Figure 39. Changes in relative amounts of selected ionic species and ratios of ionic species. Peak intensity (relative amounts of species) increases to the right. Noticeable changes between responses in Frio and Vicksburg sections suggest different sources and /or migration pathways on either side of the Vicksburg seal. Frio fluid inclusions are relatively enriched in aromatics (Arm) and naphthalene (Nap). Vicksburg inclusions are enriched in paraffins (Par), in particular, CH4, C2H6, and C5-C13 species, as well as benzene and toluene.