The Geohelis platform is a university-certified platform for improving the readability of the institution’s technical resources

This platform brings together a centre of analytical resources devoted to the analysis of major chemical and trace elements (inorganic anions/cations, dissolved carbon) of environmental samples (mainly water but also certain minerals, biological samples, etc.) and a second devoted to the elementary and/or isotopic analysis (radiogenic isotopes) of rocks and/or minerals to study the origin, the history and age of terrestrial rocks and of the associated minerals

Scientific manager of the platform : Marc Poujol with the support of Rémi Marsac
Technical managers of the platform : Martine Bouhnik Le Coz and Nathan Cogné with the technical support of Dominique Bavay, Maxime Pattier, Patrice Petitjean et David Vilbert,


Excimer laser coupled to a Q-ICP-MS for in-situ trace-elements analysis and in-situ U-Th/Pb dating QQQ ICP-MS for solution elemental analyses.

Skills / Expertise:

  • U-Th-Pb, K-Ar, (U-Th)/He and Fission Tracks Dating
  • Trace elements analysis by LA-ICP-MS
  • ICP-MS analysis of major and trace elements analyses of dissolved environmental samples.
  • Analysis of dissolved organic carbon concentrations by carbon analyzer (TOC).
  • Analysis of dissolved anion concentrations by ion chromatography.
  • UV spectrophotometry

Introducing GeOHeLiS

GeOHeLiS platform

Accessibility rules

This structure is open to all researchers from the Rennes 1 University research units, to research institutions collaborating with these units and, subject to availability, to private partners. All requests must be validated by the instrument engineers. They will assess the feasibility of the analyses and define a schedule based on the requests.
All the Publication/Communication/Thesis that will use data acquired within the platform are requested to cite the GeOHeLiS in the acknowledgment section. 

Application sectors and equipment

Chemical (elemental and/or isotopic) analyses of environmental samples (surface water, groundwater, plants, micro-organisms, biogenic samples, etc.) or geological samples (rocks and minerals)
Equipment of the structure
  • Equipment 1: Excimer laser coupled to Q-ICP-MS for elemental or isotopic analysis by in-situ laser ablation and U-Th-Pb dating
  • Equipment 2: Rare Gas Mass Spectrometers (Ar, He) for K-Ar and (U-Th)/He and Solid Source Mass Spectrometer (TIMS) for isotopic analyses (Sm, Nd, Sr, Pb).
  • Equipment 3: Q-ICP-MS for measuring concentrations of major elements and traces of dissolved environmental samples
  • Equipement 4: QQQ-ICP-MS for measuring concentrations of major and trace elements of dissolved environmental samples
  • Equipment 5: Two UV-Vis spectrophotometers
  • Equipment 6: Two carbon analyzers (TOC) including one with nitrogen analysis.
  • Equipment 7: Ion chromatography for analysis of dissolved anions.
  • Equipment 8: Anton-paar Multiwave 7000 Micro-Wave


2021 :

E. Marcoux, B. Barré, M. Pichavant, M. Poujol (2021). Age and genesis of the rare metals (Sn, Li, Nb-Ta, W) granite cupola of Montebras (Creuse, French Massif Central).  BSGF-Earth Sciences Bulletin, 192, 16. DOI: 10.1051/bsgf/2020042

Franco, J.A., Cramer, T., Chaves, A. de Oliveira, Horn, H.A., Poujol, M (2021). Geochronology of monazite related to REE, Nb-Ta and U-Th bearing minerals from Mesoproterozoic anorogenic magmatism in the E-Colombian, Amazonian Craton: links to mantle plume activity in the Columbia (Nuna) supercontinent. Journal of South American Earth Sciences, 109, 103228. DOI: 10.1016/j.jsames.2021.103228

F. Cheval-Garabédian, M. Faure, E. Marcoux, M. Poujol (2021). The tungsten-gold veins of Bonnac (French Massif central): new constraints for a Variscan granite-related genesis. BSGF-Earth Sciences Bulletin, 192, 7. DOI: 10.1051/bsgf/2020041

Z.S.V.J. Kahou, S. Duchêne, S. Brichau, E. Campos, G. Estrade, M. Poujol, M. Kathirgamar, H. Testa, M. Leisen, S. Choy, P. de Parseval, R. Riquelme, S. Carretier (2021). Mineralogical and chemical characterization of supergene copper-bearing minerals: examples from Chile and Burkina Faso. Ore geology Reviews, 133, 104078. DOI: 10.1016/j.oregeorev.2021.104078

Lu, Y, Wingate, MTD, Champion, DC, Smithies, RH, Johnson, SP, Mole, DR, Poujol, M, Zhao, J, Maas, R and Creaser RA (2021). Samarium–neodymium isotope map of Western Australia: Geological Survey of Western Australia, digital data layer.

