Widespread cementation induced by inflow of continental water in the eastern part of the Paris basin: O and C isotopic study of carbonate cements

Buschaert, Stéphane; Fourcade, Serge; Cathelineau, ‪Michel; Deloule, Étienne; Martineau, François; Ougougdal, Mohamed Ayt; Trouiller, Alain

doi:10.1016/j.apgeochem.2003.01.001

Cited by 40 publications

(38 citation statements)

References 18 publications

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“…The oxygen, hydrogen, and strontium isotopic compositions of present-day pore waters in the COx and adjacent units show a meteoric signature (Giannesini, 2006). Contrastingly, carbon, oxygen, and strontium isotope studies on carbonate (Ader and Javoy, 1998;Casanova et al, 1999;Buschaert et al, 2004;Lerouge et al, 2010a), suggest that virtually all diagenetic phases were precipitated from marine-derived waters. In Mesozoic limestones adjacent to the COx unit, carbon, oxygen, and strontium isotopes show that the late diagenetic calcites in vugs and fractures were precipitated from meteoric waters (Casanova et al, 2001;Vincent, 2001;Buschaert et al, 2004;Brigaud et al, 2010).…”

Section: Introductionmentioning

confidence: 87%

“…Organic matter study, fluid inclusion microthermometry and the thermal stability of clay indicated that COx unit has not undergone significant thermicity along geological times, paleotemperature never exceeding 50°C (Pellenard et al, 1999;Buschaert et al, 2004;Elion et al, 2005;Clauer et al, 2007). This maximum temperature was reached at the end of Cretaceous sedimentation (Guillocheau et al, 2000;Vincent et al, 2007).…”

Section: Tectonic Settingmentioning

confidence: 95%

“…Previous observations of carbonate bioclasts were performed in the framework of the study of iodine in carbonates (Claret et al, 2010;Lerouge et al, 2010b). The diagenetic carbonates are virtually all micritic calcite forming the cement of the rock but minor 10 lmsized euhedral calcite and dolomite grains are also dispersed in the sediment (Buschaert et al, 2004;Gaucher et al, 2004;Clauer et al, 2007). The dolomite content ranges between 2% and 9%, independently of the whole carbonate content of the rock (Pearson correlation coefficient = À0.01, p-value = 0.97, data after Gaucher et al, 2004).…”

Section: Petrography -Previous Workmentioning

confidence: 96%

“…Only two objects in the Oxfordian part of the COx unit, a tiny fracture (sample HTM2343/356.2m) and small bioclasts filled with calcite (HTM854/371m), exhibit d 18 O $ 20.9& to +23.7& SMOW, indicating a meteoric component with a d 18 O ranging between À6.8& and À2.5& for temperatures of 32-42°C (Buschaert et al, 2004).…”

Section: Isotopic Geochemistry -Previous Workmentioning

confidence: 99%

“…The oxygen and carbon isotopic compositions of micritic cement in the COx unit are those expected for marine calcite or sometime slightly depleted in 18 O (d 13 C $ +0.5& to +2.0& PDB and d 18 O $ +26.2& to +28.3& SMOW) (Buschaert et al, 2004). Only two objects in the Oxfordian part of the COx unit, a tiny fracture (sample HTM2343/356.2m) and small bioclasts filled with calcite (HTM854/371m), exhibit d 18 O $ 20.9& to +23.7& SMOW, indicating a meteoric component with a d 18 O ranging between À6.8& and À2.5& for temperatures of 32-42°C (Buschaert et al, 2004).…”

Section: Isotopic Geochemistry -Previous Workmentioning

confidence: 99%

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Mineralogical and isotopic record of biotic and abiotic diagenesis of the Callovian–Oxfordian clayey formation of Bure (France)

