| Autor: |
Aigbadon, Godwin Okumagbe, Igwe, Ezekiel Obinna, Ocheli, Azuka, Overare, Brume, Akakuru, Obinna Chigoziem, Akudo, Ernest Orji, Obasi, Ikenna Arisi, Bala II, Jamilu Ahmed, Aminu, Mu'awiya Baba |
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| Zdroj: |
Arabian Journal of Geosciences; May2023, Vol. 16 Issue 5, p1-22, 22p |
| Abstrakt: |
Sedimentary facies, petrography, paleocurrent data and palynological biofacies were employed to determine the paleoenvironments, stratigraphy and paleogeographic setting of sediments in the southern Bida Basin, Nigeria. Two components of Upper Cretaceous lithostratigraphic units were identified: the Lokoja Formation (Campanian) and Patti Formation (Maastrichtian). Results of the sedimentary facies analysis revealed seven lithofacies grouped into subtidal/foreshore, estuarine mudflat and central estuarine delta facies associations. The lithofacies show estuarine tidal channels, central estuarine and littoral foreshore-upper shoreface settings. The palynological investigation revealed the lack or little abundance of the dinoflagellates and abundance of sporomorphs in mudstone and shale facies of the Lokoja and Patti Formations respectively. The mudstones and greyish shale facies of the Patti Formation marked a late Campanian marine transgression that extended into the Mid-Maastrichtian in the Patti Formation. Petrofacies analysis identifies the sandstones as feldspathic and arkosic arenites. The paleocurrents for the cross-stratified sandstones indicate southwest and northwest flowing fluvial/tidal systems. The sediment sources are near, probably from the Benue Trough, north-central and southwest Basement Complex rocks of Nigeria, respectively. A new understanding of the sources of sediment inputs and flux into the basin as well as the contemporary palaeogeographical setting of the southern Bida Basin has been gained through the integration of sedimentary facies, petrography, palynomorphs, and paleocurrent data in the study sections of the Agbaja axis. The direction of palaeocurrent flow for the subtidal sandstone facies of the Lokoja and Patti Formation in the Agbaja Plateau/Agbaja-Ahatu-Ibaru axis of the basin has thus been determined by these new findings to be a north-western and southwestern distributary pattern in a mixed depositional setting. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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