Abstract

The Zambezi belt makes up part of the Late Proterozoic (Pan-African) network of orogenic belts in southern Africa. In Zambia, supracrustal rocks within the Zambezi belt are in contact with two extensive units of granitic augen gneiss, which have previously been interpreted as uplifted masses of remobilized sialic basement. Field relations and U-Pb zircon geochronologic data demonstrate that the gneisses are deformed batholiths that intruded the supracrustal sequence during two separate episodes of plutonism at ca. 1100 and 820 Ma. The Proterozoic tectonothermal evolution of the Zambezi belt thus involved production of voluminous granitic magmas. Isotopic ages for the batholiths place new constraints on the timing of major depositional and orogenic events within the belt and enable comparisons to be made with other parts of the regional Pan-African network.

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