Abstract
Results of a paleomagnetic study carried out on the exposed volcanic rocks on the western side of the South Kenya Rift Valley are presented. Nine stratigraphic groups ranging in age from Miocene to Pleistocene were sampled. The rocks consist of basalts, trachytes, nephelinites, melanephelinites, olivine melanephelinites and ignimbrites. Paleomagnetic poles obtained for different age ranges are as follows: Period I (0.64–0.72 Ma), 116°E, 85°N ( A 95 = 6°); Period II (1.6–6.9 Ma), 297°E, 84°N ( A 95 = 4°); Period III (12.0–15.0 Ma), 34°E, 80°N ( A 95 = 9°). The results for Period II show large secular variations which are in disagreement with the model predictions for near-equatorial sites.
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