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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Togo-Benin-Nigeria Shield: evidence of crustal aggregation in the Pan-African belt
Tectonophysics, Volume 165, No. 1-4, Year 1989
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Description
The importance of "suspect" or "exotic" (i.e. allochthonous) terranes as a major element in collisional orogenic belts is becoming well established. We propose that the southern Pan-African domain in West Africa is an aggregation or " mosaic" of island arcs, interarc (ensimatic) basins and continental fragments. A fracture zone in northwestern Nigeria, already identified as a possible crustal suture, is shown to separate two contrasted basement terranes. Elsewhere in the shield are flat-lying structures characteristic of those associated with crustal convergence, lying within or near to major fractures. Many small ultramafic/mafic bodies occur in the shield and some of them may be remnants of ophiolites caught up in suture zones. An aggregation of allochthonous terranes (island arcs, sedimentary basins and continental blocks) would help to explain: 1. (a) the great width of the Pan-African belt; 2. (b) the spread of ages within the "Pan-African" range (c. 750-450 Ma), also the relict Liberian and Eburnian ages (c. 2700 and 2000 Ma respectively); and the enigmatic Kibaran "event" (c. 1100 Ma); 3. (c) the contrasted volcano-sedimentary characteristics of the different supracrustal belts. © 1989.
Authors & Co-Authors
Ajibade, A. C.
Nigeria, Owerri
Federal University of Technology
Wright, John B.
United Kingdom, Milton Keynes
The Open University
Statistics
Citations: 92
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1016/0040-1951(89)90041-3
ISSN:
00401951
Research Areas
Violence And Injury
Study Locations
Multi-countries
Benin
Nigeria
Togo