The upper zone of the Bushveld Complex at Roossenekal, South Africa: geochemical stratigraphy and evidence of multiple episodesof magma replenishment

BY ROGER N. SCOON AND ANDREW A. MITCHELL.

Drill core from a fence of five boreholes located in the vicinity of Roossenekal, in the eastern limb of the Bushveld Complex, SouthAfrica, provides complete coverage of what is probably one of the thickest and most well-developed sections of the Upper Zone. The lowermost portions of the Rooiberg Group felsites that overlie the Upper Zone, and the uppermost portion of the Upper MainZone, which forms the footwall, were also intersected. Field relationships from floor-attached domes (eastern limb) and gap areas (western limb) reveal a marked angular unconformity at the base of the Upper Zone.