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New ⁴⁰Ar/³⁹Ar dating of the Clearwater Lake impact structures (Québec, Canada) - Not the binary asteroid impact it seems?

Trieloff, Mario; Osinski, Gordon R.; Schmieder, Martin +4 more

The two Clearwater Lake impact structures (Québec, Canada) are generally interpreted as a crater doublet formed by the impact of a binary asteroid. Here, arguments are presented that raise important questions about the proposed double impact scenario. New ⁴⁰Ar/³⁹Ar dating of two virtually fresh impact melt rock samples from t…

Evaluating the role of sulfide-weathering in the formation of sulfates or carbonates on Mars

Mangold, N.; Chevrier, V.; Dehouck, E. +3 more

Orbital and landed missions to Mars have revealed complex sulfate- and Fe-oxide-bearing mineralogical assemblages, which have been interpreted as the result of a late planet-wide acidic period due to large SO₂ emissions. However, this global scenario does not explain the recent discovery of Hesperian and Noachian-aged carbonates in seve…