Late Proterozoic to Early Palaeozoic supracrustal succession of Sierra Leone: an aulacogen at the western margin of the West African Craton

1988 ◽  
Vol 77 (2) ◽  
pp. 429-437 ◽  
Author(s):  
A. C. Umeji
Keyword(s):  
Sierra Leone ◽  
West African ◽  
The West ◽  
West African Craton ◽  
Western Margin ◽  
Late Proterozoic ◽  
Early Palaeozoic

The magmatic evolution at the Moroccan outboard of the West African craton between the Late Neoproterozoic and the Early Palaeozoic

2008 ◽  
Vol 297 (1) ◽  
pp. 329-343 ◽  
Author(s):  
H. Ezzouhairi ◽  
M. L. Ribeiro ◽  
N. Ait Ayad ◽  
M. E. Moreira ◽  
A. Charif ◽  
...  
Keyword(s):  
West African ◽  
Magmatic Evolution ◽  
The West ◽  
West African Craton ◽  
Late Neoproterozoic ◽  
Early Palaeozoic

Where are the Eburnian–Transamazonian collisional belts?

1990 ◽  
Vol 27 (10) ◽  
pp. 1382-1393 ◽  
Author(s):  
Jean Michel Bertrand ◽  
Emmanuel Ferraz Jardim de Sá
Keyword(s):  
West African ◽  
High Grade ◽  
The West ◽  
West African Craton ◽  
Early Proterozoic ◽  
Late Proterozoic ◽  
Nappe Tectonics ◽  
Pan African ◽  
Orogenic Belts ◽  
Lower Crustal

The reconstruction of Early Proterozoic crustal evolution and geodynamic environments, in Africa and South America, is incomplete if cratonic areas alone are studied. If the presence of high-grade gneisses is considered as a first clue to past collisional behaviour, 2 Ga high-grade gneisses are more abundant within the Pan-African–Brasiliano mobile belts than in the intervening pre-Late Proterozoic cratons. The West African craton and the Guiana–Amazonia craton consist of relatively small Archaean nuclei and widespread low- to medium-grade volcanic and volcanoclastic formations intruded by Early Proterozoic granites. By contrast, 2 Ga granulitic assemblages and (or) nappes and syntectonic granites are known in several areas within the Pan-African–Brasiliano belts of Hoggar–Iforas–Air, Nigeria, Cameroon, and northeast Brazil. Nappe tectonics have been also described in the Congo–Chaillu craton, and Early Proterozoic reworking of older granulites may have occurred in the São Francisco craton. The location of the Pan-African–Brasiliano orogenic belts is probably controlled by preexisting major structures inherited from the Early Proterozoic. High-grade, lower crustal assemblages 2 Ga old have been uplifted or overthrust and now form polycyclic domains in these younger orogenic belts, though rarely in the cratons themselves. The Congo–Chaillu and perhaps the São Francisco craton are exceptional in showing controversial evidence of collisional Eburnian–Transamazonian assemblages undisturbed during Late Proterozoic time.

Heat flow data from the western margin of the West African craton (Mauritania)

1991 ◽  
Vol 66 (3-4) ◽  
pp. 320-329 ◽  
Author(s):  
A. Lesquer ◽  
J.C. Villeneuve ◽  
G. Bronner
Keyword(s):  
Heat Flow ◽  
West African ◽  
Flow Data ◽  
The West ◽  
West African Craton ◽  
Western Margin

The Phanerozoic cover sequences preserved as xenoliths in the kimberlite of eastern Sierra Leone

1983 ◽  
Vol 120 (1) ◽  
pp. 67-71 ◽  
Author(s):  
F. H. Hubbard
Keyword(s):  
Sierra Leone ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
West African ◽  
The West ◽  
West African Craton ◽  
Marine Transgression ◽  
Surface Rock ◽  
Lower Palaeozoic ◽  
Magmatic Event

SummarySedimentary and volcanic rocks, now unrepresented in surface exposure, occur as xenoliths in the kimberlite of the Koidu District of eastern Sierra Leone. The sedimentary rocks prove, on micropalaeontological evidence, to have Lower Palaeozoic stratigraphic age. An eastern extension of the Ordovician/Silurian marine transgression on to the Leo Uplift of the West African Craton of some 200 km is indicated. The volcanic rocks may belong to the same cycle of surface rock generation or relate to the younger, widespread, Triassic magmatic event.

Development and Operation of Ebola Diagnostic Laboratories Led By Public Health England in Sierra Leone during the West African Ebola Outbreak 2013-2015

2016 ◽  
Vol 1 (4) ◽  
Author(s):  
Daniel Bailey ◽  
Jane Shallcross ◽  
Christopher H. Logue ◽  
Simon A. Weller ◽  
Liz Evans ◽  
...  
Keyword(s):  
Public Health ◽  
Sierra Leone ◽  
West African ◽  
The West

Structure, evolution and palaeogeography of the West African craton and bordering belts during the Neoproterozoic

1994 ◽  
Vol 69 (1-4) ◽  
pp. 307-326 ◽  
Author(s):  
M. Villeneuve ◽  
J.J. Cornée
Keyword(s):  
West African ◽  
Structure Evolution ◽  
The West ◽  
West African Craton
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