Biography:

In the past Jean-Charles Fontes has collaborated on articles with Corinne Le Gal La Salle. One of their most recent publications is Accelerator mass spectrometry in hydrology. Which was published in journal Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.

More information about Jean-Charles Fontes research including statistics on their citations can be found on their Copernicus Academic profile page.

Jean-Charles Fontes's Articles: (2)

Accelerator mass spectrometry in hydrology

AbstractApplications of 14C, 36C1 and 129I in hydrology using the AMS technique are reviewed. The small amounts of carbon needed for AMS measurement of 14C have facilitated new areas of hydrological research. Uncertainties in the natural fall-out of 36Cl and the dissolution of 36Cl-labelled chloride during groundwater migration are limitations for groundwater dating with this nuclide. Estimation of recharge by measurements of the advance of the 6Cl bomb peak through the unsaturated zone is of increasing importance in hydrology. AMS measurements of 129 I will provide an environmental monitor for nuclear pollution plumes. Some directions for future studies are suggested.

Geochemistry and14C dating of groundwaters from Jurassic aquifers of North Aquitaine Basin (France)

AbstractTwenty-seven samples from a confined Lower-Middle Jurassic aquifer and an unconfined Oxfordian aquifer of the North Aquitaine Basin (France) have been analysed for their major elements, Br−,18O,2H,13C and14C contents. Hydrochemistry indicates (1) a dissolution of carbonate and anhydrite near the recharge zone and (2) a dilution of a saline water derived from a seawater/halite mixing in the deeper part of the aquifer. The mixing is also visible in a δ18O vs Cl− diagram in which two different groups appear: recent waters and old waters indicating a mixing process between fresh and saline groundwaters. The composition of the saline water is likely to be 34,100±11,200 ppm in Cl, 70±20 ppm in Br and more than −3.5±07‰ vs SMOW in18O.13C contents indicate (1) a C exchange with CaCO3 matrix for groundwaters near the recharge zone and (2) a participation of organic matter in the deep part of the aquifer.Residence times for waters near the area of the aquifer outcrop correspond to Holocene and Late Pleistocene periods. The depletion in stable isotopes of 10 to 15,000 y B.P. waters show a late glacial period infiltration to the aquifer. After a distance of about 10 km in the aquifer, the14C activities are 0 pmc showing the presence of ‘old’ groundwaters.

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