Abstract

A tectonic sequence has been determined for Precambrian basement structures of Ki-baran age (1100 ± 200 m.y.) in an area adjacent to the margin of the Western Rift Valley in Ankole District, southwestern Uganda. Plunges of one set of the structures in the sequence, tight folds (F4), and associated lineations, are dispersed about a 35°-trending subhorizontal axis which is subparallel to the rift trend of N. 30°E. in this area. This direction is not parallel to a local fold axial trend, however, and the dispersion of F4 is attributed, therefore, to basement warping related to Tertiary rifting.

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