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South African Journal of Geology; September 2003; v. 106; no. 2-3; p. 205-212; DOI: 10.2113/106.2-3.205
© 2003 Geological Society of South Africa
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Article

Measured and calculated compressional wave velocities of crustal and upper mantle rocks in the Central Zone of the Limpopo Belt, South Africa – implications for lithospheric structure

W. Pretorius

Department of Geological Sciences, Queen’s University, Kingston, Ontario, Canada, K7L 3N6.

J.M. Barton, Jr

Department of Geology, Rand Afrikaans University, P.O. Box 524 Auckland Park, 2006, Republic of South Africa. e-mail: jmb{at}na.rau.ac.za

Experimental compressional wave velocity (Vp) measurements were performed on felsic metasedimentary and igneous lithologies belonging to the Beit Bridge Group, and other amphibolite facies rocks, found in and around the Venetia Kimberlite pipes, which intrude the Central Zone of the Limpopo Belt. Xenoliths of eclogite, granulite, gabbronorite and garnet-quartz, which represent the major crustal and upper mantle lithologies found in the kimberlite host rock were too small for experimental measurements. Compressional wave velocities for these samples were calculated, based on their modal mineralogy and end member mineral compositions. Compressional wave velocities were corrected for in-situ conditions based on estimated equilibration temperatures and pressures, and the resulting velocities were compared with the seismic refraction model of the Limpopo Belt, in order to construct a lithologic column of the crust and upper mantle below the Venetia Mine.




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 Geological Society of America Special PapersHome page
J.M. Barton Jr., R. Klemd, and A. Zeh
The Limpopo Belt: A result of Archean to Proterozoic, Turkic-type orogenesis?
Geological Society of America Special Papers, January 1, 2006; 405(0): 315 - 332.
[Abstract] [Full Text] [PDF]

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 South African Journal of GeologyHome page
J.M. Barton Jr., W.P. Barnett, E.S. Barton, M. Barnett, A. Doorgapershad, C. Twiggs, R. Klemd, J. Martin, L. Mellonig, and R. Zenglein
The geology of the area surrounding the Venetia kimberlite pipes, Limpopo Belt, South Africa: A complex interplay of nappe tectonics and granitoid magmatism
South African Journal of Geology, September 1, 2003; 106(2-3): 109 - 128.
[Abstract] [Full Text] [PDF]

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 South African Journal of GeologyHome page
W. Pretorius and J.M. Barton Jr.
Petrology and geochemistry of crustal and upper mantle xenoliths from the Venetia Diamond Mine - evidence for Archean crustal growth and subduction
South African Journal of Geology, September 1, 2003; 106(2-3): 213 - 230.
[Abstract] [Full Text] [PDF]


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