The Charnockitic Rocks of the Sand-Covered Morokweng Impact Structure, Southern Kalahari, South Africa: Evidence for a Possible Impact Melt Origin

Details The Charnockitic Rocks of the Sand-Covered Morokweng Impact Structure, Southern Kalahari, South Africa: Evidence for a Possible Impact Melt Origin The Charnockitic Rocks of the Sand-Covered Morokweng Impact Structure, Southern Kalahari, South Africa: Evidence for a Possible Impact Melt Origin

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...29a&link_type=abstract

Lunar and Planetary Science, volume 27, page 29

Computer Science

2

Scientific paper

The recently discovered Morokweng Impact Structure (MIS) is located in the North West Province of South Africa, about 140 km NW of Vryburg and 100 km south of the Botswana border. Although entirely buried by Phanerozoic sediments, the MIS was recognized by examining cores from five boreholes drilled in a circular airborne magnetic anomaly, previously interpreted as a plug-like intrusion. The MIS apparently consists of an eroded, multi-ring crater with an original diameter probably in excess of 70 km and an approximate age of 1.4 +/- 0.2 Ga. The core of the structure hosts a texturally complex, sheet-like body (diameter about 30 km, maximum thickness about 120 m) of weakly differentiated plutonic rocks ranging from charnockite and charnoenderbite to quartz-norite. Here we report how multiple intrusive pulses, incipient fractionation, frequency of clasts, anomalous Ir, Ni, Cr contents, and disseminated Ni-rich spinels/oxides may be explained by impact melting of target rocks and a relatively protracted cooling history.

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