Modelling of the ion-exchange properties and indirect determination of the interstitial water composition of an argillaceous rock. Application to the Callovo-Oxfordian low-water-content formation

Motellier, S.; Ly, J.; Gorgeon, L.; Charles, Y.; Hainos, D.; Meier, Patrick; Page, J. Bryan

doi:10.1016/s0883-2927(03)00049-0

Cited by 43 publications

(39 citation statements)

References 13 publications

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“…The CEC was fitted to reach a good agreement between experimental and calculated curves. The initial value was 200 meq kg À1 (Roussel, 2001) and the fitted value was 142 meq kg À1 , which corresponded to that measured in the present work and was in good agreement with other published values (Motellier et al, 2003;Leroy et al, 2007) accepting that characteristics such as CEC may vary somewhat with the sampling point. The CEC value is smaller than the exchangeable Ca 2þ concentration, because some Ca was contained in minerals.…”

Section: Modellingsupporting

confidence: 91%

Eluto‐frontal chromatography to simulate chemical weathering of COx by low‐molecular‐weight organic compounds and early pedogenesis processes

Scholtus¹,

Leclerc²,

Donato³

et al. 2009

European J Soil Science

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Excavation of geological materials by civil engineering operations generates fresh parent rocks that are transferred from the deep layers to the surface in a very short time. Thus they are exposed to pedogenetic factors. Prediction of the characteristics and functioning (e.g. plant support and water filter) and impacts of the newly formed soils requires the knowledge of the pedogenetic processes affecting the parent materials (i.e. weathering, transport and neoformation). Reactive transport is here used to assess weathering processes of geological materials produced from the excavation of an underground laboratory in the Callovo-Oxfordian (COx) layer, subsequently disposed of on the soil surface and covered with plants. The COx layer (c. 150-100 million years) is mainly composed of quartz, calcite, dolomite and argillite (complex mixtures of phyllosilicates). COx samples collected between À456.6 and À482.5 m were submitted to eluto-frontal chromatography experiments in the presence of simple organic molecules exhibiting a range of chemical reactivity (i.e. acetate, oxalate, histidine and EDTA). Breakthrough curves of compounds contained in the COx material and mathematical modelling allowed the identification of the major chemical reactions taking place during weathering. Results showed that acidic and complexing organic compounds induced the partial solubilization of minerals and in some cases secondary precipitations. The early pedogenesis processes induced a strong release of minerals (Na, Ca, Mg) and transformation of clay minerals. Further evolution of COx material is dependent on the presence of carbonates, leading to carbonated soils such as Calcosols. Reactive transport experiments showed that early pedogenetic processes are of most importance as they produced strong changes in the parent material composition and released significant amounts of solutes into the soil solution.La chromatographie éluto-frontale pour simuler l'altération chimique du COx par des composés organiques de faible masse et les premiers stades de la pédogénèse Résumé Les mate´riaux ge´ologiques excave´s par les ope´rations de ge´nie civil constituent les roches me`res brutalement expose´es aux facteurs pe´doge´ne´tiques ge´ne´rant des sols technologiques, i.e. Technosols. La pre´diction de la composition, du fonctionnement (e.g. support de ve´ge´tation, qualite´des eaux) et de l'impact de ces nouveaux profils ne´cessitent de connaıˆtre les processus pe´doge´ne´tiques qui prennent sie`ge, notamment l'alte´r-ation, le transport et la ne´oformation. Le transport re´actif, de´rive´du ge´nie des proce´de´s et en particulier de la chromatographie, est ici utilise´pour pre´dire l'alte´ration de mate´riaux ge´ologiques issus de la construction d'un laboratoire souterrain dans le Callovo-Oxfordien (COx), de´pose´s a`la surface et soumis a`la ve´ge´-talisation. Les roches de la couche du COx (-150 a`-100 millions d'anne´es) contiennent principalement du quartz, de la calcite, de la dolomite et des argilites, me´lange de phyllosilicates. Des e´...

