Christophe Cloquet

French National Centre for Scientific Research | CNRS · Centre de recherches pétrographiques et géochimiques (CRPG)

The Orne River, a tributary of the Moselle River, was highly impacted by industrial activities for more than one century. Land use along the Orne River is highly contrasted, with local specificity from its source to its junction with the Moselle River. The intense industrial activity left behind tons of steelmaking wastes (SMW) on the land surface...

Metal stable isotopes (e.g., Zn, Cd, and Cu) have been used to track metal sources in different types of hydrothermal systems. However, metal isotopic variations in sulphides could be triggered by various factors such as mineral precipitation and fluid mixing. Thus, tracking the metal sources of hydrothermal systems is still a big challenge for met...

This présentation focused on the geochemical tools (including chemical composition and fingerprints) of suspended particulate matter in the Orne River during a flood event.

We present here Rb and Sr mass fractions and 87Sr/86Sr compositions for four reference materials (RM) obtained from the Service d’Analyse des Roches et des Minéraux (SARM) in Nancy, France: Mica‐Mg, Mica‐Fe, GL‐O and FK‐N. These four RMs have different chemical compositions spanning the range of those of most K‐bearing feldspars and micas, making t...

The use of lead, strontium and neodymium isotope signatures in ancient glass is developing rapidly and allows the identification of the geological origin of the different raw materials entering the composition of the glass. This approach has been recently applied to glass manufactured in India to define the possible regions of production. Three gla...

The Isotrace CNRS workgroup in collaboration with National Research Council of Canada has characterized a number of trace element mass fractions and isotope ratios currently not certified in AQUA-1 natural drinking water reference material (NRC Canada). This survey further expands the use of this material as a tool for environmental quality control...

Copper-base drums are among the most iconic artefacts of mid-late 1st millennium BC Southeast Asia and southern China, and more specifically of the Vietnamese Đông Sơn culture and the Yunnanese Dian culture. The wide distribution of these drums, in public museums and private collections, renders their technical and stylistic study difficult, and th...

The Sichuan–Yunnan–Guizhou (SYG) Zn–Pb metallogenic zone in SW China contains >400 carbonate-hosted hydrothermal Zn–Pb deposits. Some of these, such as the Huize, Tianbaoshan, and Daliangzi deposits, are super-large deposits with significant reserves of Cd, Ge, and Ag. However, the sources of these metals remain controversial. This study investigat...

Objectif Les cas de saturnisme en France sont devenus rares. Nous rapportons le cas d’un saturnisme infantile pour lequel la comparaison de profils isotopiques du plomb et de ratios élémentaires entre les prélèvements biologiques et environnementaux a permis d’identifier la source de contamination. Historique du cas Une fillette de 8 ans au compor...

In order to carry out strontium isotope analysis, glass artifacts from South Asia were sampled with portable laser (pLA), a relatively novel sampling technique, that leaves damages invisible to the naked eye. Subsequently, thermal ionization mass spectrometry (TIMS) was used to obtain strontium isotope ratios after sample dissolution and separation...

The temporal coincidence between the Late Permian mass extinction (LPME) and the emplacement of Siberian Traps basalts suggests a causal link between the two events. Here, we discuss stratigraphic changes of organic and inorganic (including isotopic) geochemical properties of marine sediments across the Permian-Triassic boundary (PTB) in the Hovea-...

Aims. Rinorea cf. bengalensis is a Ni hyperaccumulator which occurs in Sabah (Malaysia), on Borneo Island, that is able to accumulate considerable amounts of Ni and influences the Ni cycle in surface soil layers, both in terms of Ni concentration and Ni isotopic composition. In this study, the biogeochemical processes underpinning Ni isotopic fract...

Background In France, the prevalence of childhood lead poisoning is becoming rare since the avoidance of lead in paints in 1949 and the gradual replacement of water pipes. Chronic lead toxicity is well known and is well correlated to blood lead concentration. Aim Here we report a case of severe lead poisoning occurring in a young female child with...

