Pebble morphogenesis of the Cretaceous Conglomerates from the Abeokuta Formation near the Oluwa River, Eastern Dahomey Basin, Southwestern Nigeria

Pebbles taken from the bed of the Cretaceous Abeokuta Formation paraconglomerate near the Oluwa River were used to infer the depositional setting and the nature of the source area, through the integration of bivariate and ternary (sphericity-form and Zingg diagrams) analyses. Deposition in a river e...

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Bibliographic Details
Published in:Rudarsko-geološko-naftni zbornik 2021-01, Vol.36 (5), p.93-104
Main Authors: Oluwajana, Oladotun Afolabi, Ugwueze, Charles Ugwu, Ogbe, Ovie Benjamin, Egunjobi, Kehinde Joseph
Format: Article
Language:English
Subjects:
Abeokuta Formation
Bivariate analysis
Clay
Conglomerates
Cretaceous
depositional processes
Earth science
Elongation
Engineering
Geology
Heterogeneity
Morphogenesis
Nigeria
paraconglomerate
pebble morphometry
Petroleum engineering
Rivers
Stone
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Summary:Pebbles taken from the bed of the Cretaceous Abeokuta Formation paraconglomerate near the Oluwa River were used to infer the depositional setting and the nature of the source area, through the integration of bivariate and ternary (sphericity-form and Zingg diagrams) analyses. Deposition in a river environment is indicated by the high sphericity values, ranging from 0.59 to 0.88 (average 0.70). Also, bivariate plots of the maximum projection sphericity (ψp) vs. oblate-prolate index (OPI) and flatness index (FI) vs. maximum projection sphericity (ψp) point to the domination of fluvial processes. Dominantly elongated, compact elongated, compact and compact-bladed pebbles are typical for sedimentary regime with prevalence of fluvial over beach processes. Co-existence of various pebbles shapes (mainly disc, rod-, and sphere-shaped), despite of the similar, predominantly quartz composition, may occur due to the different clast fabrics. This heterogeneity also indicates various transport distances and water energies, pointing to the multiple source areas.
ISSN:1849-0409
0353-4529
1849-0409
DOI:10.17794/rgn.2021.5.9