Roter Kamm crater
Roter Kamm (German: Red Ridge) is a meteorite crater, located in the Sperrgebiet, within the Namibian section of the Namib Desert, approximately 80 kilometres north of Oranjemund and 12 kilometres southwest of Aurus Mountain in the ǁKaras Region. The crater is 2.5 kilometres in diameter and is 130 metres deep. The age is estimated at 4.81 ± 0.5 Ma, placing it in the Pliocene. The crater is exposed at the surface, but its original floor is covered by sand deposits at least 100 metres thick.
Description
The meteorite hit a layer of Precambrian granitic gneiss that is part of the Namaqua Metamorphic Complex, overlaid with some younger sedimentary rocks. No parts of the meteorite have been found, suggesting that it completely evaporated upon impact. The meteor that hit it was approximately the size of an SUV.
The Roter Kamm impact structure exposes a large volume of cataclastic/mylonitic and pseudotachylitic breccias in the basement granite and gneisses, which is unusual for small craters. Anomalous quartz found at the rim of the crater, and the primary fluid inclusions in the quartz, seem to provide evidence for post-impact hydrothermal activity, generated by impact heat, at the Roter Kamm impact crater. Eolian and alluvial processes each played a role in modifying the Roter Kamm impact crater since its formation. Much of the more recent history of crater modification relates to eolian processes. Active mobile sands largely bury the crater and effectively mask most of the signatures associated with prior activity by other processes. Ongoing eolian erosion is responsible for scouring of the exposed rim.
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