STRATIGRAPHICAL SYNTHESIS OF THE METASEDIMENTS OF THE AGGENEYS TERRANE IN THE NAMAQUA MOBILE BELT

The supracrustal sequence of the Aggeneys terrane is regarded as a sub group of the Aggeneys Subgroup in the Bushman]and Group. The six forma tions which were identified are in decreasing order of age (with maxim um thicknesses in brackets): the Wortel (650 - 920 m), Witputs (230 m) , Skelmpoort (47 - 58 m), T'hammaberg (270 m), Hotson (500 m), and Koe ris (634 m) Formations. The uppermost part of the Hotson Formation (th e Gams Member) is the host for the economically important stratabound sulphide deposits. The Aggeneys Subgroup has been regionally metamorph osed to amphibolite grade and severely deformed. The sequence consists of quartz arenite (orthoquartzite), clay-rich rock (schist), arkose ( feldspathic gneiss with sporadic pebbles), conglomerate, calc-silicate rock, banded iron formation, and tholeiitic lava (amphibolite). Derai led stratigraphical columns for each formation illustrate the alternat ion of the various rock types.