Accretionary Wedge: Inselbergs of Nigeria

February 17, 2009 at 09:11 | Posted in accretionary wedge, geology, Granite, Inselberg's, nigeosyncline, Nigeria | 9 Comments

This month’s Accretionary Wedge Geosblogospheric carnival is hosted at Geotripper and the theme:

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

Zuma rock Abuja Central Nigeria. View from the west

Zuma rock Abuja Central Nigeria. View from the west

The most famous (Nigeria’s Ayer’s) and one of the largest at more than 1km across.


Idanre hills, Akure South west Nigeria

Idanre hills (Idanre town in the foreground)

Idanre hills (Idanre town in the foreground)

Another famous one which has made the small town in the foreground a tourist destination.
Kwantankwashi hill, Zamfara North Central Nigeria

kwatankwarshi Inselberg-

kwatankwarshi Inselberg

Wase rock, wase North east nigeria

wase

Wase inselberg

Kajuru ludo hill, Kaduna Nigeria

Kajuru-Ludo hill

Kajuru-Ludo hill

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).

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