January 1957
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3 Reads
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28 Citations
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Publications (1)
Citations (1)
... Undersaturated complexes (Spitskop, Pilanesberg) including carbonatites with ages ranging between 1435 and 1100 Ma (Ferguson, 1973) cut the Bushveldt complex (2050e1950 Ma) … Another famous African alkaline ring is the 2.05 Ga Phalaborwa massif (e.g. Yuhara et al., 2005) which was considered by Holmes and Cahen (1957) as the oldest known alkaline ring complex in Africa. Furthermore, Mauritania hosts also some old alkaline intrusions as the mixed silica-saturated and undersaturated complex syenites of Hassi el Fogra complex with an age of 2000 Ma (this complex was considered by Lameyre and Lasserre (1967) as the oldest ring complex known in the world), and the 1700 Ma Tabatanat complex (Rocci, 1960). ...
- Citing Article
January 1957