Depositional Environment and Paleo-redox Indicator of the Maastrichian-Campanian Clay in Central Bida Basin, NW Nigeria: Insight from Geochemistry and Sedimentology

ALABI Adekola Amos^1, , GARBA Ibrahim², DANBATTA Umar Adamu² and NAJIME Tavershima²

¹Department of Geology, School of Mining and Geology, University of Rwanda Kigali

²Department of Geology, Ahmadu Bello University Zaria, Nigeria

Cite this paper:
ALABI Adekola Amos, GARBA Ibrahim, DANBATTA Umar Adamu and NAJIME Tavershima. Depositional Environment and Paleo-redox Indicator of the Maastrichian-Campanian Clay in Central Bida Basin, NW Nigeria: Insight from Geochemistry and Sedimentology. Journal of Geosciences and Geomatics. 2018; 6(3):147-152. doi: 10.12691/jgg-6-3-5

Abstract

Bida basin is one of the younger sedimentary basins of Africa (Campanian – Maastrichitian) in Nigeria regarded as the northwestern extension of Anambra basin bounded by monotonous Precambrian basement rocks. Marine incursion in to the basin was suspected to have taken place during the early part of the uppermost Maastrichtian phase from the south via the Anambra basin, during which very extensive Sandstones and thick Kaolinite beds of the Patti Formation in the southern Bida basin were deposited. Stratigraphically, Bida basin is divided into the southern and northern parts. A topographic base map on a scale of 1:200,000 was generated for the study. Geochemical characterizations of thirty clay samples were analyzed for major, minor and trace elements. Field mapping revealed seven clay occurrences on isolated hills, floodplain and plain. Clays in the basin have high light REE/heavy REE ratio, negative Eu anomaly and Plot of Cr versus V suggest felsic source rocks. U/Th, V/Cr ratios and authigenic uranium values of the clays suggest an oxic environment of deposition in flood plain, alluvial fan and braided channel at the upper Maastrichian age that represent Upper cretaceous period.

Keywords:
Bida basin Basement rocks Clay Maastrichian Campanian Marine incursion

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