Selection of the most appropriate method to determine the carbonate content for engineering purposes with particular regard to marls

Lamas‐Fernández, Francisco; Irigaray, Clemente; Oteo, C; Chacón, José Luis Torres

doi:10.1016/j.enggeo.2005.07.005

Cited by 62 publications

(23 citation statements)

References 7 publications

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“…Calcium carbonates (CaCO 3 %) of the uppermost humic layer were measured using the Calcimeter Bernard (Lamas et al, 2005). Finally, total iron content (in g/100 g) was quantified by X-ray fluorescence spectrometry on pressed powder pellets (XRF, Philips PW 2400).…”

Section: −1mentioning

confidence: 99%

Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains

et al. 2014

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Over recent decades, the number of floodplain restoration projects has increased worldwide. In Switzerland, several projects have been implemented to maintain or recreate ecological functions of floodplains. Despite this, little is known about the potential of floodplain soils to release and/or accumulate carbon. In alluvial soils, carbon storage is strongly influenced by fluvial dynamics, and therefore a better understanding of carbon fluxes and stocks in such settings is clearly needed. To evaluate the impact of river restoration on carbon storage in alluvial soils, we aimed to quantify and explain carbon storage and soil organic matter (SOM) stabilisation in the uppermost soil humic layer. Three floodplains were investigated showing each of them different levels of human disturbance: a near-natural section along the Rhine River, and both restored and embanked sections along the Thur River and Emme River. Carbon storage was determined by total organic carbon (TOC) stocks. SOM stabilisation was evaluated by considering the TOC content in different granulometric fractions (1000-2000 μm, 500-1000 μm, and 250-500 μm) and the macroaggregate formation, i.e. the abundance of water-stable aggregates (WSA) and the mean weight diameter of macro-aggregates (MWD). Our results show that the carbon storage and SOM stabilisation parameters were all related to soil properties such as clay, silt and total iron contents of the upper humic layer. Within each floodplain, carbon storage and SOM stabilisation parameters differed according to soil profile groups, thus reflecting a soil gradient evolution from bare alluvium soils to more stabilised soils and a hydric functioning (soils with hydromorphic features). In addition, river restoration showed various impacts on carbon storage and SOM stabilisation parameters depending on the floodplains, with a significant difference between embanked and restored sections for the Emme floodplain and no difference for the Thur floodplain.

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Section: −1mentioning

confidence: 99%

Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains

et al. 2014

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“…A modified Bernard calcimeter and the acid leaching method (LAMAS et al, 2005) were used indirectly to obtain the calcium carbonate content by measuring the CO2 gas volume produced from the reaction of hydrochloric acid with the carbonate of the whole original sample (rich in algae, halimeda, lithothamnium and rodolith nodules and its lithoclastic and bioclastic matrix). First, the volume (Vst) of saltsatured (saturated ?)…”

Section: Carbonate Content (%)mentioning

confidence: 99%

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

2010

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A B S T R A C TThe marine sediment samples collected from the northeastern Brazilian continental shelf, at water depths between 20 and 80 m, consisted mainly of sands with an almost total absence of gravel and granules. Medium, coarse and very coarse sand grains are mostly composed of halimeda, lithothamnium, rodoliths and bioclastic sands with a carbonate content varying between 77 and 96 %. The chemistry in general shows a decreasing content of Ca (86.1 %) >Si (6 %) > Cl (3.6 %) > Sr (0.8 %) > K (0.66 %) > S (0.62 %) > Al (0.6 %) > Na (0.55%) > Mg (0.43 %) > Fe (0.4 %) > P (0.2 %) > Br (0.04 %) in the samples. There was no correlation between CaCO3 and chemical contents and grain size with depth and biocomponents. With the exception of Sr of marine origin, all other elements (P, S, Br, Cl, Fe) are of continental origin. The lithothamnium of some offshore samples shows higher CaCO3 content, while Mg and Na are present only in halimedas. Bioclastic sands contain no Br, and silt and clay fractions are rare and characterize samples closer to the coast. These marine bioclastic granulates are of very pure biogenic calcium carbonates and are thus highly to be recommended for economic purposes. R E S U M OOs granulados marinhos, da Plataforma Continental do nordeste brasileiro, coletados de profundidades entre 20 e 80 m, são predominantemente areias cascalhosas constituídas de halimedas, litotames, rodolitos e areias bioclásticas, cujos teores de carbonatos variam de 77 a 96 %. A concentração média geral de elementos químicos na ordem decrescente é Ca (86.1 %) > Si (6 %) > Cl (3.6 %) > Sr (0.8 %) > K (0.66 %) > S (0.62 %) > Al (0.6 %) > Na (0.55 %) > Mg (0.43 %) > Fe (0.4 %) > P (0.2 %) > Br (0,04 %), independentemente da profundidade e tipo de bio-componente. Com exceção do Sr, que é de origem marinha, os demais elementos (P, S, Br, Cl, Fe) são de origem continental. Elementos como Mg e Na foram restritos às halimedas em apenas duas amostras, enquanto Br não foi detectado nas areias bioclásticas. Os maiores percentuais de frações finas (silte e argila) foram encontrados em amostras mais próximas à costa. Altas concentrações de carbonato de cálcio biogênico caracterizam esse depósito que pode ser considerado como recurso mineral marinho de importante valor econômico.

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“…To confirm the Rietveld data which are often discussed, two independent methods were used to quantify the carbonates in our samples. Bernard calcimetry is a volumetric standardized method (Afnor, NF P94-048) conventionally used on sediments and in civil engineering (e.g., Lamas et al, 2005). Five analyses of pure lime were used for calibration and three analyses were performed for each sample.…”

Section: Petrographic and Mineralogical Analysesmentioning

confidence: 99%

Underground dinosaur tracksite inside a karst of southern France: Early Jurassic tridactyl traces from the Dolomitic Formation of the Malaval Cave (Lozère)

Moreau

Trincal

André³

et al. 2018

IJS

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Abstract:Although underground dinosaur tracksites inside anthropic cavities such as mines or tunnels are well-known throughout the world, footprints inside natural karstic caves remain extremely rare. The Malaval Cave (Lozère, southern France) is well-known by speleologists for the abundance and the exceptional quality of acicular and helictite aragonite speleothems. Recent palaeontological prospecting inside this cave allowed the discovery of tridactyl dinosaur tracks.Here, a detailed study of theropod footprints was for the first time conducted inside a natural karstic cave, using photogrammetric imaging technique. Tracks from the Malaval Cave are located inside the "Super-Blanches" galleries. More than 26 footprints were identified. They are Hettangian in age (Lower Jurassic) and preserved as both in situ convex hyporeliefs and ex situ concave epireliefs. Tree morphotypes are distinguished, (i) "DilophosauripusKayentapus" morphotype, (ii) "Eubrontes" morphotype, and (iii) "Grallatorid" morphotype. Sedimentological and mineralogical analyses of the tracksite indicate that the depositional environment varied from periodically emergent subtidal to intertidal/supratidal flat marsh. This work highlights the great interest and importance of palaeoichnological prospecting in karst caves. This is particularly true for the Causses Basin where hundreds of natural cavities were reported by speleologists in the formations yielding dinosaur traces.

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Selection of the most appropriate method to determine the carbonate content for engineering purposes with particular regard to marls

Cited by 62 publications

References 7 publications

Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains

Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

Underground dinosaur tracksite inside a karst of southern France: Early Jurassic tridactyl traces from the Dolomitic Formation of the Malaval Cave (Lozère)

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