Compressive deformation in the floor rocks to the Bushveld Complex (South Africa): evidence from the Rustenburg Fault Zone

Meso-Archaean and Palaeo-Proterozoic sedimentary sequence stratigraphy of the Kaapvaal Craton

“…uplift -rifting -thermal subsidence; uplift and rifting is related to essentially volcanic and immature sandy fluvial deposition, with thermal subsidence being inferred to have accommodated the two maj or epeiric marine (argillaceous) successions and references therein). Age data on the Pretoria-Segwagwa succession is limited: (1) 2316±7 Ma (Re-Os; Hannah et al, 2004) at the base of the groups; (2) detrital z ircons within the Timeball Hill sandstones, Daspoort and Magaliesberg arenites, respectively, at 2250±14/ 15 Ma, 2236±13 Ma and 2193±20 Ma, provide maximum ages for those units (Mapeo et al, 2006; similar data given by Dorland et al, 2004); (3) emplacement date for the Bushveld Complex (2058±0.8 Ma; Buick et al, 2001), which intrudes largely above the Magaliesberg Formation, provides a minimum age for the groups, although a deformational event separates temporally the underlying sedimentary from the intrusive igneous rocks (Bumby et al, 1998) (Fig. 17).…”

SHRIMP U–Pb zircon age for the Segwagwa–Masoke Igneous Complex of southeastern Botswana and implications for the deformation history of the Achaean to Proterozoic Transvaal Supergroup of southern Africa

“…Regionally, the Transvaal Supergroup is affected by E-verging thrust zones in the Griqualand West Basin (Altmann and Hälbich, 1991;Moen, 1999), and in the neighbourhood of the Vredefort Dome and Bushveld Igneous Complex the Lower Transvaal Supergroup is affected by complex and extensive foldand-thrust deformation (Alexandre et al, 2006). Bumby et al (1998) describe Type 1 and Type 2 interference folds within the Pretoria Group sedimentary rocks characterised by SE-NW trending folds which are folded by ENE-WSW trending folds. The geometry of these folds approximates folds in inliers of Pretoria Group sedimentary rocks in the Bushveld Complex (Hartzer, 1995).…”

“…Crocodile River Dome, Marble Hall Dome, etc.) (Hartzer, 1995;Bumby et al, 1998), thrusts and bed-parallel shear zones in the same rocks on the margins of the Vrederfort Dome (Alexandre et al, 2006). A major pre-Bushveld deformation event is favoured for much of the deformation seen in the Transvaal (Bushveld) Basin, whilst in the Griqualand West basin folding and thrusting of Transvaal rocks is thought to pre-date the Namaqua Kibaran tectonothermal events (Altmann and Hälbich, 1991).…”

“…The Bushveld-age rocks intrude the Neoachaean to Palaeoproterozoic Transvaal Supergroup of southern Africa and involve the emplacement of granites, syenites, diorites and felsic volcanic rocks (Key, 1983;Gould et al, 1987;Eriksson et al, 1993;Carney et al, 1994;Cheney and Winter de la, 1995;Eriksson and Reczko, 1995;Eales and Cawthorn, 1996;Bumby et al, 1998). These intrusive rocks in Botswana form oval plutonic complexes that are dated at ca.…”

Controls to hydrothermal gold mineralization in the Witwatersberg Goldfield; situated in the floor to the south of the Bushveld Complex, South Africa

“…The western part of the Witwatersberg Goldfield is transected by the Rustenburg Fault (Bumby et al, 1998) and lies west of the Brits Graben (Figs. 1 and 2).…”