Accretionary Wedge: Inselbergs of NigeriaFebruary 17, 2009 at 09:11 | Posted in accretionary wedge, geology, Granite, Inselberg's, nigeosyncline, Nigeria | 9 Comments
What are the places and events that you think should all geologists should see and experience before they die? What are the places you know and love that best exemplify geological principles and processes?
Since I’m a new in the geoblogosphere I figured that I take part.
There are many impressing geological features in Nigeria though the general awareness of these features by the general public leaves much to be desired. of these feature one of the most prominent and indeed awesome are the Granite inselbergs.Granite inselergs can be found in the areas of the basement complex which covers more than two-thirds of the country. Here are some of the most popular ones
Zuma Rock, Abuja, central Nigeria
The most famous (Nigeria’s Ayer’s) and one of the largest at more than 1km across.
Idanre hills, Akure South west Nigeria
Another famous one which has made the small town in the foreground a tourist destination.
Kwantankwashi hill, Zamfara North Central Nigeria
Wase rock, wase North east nigeria
Kajuru ludo hill, Kaduna Nigeria
There are many more even outstanding examples in other parts of the country and is something that one cannot miss on any jurney around the nigeria.
The granite inselbergs are huge plutonic intrusions that were emplaced during the pan-african orogenic event which affected all of what is now Nigeria, most of africa and even the arabian peninsular and brazil (sugar loaf mountain). Though they were emplaced at depth 550 million years of erosion have brought them to the surface where the stand out due to their greater resistance to erosion than the surrounding migmatites , Gniesses and migmatic Gniesses.They dome shapes are result of exfoliation (a Chemical weathering process that peels away layers of rock).