Lerouge

Grangeon

Gaucher

et al. 2011

Geochimica et Cosmochimica Acta

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The Callovian-Oxfordian (COx) clayey unit is being studied in the Eastern part of the Paris Basin at depths between 400 and 500 m depth to assess of its suitability for nuclear waste disposal. The present study combines new mineralogical and isotopic data to describe the sedimentary history of the COx unit. Petrologic study provided evidence of the following diagenetic mineral sequence: (1) framboidal pyrite and micritic calcite, (2) iron-rich euhedral carbonates (ankerite, sideroplesite) and glauconite (3) limpid calcite and dolomite and celestite infilling residual porosity in bioclasts and cracks, (4) chalcedony, (5) quartz/calcite. Pyrite in bioturbations shows a wide range of d 34 S (À38& to +34.5&), providing evidence of bacterial sulphate reduction processes in changing sedimentation conditions. The most negative values (À38& to À22&), measured in the lower part of the COx unit indicate precipitation of pyrite in a marine environment with a continuous sulphate supply. The most positive pyrite d 34 S values (À14& up to +34.5&) in the upper part of the COx unit indicate pyrite precipitation in a closed system. Celestite d 34 S values reflect the last evolutionary stage of the system when bacterial activity ended; however its deposition cannot be possible without sulphate supply due to carbonate bioclast dissolution. The 87 Sr/ 86 Sr ratio of celestite (0.706872-0.707040) is consistent with deposition from Jurassic marine-derived waters. Carbon and oxygen isotopic compositions of bulk calcite and dolomite are consistent with marine carbonates. Siderite, only present in the maximum clay zone, has chemical composition and d 18 O consistent with a marine environment. Its d 13 C is however lower than those of marine carbonates, suggesting a contribution of 13 C-depleted carbon from degradation of organic matter. d 18 O values of diagenetic chalcedony range between +27& and +31&, suggesting precipitation from marine-derived pore waters. Late calcite crosscutting a vein filled with chalcedony and celestite, and late euhedral quartz in a limestone from the top of the formation have lower d 18 O values ($+19&), suggesting that they precipitated from meteoric fluids, isotopically close to present-day pore waters of the formation. Finally, the study illustrates the transition from very active, biotic diagenesis to abiotic diagenesis. This transition appears to be driven by compaction of the sediment, which inhibited movement of bacterial cells by reduction of porosity and pore sizes, rather than a lack of inorganic carbon or sulphates.

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Section: Introductionmentioning

confidence: 87%

Section: Tectonic Settingmentioning

confidence: 95%

Section: Petrography -Previous Workmentioning

confidence: 96%

Section: Isotopic Geochemistry -Previous Workmentioning

confidence: 99%

Section: Isotopic Geochemistry -Previous Workmentioning

confidence: 99%

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Mineralogical and isotopic record of biotic and abiotic diagenesis of the Callovian–Oxfordian clayey formation of Bure (France)

Lerouge

Grangeon

Gaucher

et al. 2011

Geochimica et Cosmochimica Acta

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Effect of the local clay distribution on the effective electrical conductivity of clay rocks

2015

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The "local porosity theory" proposed by Hilfer was revisited to develop a "local clay theory" (LCT) that establishes a quantitative relationship between the effective electrical conductivity and clay distribution in clay rocks. This theory is primarily based on a "local simplicity" assumption; under this assumption, the complexity of spatial clay distribution can be captured by two local functions, namely, the local clay distribution and the local percolation probability, which are calculated from a partitioning of a mineral map. The local clay distribution provides information about spatial clay fluctuations, and the local percolation probability describes the spatial fluctuations in the clay connectivity. This LCT was applied to (a) a mineral map made from a Callovo-Oxfordian mudstone sample and (b) (macroscopic) electrical conductivity measurements performed on the same sample. The direct and inverse modeling shows two results. First, the textural and classical model assuming that the electrical anisotropy of clay rock is mainly controlled by the anisotropy of the sole clay matrix provides inconsistent inverted values. Another textural effect, the anisotropy induced by elongated and oriented nonclayey grains, should be considered. Second, the effective conductivity values depend primarily on the choice of the inclusion-based models used in the LCT. The impact of local fluctuations of clay content and connectivity on the calculated effective conductivity is lower.

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Fluid migration at the basement/sediment interface along the margin of the Southeast basin (France): implications for Pb–Zn ore formation

Aquilina

Boulvais

Mossmann³

2011

Miner Deposita

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Widespread cementation induced by inflow of continental water in the eastern part of the Paris basin: O and C isotopic study of carbonate cements

Cited by 40 publications

References 18 publications

Mineralogical and isotopic record of biotic and abiotic diagenesis of the Callovian–Oxfordian clayey formation of Bure (France)

Mineralogical and isotopic record of biotic and abiotic diagenesis of the Callovian–Oxfordian clayey formation of Bure (France)

Effect of the local clay distribution on the effective electrical conductivity of clay rocks

Fluid migration at the basement/sediment interface along the margin of the Southeast basin (France): implications for Pb–Zn ore formation

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