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Shear wave velocity structure of the lower crust in southern Africa: Evidence for compositional heterogeneity within Archaean and Proterozoic terrains
The nature of the lower crust across the southern African shield has been investigated by jointly inverting receiver functions and Rayleigh wave group velocities for 89 broadband seismic stations located in Botswana, South Africa and Zimbabwe. For large parts of both Archaean and Proterozoic terrain...
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| Published in: | Journal of Geophysical Research. B. Solid Earth 2009-12, Vol.114 (B12), p.n/a |
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| Main Authors: | , , , , , |
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| cites | cdi_FETCH-LOGICAL-a4917-4d806c8a4e80b9fadeabe0fda3a5d326b78a59fd193014a06b1f3642f51d4f4b3 |
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| container_title | Journal of Geophysical Research. B. Solid Earth |
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| creator | Kgaswane, Eldridge M. Nyblade, Andrew A. Julià, Jordi Dirks, Paul H. G. M. Durrheim, Raymond J. Pasyanos, Michael E. |
| description | The nature of the lower crust across the southern African shield has been investigated by jointly inverting receiver functions and Rayleigh wave group velocities for 89 broadband seismic stations located in Botswana, South Africa and Zimbabwe. For large parts of both Archaean and Proterozoic terrains, the velocity models obtained from the inversions show shear wave velocities ≥4.0 km/s below ∼20–30 km depth, indicating a predominantly mafic lower crust. However, for much of the Kimberley terrain and adjacent parts of the Kheis Province and Witwatersrand terrain in South Africa, as well as for the western part of the Tokwe terrain in Zimbabwe, shear wave velocities of ≤3.9 km/s are found below ∼20–30 km depth, indicating an intermediate‐to‐felsic lower crust. The areas of intermediate‐to‐felsic lower crust in South Africa coincide with regions where Ventersdorp rocks have been preserved, suggesting that the more evolved composition of the lower crust may have resulted from crustal reworking and extension during the Ventersdorp tectonomagmatic event at c. 2.7 Ga. |
| doi_str_mv | 10.1029/2008JB006217 |
| format | article |
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However, for much of the Kimberley terrain and adjacent parts of the Kheis Province and Witwatersrand terrain in South Africa, as well as for the western part of the Tokwe terrain in Zimbabwe, shear wave velocities of ≤3.9 km/s are found below ∼20–30 km depth, indicating an intermediate‐to‐felsic lower crust. 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G. M.</creatorcontrib><creatorcontrib>Durrheim, Raymond J.</creatorcontrib><creatorcontrib>Pasyanos, Michael E.</creatorcontrib><title>Shear wave velocity structure of the lower crust in southern Africa: Evidence for compositional heterogeneity within Archaean and Proterozoic terrains</title><title>Journal of Geophysical Research. B. Solid Earth</title><addtitle>J. Geophys. Res</addtitle><description>The nature of the lower crust across the southern African shield has been investigated by jointly inverting receiver functions and Rayleigh wave group velocities for 89 broadband seismic stations located in Botswana, South Africa and Zimbabwe. For large parts of both Archaean and Proterozoic terrains, the velocity models obtained from the inversions show shear wave velocities ≥4.0 km/s below ∼20–30 km depth, indicating a predominantly mafic lower crust. However, for much of the Kimberley terrain and adjacent parts of the Kheis Province and Witwatersrand terrain in South Africa, as well as for the western part of the Tokwe terrain in Zimbabwe, shear wave velocities of ≤3.9 km/s are found below ∼20–30 km depth, indicating an intermediate‐to‐felsic lower crust. 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| identifier | ISSN: 0148-0227 |
| ispartof | Journal of Geophysical Research. B. Solid Earth, 2009-12, Vol.114 (B12), p.n/a |
| issn | 0148-0227 2169-9313 2156-2202 2169-9356 |
| language | eng |
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| source | Wiley-Blackwell AGU Digital Library; Wiley-Blackwell Read & Publish Collection; Alma/SFX Local Collection |
| subjects | Earth sciences Earth, ocean, space Exact sciences and technology Geology Geophysics Heterogeneity intermediate to felsic lower crust mafic Seismology Surface waves Wave velocity |
| title | Shear wave velocity structure of the lower crust in southern Africa: Evidence for compositional heterogeneity within Archaean and Proterozoic terrains |
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