Significance of the Most Metamorphosed Eucrites

Details Significance of the Most Metamorphosed Eucrites Significance of the Most Metamorphosed Eucrites

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...41y&link_type=abstract

Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meteorites, p. 41

Mathematics

Logic

Asteroids, Basalt, Lava, Metamorphism (Geology), Meteoritic Composition, Vesta Asteroid, Textures, Nuclides, Pyroxenes, Regolith, Igneous Rocks

Scientific paper

Eucrites formed as basaltic lavas that erupted on the surface of an asteroid, presumably 4 Vesta. This volcanic epoch, which consisted of lava flows, fire fountains, and intrusions of narrow dikes, lasted only several million years, as shown by the presence of the decay product of short-lived nuclides in eucrites. In spite of the production of vast quantities of volcanic products, a striking feature of eucrites is that almost all of them are metamorphosed. This suggests a metamorphic event of global proportions, perhaps caused by burial as the thick (20 km) crust was constructed by a succession of lava flows. We have been studying the metamorphic record in basaltic eucrites to understand the geologic evolution of the crust of Vesta. We report here our observations on four of the most metamorphosed basaltic eucrites: (i.e., Millbillillie, RKPA 80205, EET 90020 and Ibitira.)

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