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Kimberlite magmatism has occurred in cratonic regions on every continent. The global age distribution suggests that this form of mantle melting has been more prominent after 1.2 Ga, and notably between 250–50 Ma, than during early Earth history before 2 Ga (i.e., the Paleoproterozoic and Archean). Although preservation bias has been discussed as a possible reason for the skewed kimberlite age distribution,...
During impact, the passage of the shock wave results in extensive in situ fracturing and autochthonous target rock brecciation. Target material is excavated and ejected in ballistic trajectories upward and outward from the impact site. As excavation of the brecciated volume advances, the excavated crater is formed. It delimits the provenance of material expelled from the crater and provides the void...
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