Accretionary Wedge: Back in time

July 19, 2009 at 21:01 | Posted in accretionary wedge, geologic time, geology, nigeosyncline, Nigeria, Uncategorized | 3 Comments

The June edition of the Acrretionary Wedge geoblogospheric carnival was hosted at outside the interzone. I’m obvious late as usual but the topic was too intriguing to so here i am with a one month late. the intruiging post is

“Where and when would you most like to visit to witness and analyze an event in Earth’s history”

Actually if I had a time machine I would go through the whole of geologic time on the spot where I’m on (Nigeria) to see how the land I live on has changed through time. But to narrow down I’ll go for the cretaceous when the Benue trough was evolving. there are still a few important questions to be answered:

  • Is the Benue rift a failed arm of an R-R-R triple junction formed at the early stages of the opening of the Atlantic (similar to the red sea-afar triangle) or is as a result of transcurrent movement along the chain and chacourt transform faults?
  • How extensive were the various trangressions in the area? Did all transcontinental connections between the Tetys and the Atlantic exist?
  • What caused the Santonian compression and it’s accompanying magmatism?

I’d also like to see the sedimentary environments where the formations of the Benue rift and the adjacent Anambra basin. And many more things.

The images are from here>

Where I'm talking about, 120 million years ago

Where I'm talking about, 120 million years ago

Where I'm talking about, 105 million years ago

Where I'm talking about, 105 million years ago

Where I'm talking about, 120 million years ago

Where I'm talking about, 120 million years ago

Where I'm talking about, 65 million years ago

Where I'm talking about, 65 million years ago

I’d also like to see Nigeria during the Pan- African orogeny (650-500 million years ago) to see how it happened and how those intrusions which stand out as the inselbergs I blog about earlier formed.

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).

The Very First

February 4, 2009 at 14:06 | Posted in nigeosyncline | 3 Comments

You’ll never get a second chance to make a first impression.

This is the first of many posts in what I think is the first blog on geology from a Nigerian perspective. Though of course issues from other fields will find their way into this blog from time to time (not too frequently I hope).

Why start a blog in the first place?

For some, it starts with a desire to be present on the internet. “To type your name on Google and a result comes out”. I had that desire at one time or the other. I think I heard the word blog for the first time in 2005 in my 2nd undergraduate year. I started considering starting one after the suggestion of a friend. What would I blog about? I was, to begin with, sceptical about the need for another blog on geology. On Nigerian geology? I had not and still have not come across one on that topic. “Then start one!” My friend suggested. “Your other Friend started a blog on Contemporary Nigerian Art.” He added. I promised to give it a thought.

As I am at the beginning of a career as a geologist (hopefully) in the academia, Nigeosyncline would actually be a sort of chronicle of my attempts to grapple with the challenges which face geologists in Nigeria. It won’t be presumptuous to say many young Nigerian geologists would be able to identify with some of the things here.

Now the blog is here and I hope as time goes by I’ll be putting a lot more on this blog. l am getting around to understanding my dashboard so there may be frequent changes to look appearance of the blog until I get a firm hand on the blogging business.

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