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Shear wave velocity structure of the Bushveld Complex, South Africa

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dc.contributor.author Kgaswane, EM
dc.contributor.author Nyblade, AA
dc.contributor.author Julià, J
dc.contributor.author Dirks, PHGM
dc.contributor.author Webb, SJ
dc.date.accessioned 2012-11-21T08:56:57Z
dc.date.available 2012-11-21T08:56:57Z
dc.date.issued 2012-07
dc.identifier.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 en_US
dc.identifier.issn 0040-1951
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0040195112003095
dc.identifier.uri http://hdl.handle.net/10204/6348
dc.description Copyright: This is an Open Access article, and is publicly available. en_US
dc.description.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. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;9274
dc.subject Bushveld Complex en_US
dc.subject Continuous-sheet model en_US
dc.subject Dipping-sheet model en_US
dc.subject Joint inversion en_US
dc.subject Receiver functions en_US
dc.subject Rayleigh wave group velocities en_US
dc.title Shear wave velocity structure of the Bushveld Complex, South Africa en_US
dc.type Article en_US
dc.identifier.apacitation Kgaswane, E., Nyblade, A., Julià, J., Dirks, P., & Webb, S. (2012). Shear wave velocity structure of the Bushveld Complex, South Africa. http://hdl.handle.net/10204/6348 en_ZA
dc.identifier.chicagocitation Kgaswane, EM, AA Nyblade, J Julià, PHGM Dirks, and SJ Webb "Shear wave velocity structure of the Bushveld Complex, South Africa." (2012) http://hdl.handle.net/10204/6348 en_ZA
dc.identifier.vancouvercitation Kgaswane E, Nyblade A, Julià J, Dirks P, Webb S. Shear wave velocity structure of the Bushveld Complex, South Africa. 2012; http://hdl.handle.net/10204/6348. en_ZA
dc.identifier.ris TY - Article AU - Kgaswane, EM AU - Nyblade, AA AU - Julià, J AU - Dirks, PHGM AU - Webb, SJ AB - 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. DA - 2012-07 DB - ResearchSpace DP - CSIR KW - Bushveld Complex KW - Continuous-sheet model KW - Dipping-sheet model KW - Joint inversion KW - Receiver functions KW - Rayleigh wave group velocities LK - https://researchspace.csir.co.za PY - 2012 SM - 0040-1951 T1 - Shear wave velocity structure of the Bushveld Complex, South Africa TI - Shear wave velocity structure of the Bushveld Complex, South Africa UR - http://hdl.handle.net/10204/6348 ER - en_ZA


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