Late Jurassic age for the Morokweng impact structure, southern Africa

Details Late Jurassic age for the Morokweng impact structure, southern Africa Late Jurassic age for the Morokweng impact structure, southern Africa

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.147...25h&link_type=abstract

Earth and Planetary Science Letters, Volume 147, Issue 1-4, p. 25-35.

Physics

23

Scientific paper

A roughly 70 km diameter circular feature buried beneath the Kalahari sands in South Africa is revealed on regional aeromagnetic maps. Boreholes drilled into the centre of the structure intercept a ~ 250 m thick sheet of quartz norite, interpreted as an impact melt, which overlies brecciated and shock metamorphosed basement granite. Zircons recovered from the quartz norite, yield U-Pb ages of 145 +/- 0.8 Ma, and biotites provide Ar-Ar ages of 144 +/- 4 Ma. These data provide strong evidence for the occurrence of a Late Jurassic impact crater (the Morokweng impact structure) ~ 100 m beneath the surface.

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