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Publications (55)
Multi‐element quantification in small amounts of material and in situ measurements at the micrometre scale are essential aspects of geological sample investigation. A direct and rapid simultaneous multi‐elemental determination of metals in crude oil samples was carried out by combining direct laser ablation of the oil inserted in silica capillaries...
Titanites can be excellent markers of element transfer in medium-temperature retrograde metamorphism. Euhedral titanites from several alpine fissures from Mont Blanc, particularly those of Périades and Courtes, crystallised at the end of the main quartz stage and are synchronous with the formation of green biotites and albite before chlorite format...
At Soultz-sous-Forêts, the geothermal reservoir was identified around thirty years ago by drilling down to depths of 5000 m. It comprises the base of the Mesozoic series and the underlying fractured granitic basement. Fluid inclusion data have shown near-continuous mixing trends between two main fluid end-members: i) brines interpreted as of primar...
Le bassin de l'Athabasca au Canada est considéré comme la référence mondiale pour les gisements d'uranium à haute teneur de type discordance avec des exemples comme Cigar Lake ou McArthur River présentant des teneurs en U supérieures à 20% en moyenne. La formation de ces gisements requiert la conjonction spatio-temporelle de processus complexes. Le...
In phosphorites, the content and distribution of rare earth elements are linked to the environment of phosphogenesis. This paper focuses on the question of sources and processes controlling the rare earth element content of apatite from Belgian phosphorites formed during three major phosphogenic events in the Lower Palaeozoic, Late Cretaceous and C...
The in situ (U‐Th‐Sm)/He and U/Pb laser‐ablation double‐dating procedure is a valuable method that can provide a large dataset relatively efficiently in contrast with conventional bulk helium thermochronometry. In this study, we evaluate the potential age error associated with the double ablation procedure and report the in situ (U‐Th‐Sm)/He double...
The relative contribution of magmatic and non-magmatic fluids to the metasomatic and ore-forming processes in iron-oxide copper‑gold (IOCG) deposits is still widely debated. In this study, the petrography, detailed composition and U-Pb ages of various apatite occurrences from the Nautanen North IOCG deposit, Norrbotten, Sweden, were determined to d...
Understanding mass transfer associated with fluids circultion and deformation in the Alpine orogeny is often complex due to common multistage crystallization. For example, in two emblematic and historic Pb-Ag deposits of the French Alps, Macôt-la Plagne (MP) and Peisey-Nancroix (PN), a sedimentary or orogenic origin is still debated. To discriminat...
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...
Comprehensive mineralogical and petrographic studies require analytical methods capable to report the distribution of major to trace elements within crystals in order to unravel their formation conditions and subsequent evolution. Additionally, the investigation of transition elements (e.g., Ti, V, Cr, Mn, Fe, and Zn) is essential for the comprehen...
Wolframite has been proposed as a U/Pb geochronometer for direct dating of W mineralisation events, but its isotopic analysis may be hampered by highly variable and low U contents (<200 ppm) and low ²⁰⁶Pb/²⁰⁴Pb ratios (〈300), heterogenous common Pb compositions, post-crystallisation alteration, and the presence of non-cogenetic mineral and fluid in...
The quantification of the REEs in natural rocks and fluids is important not only for the sustainable use of geological resources but also for fundamental geological research. Due to significant improvements in experimental, modelling and analytical techniques, it was discovered that the REEs could be efficiently mobilised and transported by hydroth...
The Jbel Haïmer copper-sulphide mineralisation occurs at 20 km north of Marrakesh in the Variscan Jebilet
massif, Morocco. Most of the ores (up to 3.9 wt% Cu, ≤38 ppm Ag, and up to 2.9 ppm Au) occur as impregnations
of NE-SW fault/fracture zones and related tectonic breccia. Two independent stages of fluid circulation and
mineral deposition are dis...
