From Wikipedia, the free encyclopedia
Geologic map of the Tarkwa gold district in Ghana showing significant folding and faulting

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 CoastMaliBurkina FasoGhanaSierra LeoneLiberia, 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,  manganesephosphate, 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

  1. ^ 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.  doi: 10.1016/j.jafrearsci.2015.10.008
  2. ^ Ennih N. & Liégeois J-P. (2008). The Boundaries of the West African Craton. Geological Society, London, Special Publications. 297: 1–17.  doi: 10.1144/SP297.1
  3. ^ 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. doi: 10.1038/ngeo1321
  4. ^ 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

External links


From Wikipedia, the free encyclopedia
Geologic map of the Tarkwa gold district in Ghana showing significant folding and faulting

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 CoastMaliBurkina FasoGhanaSierra LeoneLiberia, 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,  manganesephosphate, 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

  1. ^ 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.  doi: 10.1016/j.jafrearsci.2015.10.008
  2. ^ Ennih N. & Liégeois J-P. (2008). The Boundaries of the West African Craton. Geological Society, London, Special Publications. 297: 1–17.  doi: 10.1144/SP297.1
  3. ^ 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. doi: 10.1038/ngeo1321
  4. ^ 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

External links



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