Centres d'excellences

PLATEFORME DE GEOCHIMIE ISOTOPIQUE ASTER/CEREGE

ASTER-CEREGE

Equipements d'excellence (EQPX)

Informations générales

Référence projet : 10-EQPX-0024
RST : Edouard BARD
Etablissement Coordinateur : Université d'Aix-Marseille
Région du projet : Provence-Alpes-Côte d'Azur
Discipline : 3 - STUE

Aide de l'ANR 3 697 120 euros
Investissement couvrant la période de février 2011 à décembre 2019

Résumé de soumission

The ASTER-CEREGE project originates from the CEREGE supervised by five founders: Aix-Marseille University, CNRS, IRD, Collège de France  and INRA.

The compact accelerator mass spectrometer (Element 1) has been installed in 2014 in its new building on the Arbois Campus. AixMICADAS has an hybrid ion source working with graphite targets and CO2 gas, coupled to an interface system that ensures stable gas measurements from different sources. The laboratory is also equipped with an automated graphitization system.

The Element 2 includes a mass spectrometer equipped with an inductively-coupled-plasma source, a magnetic mass filter, and multiple collection (MC-ICPMS, Neptune+ type). After an initial phase of tests, it is now operational since the beginning of 2015. The ultra-clean laboratory for the preparation of samples is also fully operational since 2014.

The new high-intensity ion source for the ASTERisque accelerator (Element 3) was delivered in early 2015, tested and finally accepted on September 10, 2015.

In parallel to methodological developments, the three spectrometers already allowed us to contribute to several scientific programs in fundamental and applied geochemistry (Tranche 2):

_  Precise and accurate 14C dating of subfossil wood to expand the tree-ring 14C calibration,

_  Air pollution studies by using 14C as a source tracer for carbonaceous aerosols,

_ Joint studies combining cosmogenic nuclides and carbon isotopes as tracers in soils to study the global pressures and their role in climate change,

_ U/Pb geochronology on carbonates applied to secondary cements, which control properties of petroleum reservoirs,

_ Studies based on 10Be analyzes of the relief evolution of Brazil,

_ Using 36Cl as a tracer of the groundwater of the deep aquifer of the Lake Chad basin in order to constrain recharge times of freshwater resource,

_ Studies based on 10Be and 36Cl analyzes in sediments or ice cores of the temporal variations in the geomagnetic field intensity.

L'auteur de ce résumé est le coordinateur du projet, qui est responsable du contenu de ce résumé. L'ANR décline par conséquent toute responsabilité quant à son contenu.

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