Geochemical Trends in Weathering Profiles and Their Underlying Precambrian Basement Rocks in Akure, Southwestern Nigeria

 


Keywords:

Akure

Nigeria

Geochemical trends

In-situ weathering profile

Kaolinitic


ABSTRACT

Akure area in southwestern Nigeria falls within the basement complex 

underlain by migmatite, quartzite granite and charnockite. Geochemical 

features of these crystalline rocks and their overlying in-situ weathering 

profiles are investigated and reported. Analytical result from ICP-MS 

facility at the University of Malaya reveals average SiO2 content in 

quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite 

(58.6%) categorize the rocks as siliceous. SiO2 contents in the weathering 

profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6% 

respectively. Alumina contents in the weathering profiles overlying 

quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite 

(24.3%) are substantially higher than the precursor rocks. In the same 

order, average alkali (Na2O+K2O) contents in the profiles are 3.38%, 3.42%, 

3.48% and 2.68%. Chemical features of the profiles reflect that there exists 

some correlation between the chemistry of crystalline basement and their 

in-situ weathering profiles. The residual soils contain low plastic clays with 

kaolinitic characteristics and compare well with other clays reported from 

other parts of Nigeria basement complex. 


Conclusions

From the study, the following conclusions are made. 

The weathering profiles are formed in-situ and vary in col-

our, texture, and thickness. The composition is siliceous 

and there exist some correlations between the chemistries 

of weathering profile and their underlying crystalline 

basement rocks. The geochemical features of the profiles 

portray high alumina and alkali contents but with slight 

variations that are related to the parent rock chemistry. 

Field investigation shows the weathering profiles have 

characteristic features comparable to kaolinitic and low 

plastic clays and are like other industrial clay deposits in 

southern Nigeria.


From Journal of Environmental & Earth Sciences


which has been indexed by 

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