Fig. 2 Electron backscattered (BSE) characteristic images of craters generated by hypervelocity impact experiments on the Gibeon iron meteorite target.

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Fig. 2 Electron backscattered (BSE) characteristic images of craters generated by hypervelocity impact experiments on the Gibeon iron meteorite target chunks using both dunite and basalt projectiles. Electron backscattered (BSE) characteristic images of craters generated by hypervelocity impact experiments on the Gibeon iron meteorite target chunks using both dunite and basalt projectiles. (A) #101 dunite at 3.25 km/s at room temperature. The crater’s morphology is a typical bowl-like shape with a clear darkening of its interior. Notice that the crater’s metallic rims are irregular and largely protruding. (B) #102 dunite at 3.28 km/s at 151 K. This bowl-like shape crater is obtained in the same experimental conditions than run #101, but the dwell target temperature was set at 151 K. Similar features are observable, except the tearing off part of the crater wall on its left part (see section S6). (C) #103 dunite at 6.97 km/s at room temperature. This is the higher-velocity impact crater obtained with a dunite projectile. Its interior consists of a frozen emulsion of metal-silicate immiscible liquids. (D) #107 basalt at 5.08 km/s at 131 K. The darkening of the inside of the crater is more pronounced than in the other impact experiments using dunite as a projectile. Concentric cracks are also present. (E) Electron backscattered SEM image showing the dunite-like glassy coating (pink) of the run #103 iron crater surface (green) on its sides. The glassy coating contains numerous bubbles. (F) Electron backscattered SEM image showing the basalt-like glassy coating (pink) of the #107 crater. Notice here the heterogeneous thickness of the glassy coating and its foamy texture (iron-rich materials are in green). Guy Libourel et al. Sci Adv 2019;5:eaav3971 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).