The age of the Pretoria Saltpan impact crater, South Africa

Details The age of the Pretoria Saltpan impact crater, South Africa The age of the Pretoria Saltpan impact crater, South Africa

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1365s&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1365-1366 (SEE N94-20636 05-91

Mathematics

Logic

1

Breccia, Core Sampling, Geochronology, Glass, Granite, Meteorite Craters, Republic Of South Africa, Fission, Fragments, Magnetic Fields, Separators

Scientific paper

The Pretoria Saltpan impact crater, situated about 40 km NNW of Pretoria, South Africa, has a diameter of about 1.13 km. The structure was formed in 2.05 Ga Nebo granite of the Bushveld Complex. The impact origin of the crater was recently established by the discovery of characteristic shock-metamorphic features in breccias found in drill cores at depths greater than 90 m. Impact glass fragments were recovered by standard magnetic separation techniques and handpicking from the melt breccias. As no reliable crater age was known so far, several hundred sub-millimeter-sized glass fragments were studied for fission tracks. The results show that the Saltpan impact crater has an age of 220 +/- 52 ka. This is in agreement with field geological observations.

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