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January 2004 - present
September 2000 - present
January 1998 - present
Publications
Publications (43)
Our study deals with the part played by bedrock grain size on soil formation rates. U- and Th-series disequilibria were measured in two soil profiles developed from two different facies of the same bedrock, i.e., fine and coarse grain size granites, in the geomorphically flat landscape of the experimental Breuil-Chenue forest site, Morvan, France.T...
The recent chemical dynamics of a podzolic forest soil section (from the Strengbach watershed, France) was investigated using U- and Th-series nuclides. Analyses of (238U), (230Th), (226Ra), (232Th), (228Ra) and (228Th) activities in the soil particles, the seepage waters, and the mature leaves of the beech trees growing on this soil were performed...
The exploration and exploitation of deep geothermal resources require to understand and conceptualize their functioning in all its complexity (scales and processes), to define the associated uncertainties and to evaluate their consequences in order to make decisions.
A solution is proposed to meet this objective based on the results, the multidisci...
In recent decades, U- and Th- series nuclides have been successfully used to determine weathering rates in soils and regoliths. However, the redistribution of the nuclides within secondary minerals and/or organic matter may interfere with the recorded U- and Th-series weathering signals and can result in inaccurate and/or poorly constrained weather...
The chemical weathering rate of silicates is a key parameter of several geochemical processes; however, the long-term field measurement of these rates remains challenging. Currently, there are several methods for quantifying field weathering rates, but each presents it's own unique set of difficulties. In this study uranium-series nuclides were use...
The determination of the mechanisms and extent of soil mineral weathering can be challenging, and the caveats reside in 1) difficulty identifying minerals that are actually involved in weathering reactions, 2) non-stoichiometric release of cations during weathering processes due to coupled dissolution, precipitation and transformation reactions and...
This study presents U-Th-Ra isotope data for soils, soil grain size fractions, soil solutions, throughfall, rainwater and tree samples from two experimental plots under spruce and beech trees, in the Strengbach catchment (France) that highlight the importance of the ²³⁸U-²³⁴U-²³⁰Th-²²⁶Ra nuclides and the (²³⁰Th/²³²Th) for the tracing of biogeochemi...
As part of the GEOTREF research project, a cost-effective approach, relying on innovative software tools, is proposed to carry out prefeasibility studies prior drilling based on numerical conceptual models associated with phenomenological modelling and well layout optimization. The numerical conceptual models are intended to be 3D structural, geolo...
Clay minerals hold some key information on time and rate of weathering processes that could be deciphered by U-series disequilibria. However a removal of organic matter is generally required prior to clay mineral chemical analyses, especially in soils. The impact of two protocols of organic matter removal on the U-series disequilibria in three diff...
Over the last decades, the U- and Th-series nuclides were successfully used to determine weathering rates in various environments. The objective of this study is to assess the potential impact of the vegetation change on the U- and Th-series signal recorded in forested soils. This study was carried out from the experimental forest site of Breuil-Ch...
In order to constrain the transfer time of sediments in Alpine rivers,
we propose to use the U-series nuclides approach recently developed for
Himalayan rivers (e.g., Chabaux et al., 2008; Granet et al., 2010).
Therefore, a series of bank sediments has beeen collected along the Dora
Baltea river (Italia), one of the Po's tributaries draining the so...
The effect of land cover change on chemical mobility and soil response
was investigated using short- and long-lived nuclides from the U- and Th
series. Indeed, the matching of these nuclides half-live to the
pedogenic processes rates make these nuclides especially suitable to
investigate either time or mechanism of transfers within a
soil-water-pla...
Because soils form at the critical interface between the lithosphere and
the atmosphere, characterization of the dynamics occurring through this
compartment represents an important goal for several scientific fields
and/or human activities. However, this issue remains a challenge because
soils are complex systems, where a continuous evolution of mi...
Frozen permafrost ecosystems are particularly sensitive to climate
warming, which notably induces a deepening of the active layer (the
maximum thawing depth during summer time). As a consequence, geochemical
and hydrological fluxes within boreal areas are expected to be
significantly affected in the future. Understanding the relationship
between en...
In order to constrain the origin and fluxes of elements carried by rivers of high latitude permafrost-dominated areas, major and trace element concentrations as well as Sr and U isotopic ratios were analyzed in the dissolved load of two Siberian rivers (Kochechum and Nizhnyaya Tunguska) regularly sampled over two hydrological cycles (2005–2007). La...
Because soils form at the critical interface between the lithosphere and
the atmosphere, characterization of the dynamics occurring through this
compartment represents an important goal for several scientific fields
and/or human activities. However, this issue remains a challenge because
soils are complex systems, where a continuous evolution of mi...
