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Analyse chimique des inclusions fluides par ablation laser couplée à l’ICP-MS et applications géochimiques

Abstract : The study of paleofluids by using fluid inclusions analysis is an important challenge in geochemistry. The LA-ICPMS technique allows enlarging the field of possibilities by determining the cationic content in fluid inclusions. Three aims, with LA-ICPMS as the thesis centre, are developed here: (i) the calibration of LA-ICPMS associated with a work on chimiometry give the possibility of this analytical technique and experimental protocol adapted; (ii) The development of a calculation method based on Pitzer’s themodynamic model. The quantification of cationic content (trace and major elements) is improved. In parallel, a software is developed to facilitate the processing of raw signal, (iii) the study of different targets is made. The Cl/Br concentration ratios are used to get information of the fluids origin. Then, a analysis on four different natural targets linked with silver deposits is realized. The last point is the feasabilty of the determination of rare earth element in fluid inclusion of Mac Arthur River (Uranium deposit, Canada)
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https://hal.univ-lorraine.fr/tel-01746317
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Mathieu Leisen. Analyse chimique des inclusions fluides par ablation laser couplée à l’ICP-MS et applications géochimiques. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10149⟩. ⟨tel-01746317⟩

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