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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6348

Title: Shear wave velocity structure of the Bushveld Complex, South Africa
Authors: Kgaswane, EM
Nyblade, AA
Julià, J
Dirks, PHGM
Webb, SJ
Keywords: Bushveld Complex
Continuous-sheet model
Dipping-sheet model
Joint inversion
Receiver functions
Rayleigh wave group velocities
Issue Date: Jul-2012
Publisher: Elsevier
Citation: Kgaswane, E.M, Nyblade, A.A, Durrheim, R.J, Julià, J, Dirks, P.H.G.M and Webb, S.J. 2012. Shear wave velocity structure of the Bushveld Complex, South Africa. Tectonophysics, Vol. 554-557, pp. 83-104
Series/Report no.: Workflow;9274
Abstract: The structure of the crust in the environs of the Bushveld Complex has been investigated by jointly inverting high-frequency teleseismic receiver functions and 2–60 s period Rayleigh wave group velocities for 16 broadband seismic stations located across the Bushveld Complex. Group velocities for 2–15 s periods were obtained from surface wave tomography using local and regional events, while group velocities for 20–60 s periods were taken from a published model. 1-D shear wave velocity models obtained for each station show the presence of thickened crust in the center of the Bushveld Complex and a region at the base of the crust where shear wave velocities exceed 4.0 km/s. The shear wave velocity models also suggest that velocities in some upper crustal layers may be as high as 3.7–3.8 km/s, consistent with the presence of mafic lithologies. These results favor a continuous-sheet model for the Bushveld Complex in which the outcropping mafic layers of the western and eastern limbs are continuous at depth beneath the center of the complex. However, detailed modeling of receiver functions at one station within the center of the complex indicates that the mafic layering may be locally disrupted due to thermal diapirism triggered by the emplacement of the Bushveld Complex or thermal and tectonic reactivation at a later time.
Description: Copyright: This is an Open Access article, and is publicly available.
URI: http://www.sciencedirect.com/science/article/pii/S0040195112003095
ISSN: 0040-1951
Appears in Collections:Mining and geoscience
General science, engineering & technology

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