Dissemination and fractionation of projectile materials in the impact melts from Wabar Crater, Saudi Arabia

Physics

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Hypervelocity Projectiles, Impact Melts, Meteorite Craters, Meteoritic Composition, Fractionation, Petrography, Saudi Arabia

Scientific paper

Results are presented from the analyses of small ballistically dispersed melt samples (occurring in the form of aerodynamically shaped spheres, dumbbells, and teardrops) from the Wabar Crater (Saudi Arabia) and of melts from the Wabar and Nejed meteorites. On the basis of the data obtained and of models for crater forming processes it is concluded that the ballistically-dispersed glasses were formed from material at shallow levels in the target zone where temperatures were higher and where intimate physical contact with the disrupting impactor was achieved. Siderophile element fractionation was completed early, while the impactor was undergoing decompression and prior to mixing with the target glasses.

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