The Fluid Inclusion Planes (FIP) are mode I cracks which occurs in sets with a predominant orientation perpendicular to the minimal stress axis σ3. They results from the healing of open crack and appear to be fossilized fluid pathways. One can use the physico-chemical differences in the included fluids to separate different sets of FIP. On the other hand, it should be possible to use FIP geometry to relate the differente stages of fluid percolation to a regional succession of deformational events. Therefore, the systematic measurements of microstructural marker orientations together with detailed fluid inclusion and host mineral characterization may results in the determination of fluid pathways as a function of the changes occuring in the stress field.