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

Oluwajana, Oladotun Afolabi; Ugwueze, Charles Ugwu; Ogbe, Ovie B.; Egunjobi, Kehinde Joseph

doi:10.17794/rgn.2021.5.9

Cited by 1 publication

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7C, D). This highlights that a larger proportion of the studied pebbles have low sphericity, which suggests that most of them were transported relatively far from their source area or in the beach zone (Bluck, 1967;Widera, 2010;Oluwajana et al, 2021). The wide distribution of pebble shapes is suggestive of multiple provenances of the sediments (Brush, 1961;Sremac et al, 2018;Barudžija et al, 2020;Oluwajana et al, 2021).…”

Section: Depositional Processes and Provenancementioning

confidence: 85%

“…This highlights that a larger proportion of the studied pebbles have low sphericity, which suggests that most of them were transported relatively far from their source area or in the beach zone (Bluck, 1967;Widera, 2010;Oluwajana et al, 2021). The wide distribution of pebble shapes is suggestive of multiple provenances of the sediments (Brush, 1961;Sremac et al, 2018;Barudžija et al, 2020;Oluwajana et al, 2021). The sediments of the Ogwashi Formation may have been redeposited and reworked by wave and tidal actions, as reflected in mixtures of various pebble sizes (Abdulkadir & Abdullatif, 2013;Ogbe & Osokpor, 2021).…”

Section: Depositional Processes and Provenancementioning

confidence: 89%

“…The size and shape of clastic sediments have been related to the processes of transport and deposition. It has been shown and proved that pebble morphometric parameters may be helpful, as additional indicators, in deciphering the processes of transport and depositional environment (e.g., Sneed & Folk, 1958;Lutig, 1962;Sames, 1966;Dobkins & Folk, 1970;Stratten, 1974;Gale, 1990Gale, , 2021Widera, 2010;Okoro et al, 2012;Odumodu & Israel, 2014;Ocheli et al, 2018;Madi & Ndlazi, 2020;Oluwajana et al, 2021).…”

Section: Pebble Morphogenesis For Interpretation Of Depositional Sett...mentioning

confidence: 99%

“…Pebble morphometric analysis is a sedimentological approach that has been successfully applied by several workers for deciphering the palaeoenvironments and depositional settings of similar formations and basins in Nigeria and other parts of the world (e.g., Sames, 1966;Hubert, 1968;Dobkins & Folk, 1970;Nwajide & Hoque, 1982;Gale, 1990Gale, , 2021Olugbenro & Nwajide, 1997;Ogala et al, 2010;Widera, 2010;Okoro et al, 2012; A -A simplified regional geological surface map of the Niger Delta Basin showing the location of the studied outcrop (marked as a red star) in the northern delta area (reprinted from Ogbe, 2021); B -A schematic NE-SW cross-section through the Niger Delta Basin in south-eastern Nigeria (reprinted from Ogbe, 2021;Ogbe & Osokpor, 2021); note the position of the vertical line AB depicting stratigraphical successions in the Niger Delta Basin; for a detailed stratigraphy see Figure 2. Nton & Adamolekun, 2016;Ocheli et al, 2018;Madi & Ndlazi, 2020;Oluwajana et al, 2021). Similarly, Odumodu and Israel (2014) and Onyemesili and Odumodu (2019) used this sedimentological approach with eroded pebbles in the interpretation of the Ogwashi Formation and concluded that the sediments of this unit formed in a fluvial environment.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Morphometric analysis of pebbles in verification of transport processes and interpretation of palaeoenvironment: A case study from the Ogwashi Formation (Oligocene), Niger Delta Basin, Nigeria

Ogbe,

Osokpor,

Emelue

et al. 2023

logos

View full text Add to dashboard Cite

The present paper discusses a palaeoenvironmental interpretation of the Oligocene Ogwashi Formation (Niger Delta Basin, Nigeria) through morphometric analysis of pebbles, a research method essentially depending on the quantitative evaluation of pebble size and shape which change during transport processes in a range of depositional environments. The relationship of bivariate and ternary-diagram plots of independent functions was determined from freshly exposed sandstone sections in quarries at Ibusa, near Asaba, Nigeria. The grain size of pebbles ranges from fine (11.00 mm) to very coarse (41.33 mm), with a mean size of 21.05 mm (coarse pebbles). A bivariate plot of the flatness index vs maximum projection sphericity index shows 37% of the pebbles to fall within a beach (marine) environment, and 33% within a fluvial environment; the remaining 30% are uncertain. The maximum projection sphericity index vs oblate-prolate index bivariate plot indicates that 47% of pebbles fall within a marine environment and 22% within a fluvial environment, while the remaining 31% are uncertain. The sphericity-form ternary diagram plot shows that the pebbles primarily comprise bladed, platy, very bladed and very platy of near-equal proportions with minor elongate and very elongate stones, which suggests that the pebbles are diverse in origin. The sphericity-form bivariate plot indicates that the pebbles are largely of disc and blade shapes with a minor number of spherical and rod shapes. The near-equal proportion of pebbles in different segments of the bivariate and ternary diagram plots, and the wide distribution of the pebble grain sizes and shapes suggest the Ogwashi Formation is composed of redeposited sediments that likely were transported and deposited in a mix of marine and fluvial settings with possible transitional environments. In other words, the pebbles can be interpreted as marine-influenced fluvial sediments in marginal-marine settings.

show abstract