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Section: Modellingsupporting

confidence: 91%

Eluto‐frontal chromatography to simulate chemical weathering of COx by low‐molecular‐weight organic compounds and early pedogenesis processes

Scholtus¹,

Leclerc²,

Donato³

et al. 2009

European J Soil Science

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“…Another point is the nature of the clays. In the Super‐Sauze and Draix‐Laval shales, the part of inter‐stratified illite/smectite is very low compared with the proportion measured in other clay‐shale environment (e.g., Bure and Mont Terri sites; Motellier et al, ; Pearson et al, ) where these dominant phases prove to have the highest cation exchange capacity. For these reasons, the modelling strategy in this study is focused on irreversible reactions.…”

Section: Methodsmentioning

confidence: 91%

“…This pyrite can be in the bedrock or unweathered blocks within the landslides, while secondary minerals are widespread within the unsaturated zone.3.5 | Geochemical modelling3.5.1 | Modelling strategyThe chemical composition of water resulting from water-rock interaction is due to complex processes that can be described in terms of (a) mass transfers through the rock matrix and fractures, (b) reversible ions exchange reactions or irreversible minerals dissolution, and (c) precipitation of new mineralogical phases. In the case of non weathered Callovo-Oxfordian shales, several studies used geochemical modelling to estimate pore water chemical composition(Motellier et al, 2003;Gaucher et al, 2006;De Combarieu et al, 2007;Appelo et al, 2008;Beaucaire et al, 2008;Tournassat et al, 2008) Pearson et al (2011). reviewed the assumptions used in geochemical modelling in such contexts.…”

mentioning

confidence: 99%

Groundwater—Surface waters interactions at slope and catchment scales: implications for landsliding in clay‐rich slopes

Marc

Bertrand

Malet

et al. 2016

Hydrological Processes

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Understanding water infiltration and transfer in soft-clay shales slopes is an important scientific issue, especially for landsliding. Geochemical investigations are carried out at the Super-Sauze and Draix-Laval landslides, both developed in the Callovo-Oxfordian black marls, with the objective to define the origin of the groundwater. In situ investigations, soil leaching experiments and geochemical modeling are combined to identify the boundaries of the hydrological systems. At Super-Sauze, the observations indicate that an external water flow occurs in the upper part of the landslide at the contact between the weathered black marls and the overlying formations, or at the landslide basement through a fault network. Such external origin of water is not observed at the local scale of the Draix-Laval landslide but is detected at the catchment scale with the influence of deep waters in the streamwater quality of low river flows. Hydrogeological conceptual models are proposed emphasizing the role of the interactions between local (slope) and regional (catchment) flow systems. The observations suggest that this situation is a common case in the Alpine area. Expected consequences of the regional flows on slope stability are discussed in term of rise of pore water pressures and physicochemical weathering of the clay shales

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“…For Boom Clay pore water, Beaucaire et al (2000) proposed a model with control of K and Na by detrital feldspar minerals (Na-albite and K-feldspar) without ion exchange reactions. The model developed by Motellier et al (2003) for the Callovo-Oxfordian (COx) formation included multi-site exchange reactions but, unfortunately, did not consider sulphate anions, one of the major solutes in the pore waters. Thus, the model results cannot be compared with measured in situ water chemistry.…”

Section: Towards a Model Without Expert Judgement Parametersmentioning

confidence: 99%

A robust model for pore-water chemistry of clayrock

Gaucher

Tournassat

Pearson³

et al. 2009

Geochimica et Cosmochimica Acta

187

157

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Modelling of the ion-exchange properties and indirect determination of the interstitial water composition of an argillaceous rock. Application to the Callovo-Oxfordian low-water-content formation

Cited by 43 publications

References 13 publications

Eluto‐frontal chromatography to simulate chemical weathering of COx by low‐molecular‐weight organic compounds and early pedogenesis processes

Eluto‐frontal chromatography to simulate chemical weathering of COx by low‐molecular‐weight organic compounds and early pedogenesis processes

Groundwater—Surface waters interactions at slope and catchment scales: implications for landsliding in clay‐rich slopes

A robust model for pore-water chemistry of clayrock

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