Dating antarcic meteorites

Several scientists suggested these characteristics implied the origin of SNC meteorites from a relatively large parent body, possibly Mars.These trapped gases provided direct evidence for a Martian origin.NWA 2737 was found in Morocco or Western Sahara in August 2000 by meteorite hunters Bruno Fectay and Carine Bidaut, who gave it the temporary name "Diderot." It was shown by Beck et al.Among these, the famous specimen Allan Hills 84001 has a different rock type from other Martian meteorites: it is an orthopyroxenite (an igneous rock dominantly composed of orthopyroxene).In 2000, an article by Treiman, Gleason and Bogard gave a survey of all the arguments used to conclude the SNC meteorites (of which 14 had been found at the time) were from Mars.They wrote, "There seems little likelihood that the SNCs are not from Mars.As of April 25, 2018, 192 of the 207 Martian meteorites are divided into three rare groups of achondritic (stony) meteorites: shergottites (169), nakhlites (20), chassignites (3), and ones otherwise (15) (containing the orthopyroxenite (OPX) Allan Hills 84001, as well as 10 basaltic breccia meteorites).Consequently, Martian meteorites as a whole are sometimes referred to as the SNC group.

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This meteorite received much attention after an electron microscope revealed structures that were considered to be the fossilized remains of bacteria-like lifeforms.The majority of SNC meteorites are quite young compared to most other meteorites and seem to imply that volcanic activity was present on Mars only a few hundred million years ago.The young formation ages of Martian meteorites was one of the early recognized characteristics that suggested their origin from a planetary body such as Mars.which is a surprisingly young age considering how ancient the majority of the surface of Mars appears to be, and the small size of Mars itself.Because of this, some have advocated the idea that the shergottites are much older than this.

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