G. Launay, S. Sizaret, P. Lach, J. Melleton, E. Gloaguen, M. Poujol (2021). Genetic relationship between greisenization and Sn-W mineralizations in vein and greisen deposits: Insights from the Panasqueira deposit (Portugal). BSGF - Earth Sciences Bulletin, 192, 2. DOI: 10.1051/bsgf/2020046

M. Poujol, J. Jaguin, J.-F. Moyen, P. Boulvais, J.-L. Paquette (2021). Archean S-Type granites: petrology, geochemistry and geochronology of the Lekkersmaak and Willie plutons, Kaapvaal Craton, South Africa.  South African Journal of Geology. DOI: 10.25131/sajg.124.0004

Z. S. Kahou, S. Brichau, M. Poujol, S. Duchêne, E. Campos, F-X d’Abzac, R. Riquelme, S. Carretier. (2021). First U-Pb LA-ICP-MS in situ dating of supergene copper mineralization: Case study in Chuquicamata mining district, Atacama Desert, Chile. Mineralium Deposita, 56, 239–252. DOI: 10.1007/s00126-020-00960-2

J.A. Franco, T. Cramer, A. Bonilla, A. Castañeda, M. Poujol, Z Amaya (2021). Mineralogía y geocronología de rutilo-(Nb,Ta) relacionado a casiterita y columbita-tantalita provenientes de rocas Mesoproterozoicas del Cratón Amazónico cerca de Cachicamo, Colombia. Boletin de Geologia, 43/1, 100-126. DOI: 10.18273/revbol.v43n1-2021005

P.Y.J. Antonio, M. Souza D'Agrella-Filho, A. Nedelec, M. Poujol, C. Sanchez, E.L. Dantas, R. Dall'Agnol, M.F. Barbosa Teixeira, A. Proietti, C.I. Martínez Dopico, D.Oliveira, F. Silva, B (2021). Marangoanha, R. Trindade. New constraints for paleogeographic reconstructions at ca. 1.88 Ga from geochronology and paleomagnetism of Carajás dyke swarms (eastern Amazonia). Precambrian Research, 353, 106039. DOI: 10.1016/j.precamres.2020.106039

2020 :

Andrade V.S., Wiegand C., Pannard A., Gagneten A.M., Pédrot M., Bouhnik-Le Coz M., Piscart C.  (2020) How can interspecific interactions in freshwater benthic macroinvertebrates modify trace element availability from sediment? Chemosphere, 245, 125594. DOI: 10.1016/j.chemosphere.2019.125594

Baudrimont M., Arini A., Guégan C., Venel Z., Gigault J., Pedrono B., Prunier J. Maurice L., Ter Halle A., Feurtet-Mazel (2020) Ecotoxicity of polyethylene nanoplastics from the North Atlantic oceanic gyre on freshwater and marine organisms (microalgae and filter-feeding bivalves). Environmental Science and Pollution Research, 27, 3746–3755. DOI: 10.1007/s11356-019-04668-3

Bochet, O., Bethencourt, L., Dufresne, A., Farasin, J., Pédrot, M., Labasque, T., Chatton, E., Lavenant, N., Petton, C., Abbott, B., Aquilina, L. & Borgne, T. L. (2020) Iron-oxidizer hotspots formed by intermittent oxic–anoxic fluid mixing in fractured rocks. Nature Geoscience, 1–7. DOI: 10.1038/s41561-019-0509-1

Casquin A., Gu S., Dupas R., Petitjean P., Gruau G., Durand P. (2020) River network alteration of CNP dynamics in a mesoscale agricultural catchment. Science of the Total Environment 749, 141551. DOI: 10.1016/j.scitotenv.2020.141551

Catrouillet C., Guénet H., Pierson-Wickmann A.C., Dia A., Bouhnik-Le Coz M., Deville S., Davranche M., Lenne Q. (2020) Rare Earth Elements as tracers of active colloidal organic matter composition. Environmental Chemistry 17, 133-139. DOI : 10.1071/EN19159

Chaussavoine, I., Beauvois, A., Mateo, T., Vasireddi, R., Douri, N., Priam, J.,Y. Liatimi, S. Lefrançois, H. Tabuteau, M. Davranche, D. Vantelon, T. Bizien, L. M. G. Chavas and B. Lassalle-Kaiser (2020). The microfluidic laboratory at Synchrotron SOLEIL. Journal of Synchrotron Radiation, 27(1). DOI: 10.1107/S1600577519015042

