1. Preparation and analytical conditions

Fluid inclusions are small cavities (e.g., 10– ^–3 –300 µm)  $\varnothing$  < 1,000 µm) found in igneous rocks (Figure  1 ), metamorphic, or sedimentary, which may, depending on the case, consist of one or more different phases (i.e., gas: CO ₂ , H ₂ O, N ₂ , etc.; liquid: CO ₂ , H ₂ ...