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There is also an increase in the ratio of pyroclastics t o flows with stratigraphic height with coarse pyroclastics being most frequent in the Felsic Formation. Significant detrital sediments occur only in the Shamvaian Group at the top of the section. , 1976). The base of the succession is poorly exposed, but apparently unconformably underlying it is a sequence of highly deformed meta-arkoses interlayered with amphibolite, schist, and ultramafic rocks. The Lady Mary Formation, which comprises the lower one-third of the Tati succession, is composed chiefly of mafic and ultramafic flows and sills with minor felsic tuff,’ arkose, and chert, and very minor carbonate (Fig, 2-2C).
Sediments are notably uncommon in the sequence. There is also an increase in the ratio of pyroclastics t o flows with stratigraphic height with coarse pyroclastics being most frequent in the Felsic Formation. Significant detrital sediments occur only in the Shamvaian Group at the top of the section. , 1976). The base of the succession is poorly exposed, but apparently unconformably underlying it is a sequence of highly deformed meta-arkoses interlayered with amphibolite, schist, and ultramafic rocks.
It is bounded on the north, east, and south by Precambrian mobile belts (Fig. 1-12) which, in part, contain reworked rocks of the Rhodesian Province. , 1976). Approximately 83% of the rocks in the province are gneisses and various granitic rocks with the remainder being chiefly greenstone belts (Anhaeusser, 1976a). The structural grain in the province is complex and reflects polyphase deformation and diapiric plutonism (Macgregor, 1951). Three trends are recognized (Fig. 1-12) by Wilson (1973a): NNE, NW, and ENE.