The distribution of organic species is explored using data acquired from a new dual quadrupole system that routinely measures eighteen gaseous species. The process of condensation and its affect on gas distribution is modeled, and a new discrimination diagram based on total gaseous species and the CO2/N2 ratio is introduced.

We conclude that organic species concentrations indicate source; that pyrolysis of organic material produces significant aromatic compounds; that Fischer-Tropsch reactions produce organic species dominated by methane; CO2/N2 vs. total gas plots are useful for illustrating boiling and condensation processes; and Cerro Prieto gas concentration are consistent with the gaseous species being modified by input of magmatic volatiles.

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