The mill tailings from uranium mines constitute very low-level, long-lived, radioactive process waste. Their long-term management therefore requires a good understanding of the geochemical mechanisms regulating the mobility of residual uranium and radium-226. This article presents the results of the detailed characterization of the tailings resulti...
Stable oxygen and carbon isotope analyses are commonly used to attempt to establish the provenance of ancient marble artifacts such as statues and architectural elements. In this study we apply the technique for a novel purpose: establishing the provenance of an important and mysterious inscribed document from the Roman Empire known as the Nazareth...
The Haftcheshmeh Cu-Mo porphyry deposit is located in the NW part of the Arasbaran Metallogenic-Magmatic Zone, NW Iran. Ore mineralisation is generally hosted within the gabbro-diorite and granodiorite porphyry stocks, presenting various types of hydrothermal quartz veins and veinlets associated with potassic to sericitic alteration.
Stage I corres...
The Trikorfo area (Thassos Island, Rhodope massif, Northern Greece) represents a unique mineralogical locality with Mn-rich minerals including kyanite, andalusite, garnet and epidote. Their vivid colors and large crystal size make them good indicators of gem-quality materials, although crystals found up to now are too fractured to be considered as...
Three spinel lherzolite xenoliths from Mt. Quincan (Queensland, northeastern Australia) were studied with special attention to their enclosed fluid inclusions. The xenoliths are deformed, have porphyroclastic textures and overall show very similar petrographic features. The only significant difference is manifested in the abundance of fluid inclusi...
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...
The Alum Shale Formation is a metal-rich black shale, deposited on the Baltoscandian platform between Middle Cambrian and Early Ordovician. These black shales may be of particular economic interest for their relatively high uranium content (100-300 ppm) and their wide distribution from Norway to Estonia. Scandinavian Alum Shale may thus constitute...
The zinc mines of Tennessee are known to contain high concentrations of certain trace elements (Cu, Ga, Ge, Fe, and Cd). Here, we investigate and compare sphalerites from two mining districts in the center (Central Tennessee Mines: CT) and east of Tennessee (East Tennessee Mines: ET) in order to (1) understand the substitution mechanisms that contr...
Spectacular alteration of monazite by diagenetic/hydrothermal brines is well documented in some Proterozoic sedimentary basins in close relationship with high-grade uranium (U) deposits. Hence, monazite has been proposed as a viable source for some U deposits. However, monazite alteration remains enigmatic with regard to its high stability in relat...
Spectacular alteration of monazite by diagenetic/hydrothermal brines is well documented in some Proterozoic sedimentary basins in close relationship with high-grade uranium (U) deposits. Hence, monazite has been proposed as a viable source for some U deposits. However, monazite alteration remains enigmatic with regard to its high stability in relat...
Leaching tests of natural materials (granites) were carried out according to the experimental procedure recommended by the AFNOR NF X31-210 French standard relative to the characterization of ultimate industrial stabilised waste. The rocks were selected for: (i) their representativity of the main granite types outcroping at the earth's surface, (ii...
In the central part of the Fennoscandian Shield, the Talvivaara Ni-Zn-Cu-Co deposit, hosted by Palaeoproterozoic metamorphosed black schists, contains low uranium concentrations ranging from 10 to 30 ppm. The Talvivaara black schists were deposited 2.0-1.9 Ga ago and underwent subsequent metamorphism during the 1.9-1.79 Ga Svecofennian orogeny. Anh...
In France, uranium mines were exploited between 1945 and 2001, leading to the production of 76,000 t of U and 50 Mt of mill tailings stored on 16 storage sites. Studies are being performed to determine the long term behaviour of these storage sites, focusing on the mobility of U and 226 Ra. Following previous work [1] on mill taillings issued from...
B-Nb2O5 was recrystallized from commercially available oxide, and XRD analyses indicated that it is stable in contact with solutions over the pH range 0 to 9, whereas solid polyniobates such as Na8Nb6O19⋅13H2O(s) appear to predominate at pH>9. Solubilities of the crystalline B-Nb2O5 were determined in five NaClO4 solutions (0.1≤I
m
/mol⋅kg−1≤1.0) o...
