Evolution of the Nigerian Basement Complex: Current Status and Suggestions for Future Research

Publication Date : 01/06/2022

Author(s) :

Ominigbo, O.E.

Volume/Issue :
Volume 58
Issue 1
(06 - 2022)

Abstract :

The polycyclic basement rocks of Nigeria have been the subject ofseveral isolated and localstudies. Despite the huge amount of studies on the basement however, the geodynamic evolution of the basement remains a subject of debate. This study highlights some of the major existing studies on the basement complex with a view to streamlining the existing knowledge into a coherent perspective as well as identifying potential areas for future research that will improve our understanding of the evolution of the Nigerian Basement Complex (NBC). The polyclicity of the basement poses a major challenge in deciphering episodicity of the events leading to the geodynamic evolution of the region. The reported occurrences of pre-Pan-African rocks in some parts of the basement are interpreted as reflecting the relicts of reworked older crustal materials which cannot be regarded as juvenile earth materials. Thus, such Eburnean orsimilar older ages cannot be inferred to represent the primary isotopic age of magmatism and other associated thermo-tectonic events within the basement. Lack of integrated, comprehensive structural and isotopic data is identified as part of the missing links resulting in the present poor understanding of the complex. Integrated, regional geoscientific studies employing modern techniques and tools are needed to fully understand the geodynamic evolution of the Nigerian basement rocks. To do this, quantitative models, structural analyses and modern geochronological dating techniques are recommended. It is also recommended that mineral exploration should be intensified within the Older Granites as this will not only enhance the understanding of the mineralization potentials ofthese rocks but also provide clearerinsightsinto the general evolution ofthe basement complex.

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