Palaeomagnetic results from late Archaean and early proterozoic granites from South Western Kenya

Abstract

Results of a palaeomagnetic study carried out on the Migori granites exposed in the South Western part of Kenya are presented. The granites of Post-Nyanzian and Post-Kavirondian ages are dated at View the MathML source, respectively, using the whole rock RbSr isochron method. Alternating frequency and thermal demagnetization techniques have been used to isolate characteristic components of natural remanence. Opaque petrological and thermomagnetic studies indicate titanomagnetite grains as the main carrier of the primary component. The mean palaeomagnetic poles for the Post-Nyanzian and the Post-Kavirondian granites are located at 336°E, 72°N (View the MathML source) and 263°E, 41°N (View the MathML source), respectively.