Paleocurrent, petrography and provenance analyses of the Ajali Sandstone (Upper Cretaceous), southeastern Benue Trough, Nigeria

Assessment of the Implications of Geotechnical Properties of Soils in Otukpa Area of Ogbadibo LGA, Benue State, Nigeria

“…The major sedimentary structure in the area is the planar and tabular cross stratification [9]. Reference [10] presented that Ajali formation documents a spectrum of depositional environment ranging from continental through marginal marine to shallow marine. Palaeogeography and palaeocurrent trends established on the basis of grain size distribution pattern, field relation of the sandstones and palaeocurrent analysis in the study area showed that there were ancient rivers which were responsible for the transportation of clastic sediments from their parent pre-Santonian igneous and metamorphic rocks of the Nigerian Basement Complex and Oban Massif.…”

Lithofacies, palynofacies, and sequence stratigraphy of Palaeogene strata in Southeastern Nigeria

“…Before the Santonian deformation, the Anambra Basin was a stable platform, thinly covered by sediments. The formation of the anticlinorium dislocated the depositional axis from the Benue Trough to the Anambra Platform (Murat, 1972;Hoque and Nwajide, 1985;Amajor, 1987). As sediment accumulated on the platform, it gradually subsided asymmetrically and Cretaceous deltaic systems of the palaeo-Benue River prograded toward the southwest (Obi et al, 2001).…”

Paleoenvironment and Provenance Studies of Ajali Sandstone in Igbere Area, Afikpo Basin, Nigeria

“…Thecross-beds include trough, planar, climbing rippled crossbeds and herring bone crossstratifiedunits according to Amajor (1986). The section commonly ranges from 0.7-5.0m thick while the cross -strata are between 2 and 10 cm thick.…”

“…Alater deposit, the super-adjacent Awgu Formation, is composed of lower limestone shaleand upper feldspathic and glauconitic sandstone (Agumanu, 2011 Arua, 1990). On the bases of paleocurrentstudies, mineralogical analysis and provenance decision, the formation was consideredto have been derived from the Post-Santonian Abakaliki Anticlinorium (Nwachukwu,1972;Murat, 1972;Amajor, 1987). Different workers had adduced differentpaleoenvironmental settings for the sandstone on the basis of sedimentological analysisnamely, fluvial (Murat, 1972); fluvio-deltaic (Reyment, 1965;Hoque and Ezepue, 1977)and fluvio-marine (Amajor, 1987).…”

“…On the bases of paleocurrentstudies, mineralogical analysis and provenance decision, the formation was consideredto have been derived from the Post-Santonian Abakaliki Anticlinorium (Nwachukwu,1972;Murat, 1972;Amajor, 1987). Different workers had adduced differentpaleoenvironmental settings for the sandstone on the basis of sedimentological analysisnamely, fluvial (Murat, 1972); fluvio-deltaic (Reyment, 1965;Hoque and Ezepue, 1977)and fluvio-marine (Amajor, 1987). The present study synthesizes data from lithofacies, sedimentary structures andpetrology and paleocurrent trend to infer the paleoenvironment, source model andpaleogeography of sediments in Igbere area.…”