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The Vredefort Structure is the type locality for pseudotachylite, a type of clast-laden melt breccia often observed in tectonic zones of brittle or brittle-ductile deformation and generally believed to be the result of frictional melting. Pseudotachylitic breccia is also abundant in the Sudbury Structure and the Roter Kamm impact crater, as well as in the northern part of the Witwatersrand Basin surrounding the Vredefort Dome. In order to facilitate comparison between pseudotachylites from Vredefort and from impact structures and tectonic settings, the existing data base is reviewed and recent field and laboratory observations summarized. Modes of breccia occurrences, petrographic appearance,...

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