%0 Journal Article %T Evidence for K-rich terranes on Vesta from impact spherules %+ Domaines Océaniques (LDO) %+ Université européenne de Bretagne - European University of Brittany (UEB) %+ Laboratoire de Sciences de la Terre (LST) %+ Antarctic Meteorite Research Center %A Barrat, Jean-Alix, J-A %A Bohn, Marcel %A Gillet, P. %A Yamaguchi, A. %< avec comité de lecture %@ 1086-9379 %J Meteoritics and Planetary Science %I Wiley %V 44 %N 3 %P 359-374 %8 2009-04-23 %D 2009 %Z Sciences of the Universe [physics]/Earth Sciences/Geochemistry %Z Environmental Sciences/Global ChangesJournal articles %X 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. %G English %2 https://insu.hal.science/insu-00401913/document %2 https://insu.hal.science/insu-00401913/file/maps-barrat.pdf %L insu-00401913 %U https://insu.hal.science/insu-00401913 %~ ENS-LYON %~ SDE %~ INSU %~ UNIV-BREST %~ CNRS %~ UNIV-LYON1 %~ PRUNEL %~ GIP-BE %~ LGO %~ CMM %~ UDL %~ UNIV-LYON %~ GEO-OCEAN