Abstract
The Belingwe greenstone belt, Rhodesia, contains a succession of Archaean lavas and sedimentary rocks which display features of critical importance for an understanding of their genesis. These include: (1) A well-exposed unconformable basal contact of shallow-water sediments on granitic crust. (2) Stromatolitic limestones between 2500 and 2800 m.y. old and comparable in age to the oldest so far described. (3) A suite of extrusive peridotitic and basaltic komatiites overlying the basal sediments. These relationships imply that peridotitic and basaltic komatiites were here extruded directly over granitic crust.
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