The levels and speciation of dissolved, particulate and gaseous Se have been measured in five thermokarst ponds in a sporadic and discontinuous permafrost region of northern Québec (Canada) during summer oxygen stratification. Evolution of Se concentrations with depth was investigated in sediment cores collected in three different ponds. The potent...

The application of lead isotope-based provenance analysis in Southeast Asia over the last decade has strongly suggested a central role was played by the Lao PDR in regional copper production exchange networks for approximately 1500 years. The Vilabouly Complex, in central Lao's Savannakhet Province, has revealed major copper mining and smelting sit...

The natural river water reference material SLRS‐6 (NRC‐CNRC) is the newest batch of a quality control material routinely used in many international environmental laboratories. This work presents a nine‐laboratory compilation of measurements of major and trace element mass fractions and their related uncertainties, unavailable in the NRC‐CNRC certif...

A 157-cm-long sediment core from Longemer Lake in the Vosges Mountains of France spans the past two millennia and was analyzed for trace metal content and lead isotope composition. Trace metal accumulation rates highlight three main input phases: Roman Times (cal. 100 BC–AD 400), the Middle Ages (cal. AD 1000–1500), and the twentieth century. Atmos...

The Erta Ale rift segment, North Afar, is regarded as the most mature rift part within the entire Afar rift system. Very little is known about its deformation history because of limited exposures of geological records in its inner floor, except volcanics of the Erta Ale chain, and the poorly-known Red Beds series along the flanks of the depression....

During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and isotopes. To establish Zn geochemical cycling patte...

The pollution of natural waters and sediments with metals derived from acid mine drainage (AMD) is a global environmental problem. However, the processes governing the transportation and transformation of AMD metals such as Cd in mountainous areas are poorly understood. In this study, the Cd isotopic composition and Cd concentration of river water...

Iron mining activities in the Bruche valley (Vosges Mountains, France) date historically from the Roman period to the mid-nineteenth century. The geochemical and palynological study of a core from the peat bog of Le Champ du Feu allows highlighting impacts of these activities over the past millennium. Trace metal contamination is recorded for lead...

Zinc (Zn)-Lead (Pb) deposits are generally rich in cadmium (Cd), and the weathering of sulfide minerals in such deposits results in large releases of Cd into the environment. From an environmental and public health standpoint, understanding Cd sources and cycling is critical to identifying potential hazards to humans. In this study, the Cd isotope...

Cadmium (Cd) isotopic compositions in seawater are important parameters for tracing the biogeochemical cycling of Cd in modern oceans and may be used as a direct proxy for nutrient utilization by phytoplankton and an indirect proxy for primary productivity. In this study, we measured the stable Cd isotope ratios (δ 114 Cd) of marine sedimentary car...

We present a complete dataset for major, minor and trace elements in wolframite ([Fe,Mn]WO4) based on the example of several peribatholitic hydrothermal W deposits located in the Variscan French Massif Central (FMC). The wolframite samples were characterized down to the micrometer scale by combining scanning electron microscopy observations and in...

High-precision cadmium (Cd) isotope compositions are reported for sphalerite, galena, and smithsonite from the Fule Zn–Pb–Cd deposit, a typical Mississippi Valley-type deposit in Southwest China. Dark sphalerite has lighter δ114/110Cd values (0.06 to 0.46 ‰) than light sphalerite (0.43 to 0.70 ‰), and the Cd in galena is primarily in the form of sp...

Based on our previous field survey, we postulate that the pattern and degree of zinc (Zn) isotope fractionation in the Zn hyperaccumulator Noccaea caerulescens (J. & C. Presl) F. K. Mey may reflect relationship between Zn bioavailability and plant uptake strategies. Here, we investigated Zn isotope discrimination during Zn uptake and translocation...