Cheng W., Zhou L., Marsac R., Boily J.-F., Hanna K. (2020) Effects of organic matter–goethite interactions on reactive transport of nalidixic acid: column study and modeling. Environmental Research 191, 110187. DOI: 10.1016/j.envres.2020.110187

Davranche M., Gelabert A., Benedetti M. (2020) Electron transfer drives metal cycling in the critical zone. Element. DOI: 10.2138/gselements.16.3.185

Demangeat E., Pédrot M., Dia A., Bouhnik-Le Coz M., Davranche M., Cabello-Hurtado F. (2020) Surface modifications at the oxide/water interface: Implications for Cu binding, solution chemistry and chemical stability of iron oxide nanoparticles. Environmental Pollution, 257, 113626. DOI: 10.1016/j.envpol.2019.113626

Frei R., Abbott B. W., Dupas R., Gu S., Gruau G., Thomas Z., Kolbe T., Aquilina L., Labasque T., Laverman A., Fovet O., Moatar F., Pinay G. (2020) Predicting nutrient incontinence in the Anthropocene at watershed scales. Frontiers in Environmental Science7, 200. DOI: /10.3389/fenvs.2019.00200

Gigault J., Davranche M., Lory C., Le Juge C., Blancho F., Dia A., Grassl B., El Hadri H., Pascal P.-Y. (2020) "Nanoplastics on the coast exposed to the North Atlantic Gyre: Evidence and traceability" NanoImpact, 20, 100262. DOI: 10.1016/j.impact.2020.100262

Humbert G., Parr T.B., Jeanneau L., Dupas R., Petitjean P., Akkal-Corfini N., Viaud V., Pierson-Wickmann A.C., Denis M., Inamdar S., Gruau G., Durand P., Jaffrézic A. (2020). Agricultural practices and hydrologic conditions shape the temporal pattern of soil and stream water dissolved organic matter. Ecosystems 23, 1325-1343. DOI: 10.1007/s10021-019-00471-w

Pradel A., El Hadri H., Desmet C., Ponti J., Reynaud S., Grassl B., Gigault J. (2020) Deposition of environmentally relevant nanoplastic models in sand during transport experiments. Chemosphere, 255, 126912. DOI: 10.1016/j.chemosphere.2020.126912

Ratié, G., Vantelon, D., Pédrot, M., Beauvois, A., Chaouchi, K., Fossé, C. & Davranche, M. (2020) Cerium anomalies in riverbanks: Highlight into the role of ferric deposits. Science of The Total Environment, 713, 136544. DOI: /10.1016/j.scitotenv.2020.136544

Strohmenger L., Fovet O., Akkal‐Corfini N., Dupas R., Durand P., Faucheux M., Gruau G., Hamon Y., Jaffrezic A., Minaudo C. , Petitjean P., Gascuel‐Odoux C. (2020) Multitemporal Relationships Between the Hydroclimate and Exports of Carbon, Nitrogen, and Phosphorus in a Small Agricultural Watershed. Water Resources Research 56 (7), e2019WR026323. DOI: 10.1029/2019WR026323

F. Kohanpour, S. Occhipinti, M. Lindsay, W. Gorczyk, F. Jourdan, M. Poujol (2020). Mineral systems prospectivity modelling for gold and nickel in the Halls Creek Orogen, Western Australia. Ore Geology Reviews, 127, 103809. DOI: 10.1016/j.oregeorev.2020.103809

Westerweel, J., Licht, A., Cogné, N., Roperch, P., Dupont‐Nivet, G., Kay Thi, M., et al. (2020). Burma Terrane collision and northward indentation in the Eastern Himalayas recorded in the Eocene‐Miocene Chindwin Basin (Myanmar). Tectonics, 39, e2020TC006413. DOI: 10.1029/2020TC006413

C. Lotout, M. Poujol, P. Pitra, Anczkiewicz, J. Van Den Driessche (2020). From burial to exhumation: emplacement and metamorphism of mafic eclogitic terranes constrained through multimethod petrochronology, case study from the Lévézou massif (French Massif Central, Variscan belt). Journal of Petrology, 61/4, egaa046. DOI: 10.1093/petrology/egaa046

Licht A, Win Z, Westerweel J, Cogné N, Morley CK, Chantraprasert S, Poblete F, Ugrai T, Nelson B, Aung DW, Dupont-Nivet G (2020) Magmatic history of central Myanmar and implications for the evolution of the Burma Terrane. Gondwana Research 87:303-319. doi:

Groulier P.-A., Turlin F., André-Mayer A.S., Ohnenstetter D., Crépon A., Boulvais P., Poujol M, Rollion-Bard C., Zeh A., Moukhsil A., Solgadi F., El Basbas A. (2020). Silicate-carbonate liquid immiscibility: insights from the Crevier alkaline intrusion (Québec). Journal of Petrology, 61/3, egaa033. DOI: 10.1093/petrology/egaa033

