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2014 (Vol. 6, Issue: 1)
Article Information:

Sedimentological Characteristics and Geochemistry of Ajali Sandstone Exposed at Ofe-Jiji and Environs, Northern Anambra Basin, Nigeria

Y.B. Gideon, F.B. Fatoye and J.I. Omada
Corresponding Author:  Y.B. Gideon 

Key words:  Fe-rich, fluvial origin, lithic arenite, Ofe-jiji, sandstone characteristics, ,
Vol. 6 , (1): 10-17
Submitted Accepted Published
July 26, 2013 August 16, 2013 January 20, 2014
Abstract:

Textural, mineralogical and structural studies as well as outcrop mapping of sandstone in Ofe-Jiji and environs were carried out in order to interpret depositional environment of Ajali sandstone exposed at Ofe-Jiji and environs of the northern Anambra Basin. The sandstone is false bedded, medium-coarse grained (average of 1.13 mm in diameter), poorly sorted and strongly coarsely skewed with an average skewness value of -0.72. Chemical analysis indicates that the sandstone exhibits average SiO2 contents ranging from 59.12 to 60.20% with an average value of 59.80% while alumina (Al2O3) content range between 2.51 and 2.75% with an average of 2.63%. The mineralogical composition shows on the average 56.98 quartz, 6.30 feldspar, 31.78% rock fragment and 4.93% matrix and cement. The major framework composition is Q56 F6 L36 which classifies the sandstone as lithic arenite. The sub angular texture and the geochemical assay of 22.74 ratios (SiO2/Al2O3) and 3.36 ratios (Na2O/K2O) indicate low chemically stable minerals in the sandstone and depict mineralogical immaturity. Also, the average ZTR% index of 52.36% with Tourmaline as the least abundant of ultra-stable minerals indicates sub-mature to immature mineralogy of the sandstone. The sandstone may be described as Fe-Sandstone based on Herron Classification Scheme. The dominance of Fe2O3 (26.57%) in the sandstone renders it ferruginous and reflects oxidizing environment. Ophiomorpha burrow in the upper unit of the beds strongly suggests fluvial origin.
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  Cite this Reference:
Y.B. Gideon, F.B. Fatoye and J.I. Omada, 2014. Sedimentological Characteristics and Geochemistry of Ajali Sandstone Exposed at Ofe-Jiji and Environs, Northern Anambra Basin, Nigeria.  Research Journal of Environmental and Earth Sciences, 6(1): 10-17.
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ISSN (Online):  2041-0492
ISSN (Print):   2041-0484
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