Based on our previous field survey, we postulate that the pattern and degree of zinc (Zn) isotope fractionation in the Zn hyperaccumulator Noccaea caerulescens (J. & C. Presl) F. K. Mey may reflect a relationship between Zn bioavailability and plant uptake strategies. Here, we investigated Zn isotope discrimination during Zn uptake and translocatio...

We have measured the concentration, isotopic composition and thermal release profiles of Mercury (Hg) in a suite of meteorites, including both chondrites and achondrites. We find large variations in Hg concentration between different meteorites (ca. 10 ppb to 14,000 ppb), with the highest concentration orders of magnitude above the expected bulk so...

Lead-zinc deposits are often difficult to classify because clear criteria are lacking. In recent years, new tools, such as Cd and Zn isotopes, have been used to better understand the ore-formation processes and to classify Pb-Zn deposits. Herein, we investigate Cd concentrations, Cd isotope systematics and Zn/Cd ratios in sphalerite from nine Pb-Zn...

We have prepared a large volume of pure, concentrated and homogenous zinc standard solution. This new standard solution is intended to be used as a primary reference standard for the zinc isotope community, and to serve as a replacement for the nearly exhausted current reference standard, the so-called JMC-Lyon Zn. The isotopic composition of this...

We report on the chemical and Pb isotopic compositions of epiphytic lichens collected from small tree branches in the urban area of the city of Metz (NE France). Lichens were collected in five different years between 2001 and 2009. The data are first compared year to year in order to document any temporal change and trend in metal atmospheric fallo...

The Neoproterozoic-Cambrian transition was a key time interval in the history of the Earth, especially for variations in oceanic and atmospheric chemical composition. However, two conflicting views exist concerning the nature of ocean chemistry across the Precambrian-Cambrian boundary. Abundant geochemical evidence suggests that oceanic basins were...

The kinetics of HgII and methyl red (MR) reduction by hydroxycarbonate green rust (GR1) and by hydroxysulfate green rust (GR2) were studied in the presence of naturally occurring organic and inorganic ligands (phosphate, polyacrylic acid, bacterial cells, silicate). The reducing ability of biogenic hydroxycarbonate green rust (GR1bio), obtained aft...

Systematic variations in the Cd and Pb isotope ratios in polluted topsoils surrounding the Jinding Pb–Zn mine in China were measured so that the sources of the metals could be traced. The average δ114/110Cd value and 206Pb/207Pb isotope ratio in background soils from the region were +0.41‰ and 1.1902, respectively, whereas the contaminated soil sam...

Supplementary data of Remy et al. 2015, Water Res.

Le standard d’eau de rivière naturelle SLRS-5 (NRC-CNRC) est une référence de contrôle qualité en analyse d’eau de routine pour la communauté internationale. Dix laboratoires français étudiant les éléments majeurs et en trace dans les solutions naturelles (groupe de travail de l’atelier du CNRS “Isotrace”) valident leurs mesures avec les 19 élément...

Until now, there has been little data on the isotope fractionation of nickel (Ni) in higher plants and how this can be affected by plant Ni and zinc (Zn) homeostasis. A hydroponic cultivation was conducted to investigate the isotope fractionation of Ni and Zn during plant uptake and translocation processes. The non-accumulator Thlaspi arvense, the...

Which mantle below the active rift segments in Afar? Pik, Stab, Ancellin, Medynski, Cloquet, Vye-Brown, Ayalew, Chazot, Bellahsen, Leroy The evolution of mantle sources beneath the Ethiopian volcanic province has long been discussed and debated with a long-lived controversy in identifying mantle reservoirs and locating them in the mantle. One int...

The natural river water certified reference material SLRS-5 (NRC-CNRC) was routinely analysed in this study for major and trace elements by ten French laboratories. Most of the measurements were made using ICP-MS. Because no certified values are assigned by NRC-CNRC for silicon and 35 trace element concentrations (rare earth elements, Ag, B, Bi, Cs...

