oesling. We describe the geometric and sedimentary evidence that allow one to recognize a succession of four erosion surfaces formed during the Cretaceous and the Cenozoic and reconstruct the morphogenetic evolution of the area that responded to the variable interplay of the marine transgression-regression, climatic, and tectonic controls. Finally, we present the few estimates of long-term denudation rates available for the Ardenne massif, fission track and cosmogenic nuclide studies both suggesting Cenozoic denudation rates in the order of a few 10 m/Myr, and comment on their compatibility with field observations

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5th International Geologica Belgica Congress: 26–29 January 2016 – Mons, Belgium

Abstract: The Noqui peralkaline granite body (Matadi -Bas-Congo -DRC): a marker of 1.0 Ga lithospheric-scale triple junction updoming during long-lived Columbia breakup ..

Cited by 4 publications

References 14 publications

Genesis and 40Ar/39Ar dating of K-Mn oxides from the Stavelot Massif (Ardenne, Belgium): Insights into Oligocene to Pliocene weathering periods in Western Europe

Genesis and 40Ar/39Ar dating of K-Mn oxides from the Stavelot Massif (Ardenne, Belgium): Insights into Oligocene to Pliocene weathering periods in Western Europe

A review of the geology and origin of CO2 in mineral water springs in east Belgium

Erosion Surfaces in the Ardenne–Oesling and Their Associated Kaolinic Weathering Mantle

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