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We performed petrologic, radiometric (Ar-Ar, Sm-Nd, and Mn-Cr ages), and ion microprobe studies of the basaltic eucrite, EET90020. This is one of the few rare basaltic eucrites whose 39Ar-40Ar age has not been reset during impact bombardment on the HED parent body ≤4 Ga ago and, thus, should provide a unique opportunity to study the nature of the early thermal events on its parent body (presumably...
We conducted a petrologic study of 18 equilibrated eucrites with the goal of understanding the formation and evolution of the crust of asteroid 4 Vesta, the likely source of eucrite meteorites. Their textures indicate that eucrites were basaltic igneous rocks but modified by postcrystallization brecciation, recrystallization, and impact melting. Recrystallized rocks are the most common among clasts...
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