Our method for the simultaneous determination of the four natural Ra isotopes ((226)Ra, (228)Ra, (224)Ra and (223)Ra) in thermal waters involves a separation of Ra on a selective filter (3M EMPORE Radium Rad disk), and a single counting using a broad-energy HPGe detector (BE Ge manufactured by CANBERRA). The calculation of (223)Ra and (228)Ra activ...
a b s t r a c t This paper describes new fossil materials recovered at the Duoi U'Oi site, in December 2003, by a Vietnamese-French-Japanese team. The Duoi U'Oi cave is located in Man Duc village, 25 km of Hoà Binh city in northern Vietnam. It belongs to a karstic network developed in a dark grey micritic marine limestone dated from the Lower to th...
Whereas the method based on the decrease of excess 210Pb has already been used to date young (< 120 yr) speleothems (e.g. [M. Baskaran, T. M. Iliffe, Age determination of recent cave deposits using excess 210Pb — A new technique, Geophys. Res. Lett. 20 (1993) 603–606.]), this paper presents the first dating of a speleothem through the 226Ra–210Pb m...
The aim of the present study was to propose a simplified experimental-theoretical method for estimating the kinetic and thermodynamic parameters for the solid-liquid separation of pollutants by using kinetic studies with batch reactors, i.e., the removed quantity of dissolved ion as a function of time at different initial concentration. This method...
The natural speciation of Mn (0.19 g/kg), Ni (46 mg/kg), and Zn (42 mg/kg) in the argillic horizon (120 cm depth, pH = 5.6) of an Ultisol from a paddy soil in northern Taiwan was investigated by advanced X-ray synchrotron techniques. Microchemical associations were imaged by synchrotron-based X-ray microfluorescence, host minerals were identified b...
Major elements, trace elements and Sr and U isotopes were analyzed in the dissolved load of water samples collected in the main reservoirs of the Rhine graben, i.e. the Rhine River, its main tributaries and the shallow and deep ground waters in several different aquifers. Our results confirm that the variations of major elements, trace elements (es...
In the Tyrrhenian region of central Italy, late Quaternary fossil travertines are widespread along two major regional structures: the Tiber Valley and the Ancona–Anzio line. The origin and transport of spring waters from which travertines precipitate are elucidated by chemical and isotopic studies of the travertines and associated thermal springs a...
An improved method was developed to measure 226Ra, 228Ra and 224Ra in freshwaters by gamma spectrometry. Radium was selectively extracted from acidified samples using specific filters (3M EMPORE™ Radium Rad disks). The latter was subsequently analysed by gamma spectrometry. Simultaneous and direct determination of the activities of the three isotop...
We demonstrate that the X-ray standing wave (XSW) technique is a powerful probe of the electrical double-layer (EDL) structure. Measurements were made of Sr adsorption at the rutile (110)-water interface from aqueous solutions. Our results show that Bragg XSW, using small-period standing waves generated by Bragg diffraction from the substrate, prec...
U-series dating of hydrothermal carbonates, deposited by CO2-rich thermo-mineral waters of the French Massif Central, provides new insights on the long-term behaviour of a continental hydrothermal system. Dating of aragonite veins and travertines impregnating old terrace levels of the Allier river allowed identification of the main episodes of surf...
U-series dating of hydrothermal carbonates, deposited by CO2-rich thermo-mineral waters of the French Massif Central, provides new insights on the long-term behaviour of a continental hydrothermal system. Dating of aragonite veins and travertines impregnating old terrace levels of the Allier river allowed identification of the main episodes of surf...
X-Ray standing wave (XSW) measurements were made of Rb and Sr adsorbed from aqueous solutions at the rutile (110)-water interface. These experiments were performed to address the extent to which direct measurements of electrical double-layer structure are possible. The experimental results show that the Bragg XSW technique, using small-period stand...
We studied U, Ra and Ba incorporation in calcite in a natural CO2-rich hydrothermal area from the French Massif Central. Along the western border of the Limagne graben, several springs are exploited for the petrifaction of various artifacts with calcite. These sites offer the opportunity to sample the water and the calcite layers downflow from the...
Calcium carbonate (travertine) deposits precipitated from CO2-rich thermo-mineral waters of the Auvergne region (French Massif Central) have high 226Ra (up to 2 Bq·g−1) and 228Ra activities. 210Pb and 228Th, produced by decay of 226Ra and 228Ra respectively, are absent in the carbonate at the time of precipitation. It is thus possible to use these...
. The U/Th method has been applied to eight speleothem samples from the Demoiselles Cave (Hérault, France), as a first attempt to decipher the history of this cave and compare it to that of another cave in the same region of southern France (Clamouse Cave). Mass spectrometry (U and Th contents) and a spectrometry [(234U/238U) ratios and (230Th) act...
U-series dating of hydrothermal carbonates, deposited by CO 2-rich thermo-mineral waters of the French Massif Central, provides new insights on the long-term behaviour of a continental hydrothermal system. Dating of aragonite veins and travertines impregnating old terrace levels of the Allier river allowed identification of the main episodes of sur...
Uranium- and Th-series radionuclides have been analyzed in CO2-rich geothermal waters and their associated iron hydroxide and carbonate deposits from the French Massif Central. A geochemical budget for U and Ra in water and solid deposits has been estimated. Most of the U (>75%) remains in solution, probably because of the presence of soluble U-car...
