Further stratigraphic and structural constraints on the origin of the Bushveld Complex, South Africa

Details Further stratigraphic and structural constraints on the origin of the Bushveld Complex, South Africa Further stratigraphic and structural constraints on the origin of the Bushveld Complex, South Africa

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..169b&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 169.

Other

Meteoritic Composition, Stratigraphy, Hypervelocity Impact, Rock Mechanics, Breccia, Africa, Constraints, Melting, Magma

Scientific paper

Based partly on its lobate shape, previous workers have suggested that the Bushveld Complex of South Africa and associated rocks are the result of multiple meteorite impacts. According to this interpretation, parts of the lower Rooiberg Group, rocks forming the roof of the Complex, represent a sheet of impact melt breccia. However, extensive field work throughout the Rooiberg Group, and particularly at the contact between this unit and the underlying Transvaal Supergroup, has failed to identify any material that could be interpreted as impact melt breccia or other impact breccia. The Rooiberg Group apparently is wholly composed of volcanic flows and pyroclastic units representing several magma types which display distinct geochemical signatures interbedded with thin, laterally extensive sedimentary units. Structural evidence suggests that the lobate shape of the Complex is the result of post-Bushveld deformation. These data along with the absence of macroscopic or microscopic evidence of shock deformation in pre-Bushveld rocks of the area are inconsistent with formation of the Complex by impact.

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