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The almost circular Roter Kamm impact crater, in 1200 Ma granitic gneiss of the Namaqua Metamorphic Complex of the southern Namib Desert, has a diameter of 2.5 km and an age of 4–5 Ma. A variable orientation of the foliation in the rim gneisses is suggestive of large-scale brecciation of the rim. Along some parts of the rim, the average orientation of the foliation in the rim gneisses is tangential, along other parts it is radial, and along still other parts it is random. New analyses of large samples of the rim gneisses demonstrate a large-scale chemical heterogeneity of the...

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