SYN-RIFT FLUVIO-LACUSTRINE DEPOSITIONAL SYSTEM OF THE CRETACEOUS BIMA FORMATION IN THE GONGOLA SUB – BASIN, NORTHERN BENUE TROUGH, NE, NIGERIA

Shettima Bukar; Mohammed Bukar; Fatima Dupe Adams

doi:10.29121/granthaalayah.v8.i9.2020.1327

Authors

Shettima Bukar Department of Geology, University of Maiduguri, Nigeria
Mohammed Bukar Department of Geology, University of Maiduguri, Nigeria https://orcid.org/0000-0003-0517-239X
Fatima Dupe Adams Department of Geology, University of Maiduguri, Nigeria

DOI:

https://doi.org/10.29121/granthaalayah.v8.i9.2020.1327

Keywords:

Syn-Rift, Fluvio-Lacustrine, Depositional System, Basin

Abstract [English]

The facies analysis of the syn-rift sequences Bima I Formation in the Gongola Sub-basin of the Northern Benue Trough displayed assemblages of trough crossbedded sandstones facies, planar crossbedded sandstone facies, massive bedded sandstone facies, ripple laminated sandstone facies, parallel bedded sandstone facies and mudstones facies. These arrays of facies form two suites of facies association that consist of the lacustrine-delta complex depicting coarsening upward cycles and fluvial complexes showcasing fining upwards cycle the former accounts for a scenario where the incremental accommodation is lower than the sediment discharge, whereas the latter is reflective of a case where improved subsidence rate induces high accommodation rate that outruns sediment supply. The stratigraphic architecture of the syn-rift Bima I Formation indicated that the lacustrine-delta are restricted to the lower stratigraphic horizons whereas the fluvial complexes essentially defines the upper stratigraphic zones of this formation.

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