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Evidence for K-rich terranes on Vesta from impact spherules

Abstract : The howardite-eucrite-diogenite (HED) clan is a group of meteorites that probably originate from the asteroid Vesta. Some of them are complex breccias that contain impact glasses whose compositions mirror that of their source regions. Some K-rich impact glasses (up to 2 wt% K2O) suggest that in addition to basalts and ultramafic cumulates, K-rich rocks are exposed on Vesta's surface. One K-rich glass (up to 6 wt% K2O), with a felsic composition, provides the first evidence of highly differentiated K-rich rocks on a large asteroid. They can be compared to the rare lunar granites and suggest that magmas generated in a large asteroid are more diverse than previously thought.
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Jean-Alix Barrat, Marcel Bohn, P. Gillet, A. Yamaguchi. Evidence for K-rich terranes on Vesta from impact spherules. Meteoritics and Planetary Science, Wiley, 2009, 44 (3), pp.359-374. ⟨insu-00401913⟩

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