Abstract

The tectonic setting of the Archean Ngezi Group greenstones in the Belingwe Greenstone Belt, Zimbabwe, is controversial. Both autochthonous continental and oceanic settings have been proposed. The sedimentary facies of the basal Manjeri Formation have been logged in surface sections and in drill cores. Deposition occurred under fluviatile and shallow-marine conditions followed by alluvial fans and fan-deltas. Detrital mineralogy, rare-earth-element patterns, and Sm-Nd depleted-mantle model ages between 2.9 and 3.7 Ga are consistent with derivation from very local sources. The facies and geochemical association imply sedimentation in an extensional continental setting.

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