The mercury contents of 116 reference materials (RMs) from ten international organizations has been determined. This study was focused on variability within and between batches of RMs. Direct mercury analysis (DMA) has been applied to RMs having Hg contents between 1 and 6300 ng g−1 providing good accuracy and precision. Accuracy was demonstrated b...

En période d'exploitation minière, le cycle de surface des métaux est perturbé par le changement d'occupation des sols et l'érosion qui y est associée, la disponibilité de nouvelles sources de métaux, les rejets secondaires aux activités anthropiques et l'évolution des conditions trophiques des systèmes aquatiques. Une étude préliminaire a montré u...

Stable Zn isotope signatures offer a potential tool for tracing Zn uptake and transfer mechanisms within plant-soil systems. Zinc isotopic compositions were determined in the Zn hyperaccumulator Noccaea caerulescens collected at a Zn-contaminated site (Viviez), a serpentine site (Vosges), and a noncontaminated site (Sainte Eulalie) in France. Meanw...

Multi-collector ICP-mass spectrometry (MC-ICP-MS) was used for the isotopic analysis of Cu, Fe and Zn, isolated from human whole blood. For chromatographic isolation of these elements, the method first described by Maréchal, Telouk and Albarède (Chem. Geol., 1999, 156, 251–273) and relying on the use of AG MP-1 strong anion exchange resin was furth...

Cu, Fe and Zn are transition metals with great catalytic, structural and regulating importance in the human body. Hence, an aberrant metabolism of these elements can have serious implications on the health of a person. It is assumed that, due to differences in isotope fractionation, the isotopic composition of these elements in whole blood of patie...

Molybdenum (Mo) isotopic data from early Cambrian formations in southern China demonstrate the importance of non-euxinic sediments as a promising archive for coeval seawater Mo records. For the first time, in analogue to noneuxinic, nonskeletal carbonates, we report that the pristine phosphorites also can preserve the ambient fluid, which make the...

Adaptive Zn and Cd tolerance have evolved in populations of the ectomycorrhizal fungus Suillus luteus. When exposed to high concentrations of both metals in vitro, a one-sided antagonism was apparent in the Zn- and Cd-tolerant isolates. Addition of high Zn concentrations restored growth of Cd-stressed isolates, but not vice versa. The antagonistic...

We report the isotopic composition of five molybdenum (Mo) standard reference solutions and four fractions from one of these solutions eluted through anion resin column relative to a sixth reference solution. The reference solutions were National Institute of Standards and Technology (NIST) SRM 3134 (lot#891307), Johnson Matthey Specpure (JMC)-Mo S...

Base metal–Ag mineralisation at Dikulushi and in other deposits on the Kundelungu Plateau (Democratic Republic of Congo) developed during two episodes. Subeconomic Cu–Pb–Zn–Fe polysulphide ores were generated during the Lufilian Orogeny (c. 520Ma ago) in a set of E–W- and NE–SW-oriented faults. Their lead has a relatively unradiogenic and internall...

The aim of this research was (i) to compare the use of stable (111Cd) and radioactive (109Cd) isotopes for assessing the isotopically exchangeable pool of Cd (ECd), (ii) to evaluate a simpler alternative method, the extraction by 1 M CaCl2, (iii) to determine ECd in a wide range of soil and contamination types and (iv) to assess how ECd can be affe...

In the northeastern part of France, around the city of Metz, lichens (Hypogymnia physodes) have been transplanted from a single reference site to five different sites: (i) the reference site itself, (ii and iii) two peri-urban sites, (iv) a site in the proximity of a highway, and (v) a final one close to an industrial site. The dynamics of two diff...

Magnesium and strontium isotope signatures were determined during different seasons for the main rivers of the Moselle basin, northeastern France. This small basin is remarkable for its well-constrained and varied lithology on a small distance scale, and this is reflected in river water Sr isotope compositions. Upstream, where the Moselle River dra...

Reimann et al. (2008) recently published a study on Pb-isotope signature along a 120 km long transect cutting the city of Oslo. Based on concentration but also isotope data, they misinterpret Pb concentration of the biosphere in rural places and explain these large enrichments of Pb as being due to natural processes. The study ignores numerous prev...

