Geochemical characterisation of Fika Formation in the Chad (Bornu) Basin, northeastern Nigeria_ Implications for depositional environment and tectonic setting.pdf

Applied Geochemistry 43 (2014) 1–12
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Applied Geochemistry
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Geochemical characterisation of Fika Formation in the Chad (Bornu)
Basin, northeastern Nigeria: Implications for depositional environment
and tectonic setting
⇑
Adebanji Kayode Adegoke a,b, , Wan Hasiah Abdullah a, Mohammed Hail Hakimi c,
Babangida M. Sarki Yandoka a,d
a Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia
b Department of Geology, Ekiti State University, . 5363, Ado-Ekiti, Nigeria
c Geology Department, Faculty of Applied Science, Taiz University, 6803 Taiz, Yemen
d National Centre for Petroleum Research and Development, ., Bauchi, Nigeria
article info abstract
Article history: Late Cretaceous shales of the Fika Formation in the Chad (Bornu) Basin, northeastern Nigeria, were ana-
Received 7 November 2013 lysed to define paleoenvironment and source of anic matter, and their relation to tectonic setting.
Accepted 24 January 2014 anic carbon and sulphur contents of Fika shale samples are in the range of – and
Available online 1 February 2014
– wt.%, respectively, pointing that these shales were deposited in suboxic-anoxic marine conditions.
Editorial handling by M. Kersten
The biomarker and positions provide evidence for a major contribution of aquatic algae and
anisms with minor anic matter input. Moderate salinity stratification and rela-
tively anoxic-suboxic bottom water conditions are also likely in the Fika shales. Therefore, stratified
water column with moderate salinity and relatively anoxic-suboxic bottom water conditions have con-
tributed anic matter (OM) preservation in the Fika shale layer. Fika shale samples are rich in
SiO2 ( wt.%), followed by Al2O3 ( wt.%) and Fe2O3 ( wt.%). Compared with average shale,
the analysed shale samples are obviously enriched in Al2O3 ( wt.%), TiO2 ( wt.%), and P2O5
(