Shock Experiments on a Preheated Basaltic Eucrite
Shock metamorphism is one of the most important geologic processes occurring on meteorite parent bodies, as shock metamorphic effects are ubiquitous in meteorites . Impacts occurred during the early metamorphic and volcanic period, and after the bodies had cooled. At the early stages of evolution of the meteorite parent bodies, impacts may have affected these geologic events . Eucrites are pigeonite-plagioclase basalts and gabbros, and are among the oldest igneous rocks in the solar system, having been formed on the parent body at ~4.56 Ga. Almost all eucrites are shocked, brecciated, and metamorphosed, suggesting that impact metamorphism was a dominant geologic process on their parent body, 4 Vesta. Recently, it has been suggested that many eucrites were, in fact, shocked and brecciated during the early thermal metamorphism ,. Ibitira and EET90020 appear to have experienced shock heating during metamorphism , causing a partial melting of these rocks ~4.50 Ga ago ,. Thus, shock metamorphism certainly played an important role in evolution of the early, hot eucritic crust of the parent body.
KeywordsCrystallization Quartz Furnace Welding Epoxy
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