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Abstract
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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
Submitted: July 26, 2013
Accepted: August 16, 2013
Published: January 20, 2014 |
Abstract:
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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.
Key words: Fe-rich, fluvial origin, lithic arenite, Ofe-jiji, sandstone characteristics, ,
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Cite this Reference:
Y.B. Gideon, F.B. Fatoye and J.I. Omada, . Sedimentological Characteristics and Geochemistry of Ajali Sandstone Exposed at Ofe-Jiji and Environs, Northern Anambra Basin, Nigeria. Research Journal of Environmental and Earth Sciences, (1): 10-17.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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