Uranium has been mined in the Limousin area (France) until the end of the 90’s. Nowadays mines are closed and environmental
monitoring is conducted by the former operator (AREVA-NC) under the control of the French administration. In the year 2006,
the French safety authority board has created a pluralist expert group (GEP) that enjoin experts, stak...
Chemical weathering and supergene dissolution processes of Pt-bearing chromite have been studied in a lateritic weatheringprofile developed on ultramafic rocks in New Caledonia (southwest Pacific). The chemical distributions of alkaline earth, transition metals, and precious metals (including Pt and Pd) were determined in a weathering profile varyi...
This work aims to study the influence of oxidation degree state which reached by organic matter included in argillaceous rocks on lixiviation and mobilization of compounds. Experimental lixiviation was carried out on two argillaceous rocks sampled in the surface deposit of the Andra laboratory (Bure, France). Molecular and spectroscopic characteriz...
Eluvial concentration of platinum-group minerals (PGM) has developed in the south of New Caledonia, from the weathering of a mafic and ultramafic cumulate. The platinum/palladium (Pt/Pd) ratio evolution from the bottom to the top of the weathering profile indicates a chemical mobilization of Pd in supergene environment. The examination by scanning...
The alteration and transformation behaviour of montmorillonite (Wyoming bentonite) was studied experimentally to simulate the mineralogical and chemical reaction of clays in contact with steel in a nuclear waste repository.Batch experiments were conducted at 80 and 300°C, in low-salinity solutions (NaCl, CaCl2) and in the presence or otherwise of m...
The alteration and transformation behaviour of montmorillonite (bentonite from W yoming, MX-80) in low-salinity solutions (NaCl, CaCl2) in the presence of metallic Fe (powder and 8× 4× 1 mm plate) and magnetite powder was studied in batch experiments at 300ºC to simulate the mineralogical and chemical reactions of clays in contact with steel in a n...
This paper presents the results of a study on stream and mine waters in the area of the largest porphyry copper deposit in the Apuseni Mountains (western Romania), the Rosia Poieni ore deposit. The research was focused on two aspects of environmental impact: (1) evaluation of the release of toxic elements into the environment through studying the m...
Raman spectra have been used to identify and characterize aqueous hydroxouranyl(VI) complexes from 0.0038 to 0.647M at pH from 0.24 to 14.96 adjusted witheither HCF3SO3 and/or (CH3)4NOH under ambient conditions. In acidic media(0.24 ≤ pH ≤ 5.63), the existence of four species UO2+2,(UO2)2(OH)3+,(UO2)2(OH)2+2, and (UO2)3(OH)+5 was confirmed. At high...
The quantitative study of the adsorption of metallic ions on both organic and mineral surfaces showed that sorption is strongly dependent on chemical parameters such as pH or competing ions. An increase in pH yields to a greater amount of fixed metals whereas the competition between ions tends to decrease the relative amount of each sorbed element....
The solubility of uranium oxide was investigated in both aqueous halide (Cl, F) fluid and granitic melt in equilibrium in the system uranium oxide-haplogranite-H2O-NaCl (0.1 5.0 molal), NaF (0.1 0.5 molal) at 770°C, 2 kbar, and fO2 conditions controlled by Ni-NiO, Fe3O4-Fe2O3, and Cu2O- CuO buffers. Three distinct uranium oxides UO(2+x) with x = 0....
The solubility of uranium was investigated in both carbonated aqueous fluid and granitic melt in equilibrium in the system haplogranite-uranium oxide-H2O-Na2CO3 (0.5–1 molal) at 720–770°C, 2 kbar, andƒo2 fixed by Ni-NiO, Fe3O4-Fe2O3, and Cu2O-CuO buffers. As complete solid solution exists between UO2.00 and UO2.25 (i.e., 75 mol% UO2 + 25 mol% UO3),...
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