Man Shield
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The Man Shield (Leo-Man Shield or Leo-Man Craton) is a geological shield or craton in the southeast portion of the West African Craton. The shield is in part overlaid by gold-bearing Birimian formations.
Geography and Geology
The shield covers the countries Ivory Coast, Mali, Burkina Faso, Ghana, Sierra Leone, Liberia, and Guinea.[1] this shield, a large portion of the WAC consists of Paleoproterozoic Birimian continent margins.[2]
The Birimian units were initially produced in an immature volcanic arc setting, which was later metamorphosed during the Eburnean orogeny. The poor exposure of the greenstone belt in the area limits interpretations of a broad structural context. The limited greenstone belt exposure indicates a major deformation event associated with granitoid intrusions.[3] The shield hosts world-class gold deposits, important iron ore concentrations, and the mineralization of aluminum ore, lead-zinc, manganese, phosphate, and uranium. A majority of the gold deposit formations occurred during the Eburnean orogeny, but a number of the remaining gold deposits formed before this orogeny during a period of oceanic arc-back-arc basin formation and erosion during the Neoproterozoic and Cretaceous.[4]
See also
References
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- ↑ Jessell M.W., Liégeois J-P. (2015). "100 years of research on the West African Craton". Journal of African Earth Sciences. 112(B): 377– 381. Script error: No such module "CS1 identifiers".
- ↑ Ennih N. & Liégeois J-P. (2008). The Boundaries of the West African Craton. Geological Society, London, Special Publications. 297: 1–17. Script error: No such module "CS1 identifiers".
- ↑ Ganne J., De Andrade V., Weinberg R.F., Vidal O., Dubacq B., Kagambega N., Naba S., Baratoux L., Jessell M., Allibon J. (2011). "Modern-style plate subduction preserved in the Palaeoproterozoic West African craton". Nature: Geoscience. 5: 60-65.Script error: No such module "CS1 identifiers".
- ↑ Markwitz V., Hein K.A.A., Jessell M.W., Miller J. (2016).M "etallogenic portfolio of the West African craton". Ore Geology Reviews. 78: 558-563. https://doi.org/10.1016/j.oregeorev.2015.10.024
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External links
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