Tectonics and volcanism on Mars.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The recent knowledge on Mars' lithosphere evolution does not find sufficient analogies with the Earth's tectonic models. The Viking images' interpretation, focused on the Arsia Mons region (Tharsis Montes), highlights, for the first time, two lineament systems, previously unknown and not directly linked to volcano-tectonics. Their mutual relations recall a typical brittle tectonic model, conformed to horizontal movements which give rise to transcurrent faults. The Arsia Mons volcano appears to be settled near the convergence area between the two fault systems, that is, where one can presume the fracturing extensional conditions are more favourable to the magmatic flows. The comparison and the close analogy with earthly models (Etnean volcanic district, Sicily), well known as belonging to plate tectonics, presume that on the Arsia region too regional stresses and strains, due to relic horizontal crust movements, could have existed.

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