M. Ballevre, A. Camonin, P. Manzotti, M. Poujol (2020). A step towards unraveling the paleogeographic attribution of pre-Mesozoic basement complexes in the Western Alps based on U-Pb geochronology of Permian magmatism. Sous-Presse au Swiss Journal of Geoscience, 113. DOI: 10.1186/s00015-020-00367-1

O.M. Bankole, A. El Albani, A. Meunier, M. Poujol, A. Bekker (2020). Elemental geochemistry and Nd-isotope constraints on the provenance of the basal siliciclastic succession of the early Paleoproterozoic Francevillian Group, Gabon. Precambrian Research, 348,105874.  DOI: 10.1016/j.precamres.2020.105874

J. Akame, E.P. Oliveira, M. Poujol, G. Hublet, V. Debaille (2020). LA-ICP-MS zircon U-Pb dating, Lu-Hf, Sm-Nd geochronology and tectonic setting of the Mesoarchaean mafic and felsic magmatic rocks in the Sangmelima granite-greenstone terrane, Ntem Complex (South Cameroon). Lithos, 372/373, 105702. DOI: 10.1016/j.lithos.2020.105702

F. Hodel, A. Triantafyllou, J. Berger, M. Macouin, J-M Baele, N. Mattielli, C. Monnier, R. Ivan Ferreira da Trindade, M.N. Ducea, A. Chatir, N. Ennih, J. Langlade, M. Poujol (2020). Moroccan Anti-Atlas ophiolites: Timing and melting processes in an intra-oceanic arc-back-arc environment. Gondwana Research, 86, 182-202. DOI: 10.1016/

T Poitrenaud, M Poujol, R Augier, E Marcoux (2020). The multi-stage story of a late-Variscan W/Au deposit (Salau, French Pyrenees): Insights from REE and U/Pb LA-ICP-MS analyses. Mineralium Deposita, 55/6, 1127-1147. DOI: 10.1007/s00126-019-00923-2.

Uzel, J., Lagabrielle, Y., Fourcade, S., Chopin, C., Monchoux, P., Clec, C., Poujol, M (2020). The    sapphirine-bearing    rocks    in    contact    with    the    Lherz    peridotite    body:    new    mineralogical    data,    age    and    attempt    at    interpretation. BSGF-Earth Sciences Bulletin, 191, 5. DOI: 10.1051/bsgf/2019015

H. Legros, M. Harlaux, J. Mercadier, R.L. Romer, M. Poujol, A. Camacho, C. Marignac, M. Cuney, R. Cheng Wang, N. Charles, M.-Y. Lespinasse (2020). The world-class Nanling metallogenic belt (Jiangxi, China): W and Sn deposition at 160 Ma followed by 30 m.y. of hydrothermal metal redistribution. Ore Geology Reviews, 117, 103302. DOI: 10.1016/j.oregeorev.2019.103302

A. Bonilla, J.A. Franco, T. Cramer, M. Poujol, N. Cogné, S. Nachtergaele, J. de Grave (2020). Apatite LA-ICP-MS U/Pb and fission track geochronology of the Caño Viejita gabbro in E-Colombia: Evidence for Grenvillian intraplate rifting and Jurassic exhumation in the NW Amazonian Craton. Journal of South American Earth Sciences, 98, 102438. DOI: 10.1016/j.jsames.2019.102438

Cogné N, Chew DM, Donelick RA, Ansberque C (2020) LA-ICP-MS apatite fission track dating: A practical zeta-based approach. Chemical Geology 531:119302. doi:

Phd Thesis in 2020:

14/12/2020 : Maxime Bernard : « Modélisation et enregistrement morphologique, détritique et thermochronologique de l’érosion glaciaire ».

4/12/2020 Jan Westerweel : « The India-Asia collision from the perspective of Myanmar: Insights from paleomagnetism and paleogeographic reconstructions ».

09/10/2020 : Mathilde Mercuzot : « Reconstitutions paléoenvironnementales et paléoclimatiques en contexte tardi-orogénique : cas des bassins fini-carbonifères à permiens du nord-est du Massif central, France ».

07/10/2020 : Anthony Beauvois : « Comment l’organisation physique des agrégats nano-particulaires fer-matière organique contrôle-t-elle leur réactivité ? »

02/10/2020 : Rémi Coltat : « Interactions fluides-roches-déformation durant l’exhumation mantellique dans les marges hyper-étendues, la nappe de Platta, Alpes suisses ».