The potential of laser ablation-single collector-inductively coupled plasma-mass spectrometry for discrimination among Spanish antique lead-glazed ceramics according to age and workshop has been investigated. In order to obtain the required precision, pressurizing the dynamic reaction cell (DRC) with Ne proved to be a significant help. In this way,...

Archaeological samples originating from a cemetery of a Roman settlement, Pretorium Agrippinae (1st-3rd century A.D.), excavated near Valkenburg (The Netherlands) have been subjected to Pb isotopic analysis. The set of samples analysed consisted of infant bone tissue and possible sources of bone lead, such as the surrounding soil, garum, and lead o...

Zinc (Zn) is a trace element that is, as a building block in various enzymes, of vital importance for all living organisms. Zn concentrations are widely determined in dietary, biological and environmental studies. Recent papers report on the first efforts to use stable Zn isotopes in environmental studies, and initial results point to significant Z...

A new methodology has been developed for Pb isotopic analysis of different kinds of archaeological artefacts. The method has been optimized for bone tissue, soil, amphorae and lead objects dating from the Roman Era, and consists of 3 key steps: (i) sample digestion with quantitative Pb recovery, optimized using the certified reference materials NIS...

This chapter describes the geology of the 3.8 Ga Nuvvuagittuq Greenstone belt, Northeastern Superior province, Canada. The Nuvvuagittuq belt is a volcano-sedimentary succession that occurs as a tight to isoclinal synform refolded into a more open south-plunging synform, with bedding largely parallel to the main, steeply dipping schistosity. The sup...

In this study, the Cd isotopic composition of various geological reference materials and anthropogenic samples was investigated. The measurements were made by multicollector ICP-MS and instrumental mass fractionation was controlled using a "sample-standard bracketing" technique. Cadmium isotopic data are reported relative to an internal Cd solution...

1] To quantify and localize nitrogen (N) and carbon (C) in Archean rocks from the Marble Bar formation, Western Australia, and to gain insights on their origin and potential biogenicity, we conducted nuclear reaction analyses (NRA) and carbon and nitrogen isotope ratio measurements on various samples from the 3460-Myr-old Fe-rich Marble Bar chert....

The Nuvvuagittuq greenstone belt is a 3.8 Ga supracrustal succession preserved as a raft in remobilised tonalities along the eastern coast of Hudson Bay. The dominant lithology of the belt is a quartz-ribboned grey amphibolite composed of variable proportions of cummingtonite, biotite and plagioclase. Although the amphibolites have mafic compositio...

Epiphytic lichens, ambient PM-10, and bus air-filter aerosols collected in a city and the surrounding area were used to monitor urban atmospheric metal deposition in the Metz area, NE France. According to the measured Pb and Zn concentrations, high-enrichment factors (EF) were calculated for lichens collected in 2001 and 2003, suggesting an anthrop...

Tracing the source of heavy metals in the environment is of key importance for our understanding of their pollution and natural cycles in the surface Earth reservoirs. Up to now, most exclusively Pb isotopes were used to effectively trace metal pollution sources in the environment. Here we report systematic variations of Cd isotope ratios measured...

Epiphytic lichen samples were collected in and around a city of 300 000 inhabitants in NE France to study the dispersion and fallout of Cd, Cu, Zn and Pb. Lichens hanging in small tree branches within a 15 km radius from the city centre, together with bus air filter aerosols and unleaded gasoline samples, were analysed to evaluate the relative cont...

The origin of Archeaen banded iron formations (BIF) and the role of biosphere in Fe precipitation is still highly debated. In order to elucidate these processes, detailed mineralogical and textural analyses combined with delta 15 N, delta 56 Fe and delta 13 C data were obtained on Fe-oxide bands from Marble Bar chert Unit (MB, 3.46 Ga, Pilbara crat...