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.
KeywordsShock Pressure Parent Body Shock Effect Shock Experiment Recovered Sample
Unable to display preview. Download preview PDF.
- A. Bischoff and D. Stöffler, Eur. J. Mineral. 4, p. 707 (1992).Google Scholar
- E.R.D. Scott, G.J. Taylor, H.E. Newsom, F. Herbert, M. Zolensky, and J.F. Kerridge, in Asteroid II (ed. R.P. Binzel, T. Geherels and MS. Matthews), Univ. Arizona Press, Tuscon, Arizona, p. 701 (1989).Google Scholar
- A. Yamaguchi, T. Sekine, and H. Mori, Lunar Sci. Conf. 31, CD-ROM, #1149 (1999).Google Scholar
- Basaltic Volcanism Study Project, Basaltic Volcanism on the Terrestrial Planets, Pergamon, New York, p. 1286 (1981).Google Scholar
- D. Stöffler. Fortschr. Miner. 49, p. 50 (1972).Google Scholar
- A. Yamaguchi, G.J. Taylor, and K. Keil, Antarct. Meteorite Res. 10, p. 431 (1997).Google Scholar
- J.S. Delaney and M. Prinz, in Field and Laboratory Investigations of Meteorites from Victoria Land and the Thiel Mountain Region, Antarctica, 1982–1983 and 1983–1984 (ed. U.B Marvin and G. J. MacPherson), Smithson. Contrib. Earth Sci. 28, p. 65 (1989).Google Scholar