Abiotic Synthesis of Hydrocarbons on Mars: Theoretical Modeling of Metastable Equilibria

Mathematics – Logic

Scientific paper

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Carbonates, Hydrocarbons, Metastable State, Polycyclic Aromatic Hydrocarbons, Snc Meteorites, Planetary Temperature, Quartz, Fayalite, Magnetite, Volcanology

Scientific paper

The martian meteorite ALH84001 contains polycyclic aromatic hydrocarbons (PAHs) and other hydrocarbons of endogenous origin. It has been proposed that the presence of PAHs in carbonate globules of ALH84001 indicates biological activity on ancient Mars. On the other hand, the presence of hydrocarbons in other meteorites, interstellar clouds, and Earth's pristine and altered igneous rocks (e.g., serpentinites) is not attributed to biological sources. In many cases these hydrocarbons are formed abiotically due to reduction of C oxides by H. We used thermodynamic calculations of metastable equilibria to evaluate the possibility of abiotic synthesis of PAHs and n-alkanes in possible hydrothermal fluids and thermal gases on Mars.

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