scholarly journals Coupled Crust‐Mantle Evolution for > 2 Gy in Southern Africa from Exceptionally Strong Crustal Anisotropy

2021 ◽  
Vol 95 (S1) ◽  
pp. 44-47
Author(s):  
Hans THYBO ◽  
Mohammad YOUSSUF ◽  
Irina M. ARTEMIEVA
Keyword(s):  
Southern Africa ◽  
Crustal Anisotropy ◽  
Mantle Evolution

scholarly journals Lithospheric mantle evolution monitored by overlapping large igneous provinces: Case study in southern Africa

Lithos ◽  
2009 ◽  
Vol 107 (3-4) ◽  
pp. 257-268 ◽  
Author(s):  
F. Jourdan ◽  
H. Bertrand ◽  
G. Féraud ◽  
B. Le Gall ◽  
M.K. Watkeys
Keyword(s):  
Southern Africa ◽  
Lithospheric Mantle ◽  
Large Igneous Provinces ◽  
Mantle Evolution ◽  
Igneous Provinces

scholarly journals Southern Africa crustal anisotropy reveals coupled crust-mantle evolution for over 2 billion years

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
H. Thybo ◽  
M. Youssof ◽  
I. M. Artemieva
Keyword(s):  
Southern Africa ◽  
Seismic Anisotropy ◽  
Receiver Function ◽  
Function Analysis ◽  
Splitting Method ◽  
Long Term Stability ◽  
Mantle Evolution ◽  
Sks Splitting ◽  
Fold Belts ◽  
Receiver Function Analysis

AbstractThe long-term stability of Precambrian continental lithosphere depends on the rheology of the lithospheric mantle as well as the coupling between crust and mantle lithosphere, which may be inferred by seismic anisotropy. Anisotropy has never been detected in cratonic crust. Anisotropy in southern Africa, detected by the seismological SKS-splitting method, usually is attributed to the mantle due to asthenospheric flow or frozen-in features of the lithosphere. However, SKS-splitting cannot distinguish between anisotropy in the crust and the mantle. We observe strong seismic anisotropy in the crust of southern African cratons by Receiver Function analysis. Fast axes are uniform within tectonic units and parallel to SKS axes, orogenic strike in the Limpopo and Cape fold belts, and the strike of major dyke swarms. Parallel fast axes in the crust and mantle indicate coupled crust-mantle evolution for more than 2 billion years with implications for strong rheology of the lithosphere.

Region of Birth and Child Mortality among Black Migrants to South Africa: Is there a foreign-born advantage?

2016 ◽  
Vol 13 (3) ◽  
pp. 359-376 ◽  
Author(s):  
Tiffany L Green ◽  
Amos C Peters
Keyword(s):  
South Africa ◽  
South African ◽  
Child Mortality ◽  
Southern Africa ◽  
Strong Relationship ◽  
Developed Countries ◽  
Black Immigrants ◽  
Foreign Born ◽  
Region Of Origin ◽  
Child Deaths

Much of the existing evidence for the healthy immigrant advantage comes from developed countries. We investigate whether an immigrant health advantage exists in South Africa, an important emerging economy.  Using the 2001 South African Census, this study examines differences in child mortality between native-born South African and immigrant blacks.  We find that accounting for region of origin is critical: immigrants from southern Africa are more likely to experience higher lifetime child mortality compared to the native-born population.  Further, immigrants from outside of southern Africa are less likely than both groups to experience child deaths.  Finally, in contrast to patterns observed in developed countries, we detect a strong relationship between schooling and child mortality among black immigrants.

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