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

2003 ◽  
Vol 106 (2-3) ◽  
pp. 205-212 ◽  
Author(s):  
W. Pretorius
Keyword(s):  
South Africa ◽  
Upper Mantle ◽  
Central Zone ◽  
Compressional Wave ◽  
Lithospheric Structure ◽  
Wave Velocities ◽  
Limpopo Belt

Petrogenesis of ultramafic rocks of komatiitic composition from the Central Zone of the Limpopo Belt, South Africa: Evidence from O and H isotopes

2018 ◽  
Vol 147 ◽  
pp. 68-77
Author(s):  
Tapabrato Sarkar ◽  
Elena O. Dubinina ◽  
Chris Harris ◽  
Wolfgang D. Maier ◽  
Hassina Mouri
Keyword(s):  
South Africa ◽  
Central Zone ◽  
Ultramafic Rocks ◽  
Limpopo Belt

SEISMIC STUDIES ON THE EASTERN SEABOARD OF CANADA: THE ATLANTIC COAST OF NOVA SCOTIA

1964 ◽  
Vol 1 (1) ◽  
pp. 10-22 ◽  
Author(s):  
D. L. Barrett ◽  
M. Berry ◽  
J. E. Blanchard ◽  
M. J. Keen ◽  
R. E. McAllister
Keyword(s):  
Nova Scotia ◽  
Upper Mantle ◽  
Atlantic Coast ◽  
Seismic Refraction ◽  
Compressional Wave ◽  
Crust And Upper Mantle ◽  
Compressional Waves ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Eastern Seaboard

The results of seismic refraction profiles on the Atlantic coast of Nova Scotia and on the continental shelf off Nova Scotia are presented. Compressional and shear waves have been observed in the crust and mantle and suggest that the thickness of the crust is about 34 km. The compressional wave velocities recorded in the main crust and upper mantle are 6.10 and 8.11 km s−1 respectively. No compressional waves with values of velocity between these values can be identified, and this suggests that any "intermediate" layer is thin or absent. The corresponding shear wave velocities are 3.68 and 4.53 km s−1. Values of Poisson's ratio in the crust and mantle are 0.22 and 0.28. Alternative models of the crust which, on the evidence of travel times, might fit the observed results are discussed.

The behaviour of Nd and Pb isotopes during 2.0 Ga migmatization in paragneisses of the Central Zone of the Limpopo Belt (South Africa and Botswana)

2001 ◽  
Vol 112 (1-2) ◽  
pp. 51-86 ◽  
Author(s):  
Valérie Chavagnac ◽  
Jan D Kramers ◽  
Thomas F Nägler ◽  
Lorenz Holzer
Keyword(s):  
South Africa ◽  
Central Zone ◽  
Pb Isotopes ◽  
Limpopo Belt

Seismic study of crustal structure in Pennsylvania and New York*

1955 ◽  
Vol 45 (4) ◽  
pp. 303-325 ◽  
Author(s):  
Samuel Katz
Keyword(s):  
New York ◽  
Elastic Wave ◽  
Upper Mantle ◽  
Compressional Wave ◽  
Compressional Wave Velocity ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Central Pennsylvania ◽  
Significant Difference ◽  
Mohorovičić Discontinuity

Abstract Blasts at two quarries in northern New York and central Pennsylvania have been recorded to a distance of 309 km. The data indicate an essentially homogeneous, unlayered crust, with elastic wave velocities possibly increasing with depth. An average crustal thickness for the region is 34.4 km., with no indication of significant difference in thickness between the two areas. Observed compressional wave velocities for the crust are 6.39 and 6.31 km/sec. for New York, and 6.04 km/sec. for Pennsylvania. The corresponding shear wave velocities are 3.62 and 3.60 km/sec., and 3.61 km/sec. Average upper mantle velocities are 8.14 km/sec. for Pn and 4.69 km/sec. for Sn. The compressional wave velocity of anorthosite near Tahawus, N.Y., is 6.63 km/sec. No near-vertical reflections from the Mohorovičić discontinuity were observed.

Geochronological evidence for Archaean and Palaeoproterozoic polymetamorphism in the Central Zone of the Limpopo Belt, South Africa

2018 ◽  
Vol 310 ◽  
pp. 320-347 ◽  
Author(s):  
Alfred Kröner ◽  
Günther Brandl ◽  
Sönke Brandt ◽  
Reiner Klemd ◽  
Hangqiang Xie
Keyword(s):  
South Africa ◽  
Central Zone ◽  
Geochronological Evidence ◽  
Limpopo Belt
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