We have developed an experimental protocol aimed at analyzing and imaging single fluid inclusions using the X-ray microfluorescence set up installed on line ID22 of the European Synchrotron Research Facility. (ESRF ; Ménez et al., 1999; 2001; 2002 ; Philippot et al., 1998, 2000 ; 2001). Concentration and spatial distribution of major (Cl, K, Ca, Mn, Fe) and trace elements (Ti, Cu, Ni, Zn, V, As, Ba, Br, Rb, Sr, Au, Ce, Hf, Nb, Zr, Th, Pb, U) were determined in individual fluid inclusions from from the Dunbar oil reservoir, North Sea, and a variety of ore deposits worldwide. These include: Chivar emarald deposit (Columbia), Au-bearing quartz veins from Brusson (Switzerland), Cevennes (France), Getchell (USA) minning districts, and quartz veins of the Streltsov (Russia), Oklo (Gabon) and Calamar (Australia) uranium deposits. High-spatial resolution fluorescence X-ray maps and micro-tomography were collected for several fluid inclusions. 2D and 3D images allowed the visualisation of the distribution of chemical species between liquid, vapour and solid phases within individual inclusions. An important observation is that, although most inclusion analysed are two phases (liquid+vapor) at room temperature, a majority of elements are not homogeneously distributed but rather form zones of different dimensions and count rates throughout the inclusions. Different possibilities may account for this heterogeneous elemental distribution. These include subnanometer thin film precipitated on the inclusion wall, randomly distributed inframicrometric solid phases or aggregates, element partitioning between solid and vapor phases. Element concentration estimates can be achieved either by in situ homogenisation of the fluid inclusion using a furnace installed directly on the beam or via a quantitative imaging method using dynamic analysis. Ménez B, Philippot P., Mosbah M., Gibert F., 1999, NIMB, 158, 533-537. Ménez B., Simionovici A., Philippot P., Bohic, S., Gibert, A, Chukalina M. 2001. NIM B 181, 749-754 Ménez B., Philippot P., Bonnin-Mosbah M., Simionovici A., Gibert, F., 2002. Geochim. Cosmochim. Acta, in press Philippot P., Ménez B., Chevallier P., Gibert F., Legrand F., Populus, P. 1998 Chem. Geol., 144, 121-136. Philippot P., Ménez B., Simionovici A., Cuney M., Chabiron A., Snigirev A., 2000. Terra Nova, 12, 84 - 89 Philippot P., Ménez B., Drakopoulos M., Simionovici A., Snigirev A. 2001. Chem. Geol., 173, 151-158.
AGU Spring Meeting Abstracts
- Pub Date:
- May 2002
- 3670 Minor and trace element composition;
- 4807 Chemical speciation and complexation;
- 1065 Trace elements (3670);
- 1094 Instruments and techniques