... 2 − . The aquifer is situated in the fractured shales of Abakaliki Formation. The dominant ions in most samples are Ca 2+ , Mg 2+ , SO 4 2 − , and Cl − . Furthermore, strong positive correlations exist between EC-TDS, Na + -TDS, Mg 2 + − SO 4 2 + , and Ca 2 + − SO 4 2 + . Piper trilinear diagrams...

... of soaking on the geotechnical properties of Abakaliki and Nkporo shales. Shales of Abakaliki Formation are moderately hard, grey to reddish brown and weather to rusty brown suggesting presence of ferric cement ( Fig. 2 ). White patches suspected to be kaolin mineral, are noticeable in the field samples...

...Mominul Hoque Abstract Textural and petrographic attributes of sandstones of several Cretaceous formations of southern Nigeria sedimentary basin have been evaluated. Sandstones of the first sedimentary cycle (Albian-Santonian) confined mainly to the Abakaliki basin are feldspathic and those...

... in the Abakaliki anticline and the burial diagenesis observed in the adjacent Anambra basin. Implications for petroleum potential in these basins are briefly discussed, based on the maturity data and conclusions from previous source rock evaluation studies of the Cretaceous formations. Twelve shale...

... intensely into the Abakaliki anticlinorium, along the same northeast-southwest axes. This structural inversion of the Abakaliki trough was accompanied by the formation of depressions on either flank, the small Afikpo syncline on the southeast and the much wider Anambra basin on the northwest. The sediments...

...°C 16.8 10.7 2.18 8.5 3.99 Approval granted. There was no conflict of interest among the authors. References Agumanu , A. E. ( 1989 ). The Abakaliki and Ebonyi formations: Subdivisions of the Albian Asu River Group in the southern Benue Trough, Nigeria...

...) was the deposition of the Asu River Group, Eze-Aku and Awgu formations within the core and the marginal areas of the Abakaliki basin which was flanked to the east by the Anambra platform, and to the southwest by the Ikpe platform ( Fig. 2 ). The Awgu Formation consists of grey to dark well-bedded fissile shales...

... in the southern Benue trough. It is about 9,800 ft (3,000 m) thick and consists of basal arkosic sandstones (Awi and Mamfe Formations), middle marine shales (Abakaliki Shale) and karstic limestones, and upper regressive sandstones (Awe Formation) ( Fig. 2 ). The Abakaliki Shale and the Awe Formation represent...

... Contributions to Mineralogy and Petrology 1972 35 277 292 Guiraud, M. 1990. Mécansime de formation du Bassin sur décrochements multiples de le Haute Benoue (Nigeria): Faciés et géometrie des corps sédimentaires, microtectonique et déformation synsédimentaire. Thése Doctorat d'Habilitation...

... and to the east, and a subsiding area, the Abakaliki Basin, which was receiving large amounts of sediment (Asu River Group and Ezeaku Formation) ( Murat, 1972 ; Petters, 1978 ; Benkhelil, 1982 ; Whiteman, 1982 ; Ojoh, 1992 ). The Santonian movement, which was widely accompanied by magmatism ( Maluski et al...

... Geological Society of India Airborne geophysical data Anomalous bodies Magnetic susceptibilities Euler depth estimation Source parameter imaging Forward and inverse modeling Nsukka area Nigeria The major units of the lower Benue trough include the Anambra basin, the Abakaliki...

... by a thick Tertiary delta complex, broadly contemporaneous with the Niger Delta where deep crustal structure is not imaged by seismic data. Benue Trough/Abakaliki foldbelt . This onshore area has significant implications for the geologic evolution of the region. Thick rift section of Aptian-to-Santonian...

... (Asu River Group, 1,680 m, which includes Abakaliki Shale, Arufu Limestone, Uomba Formation, and Gboko Limestone of the lower and middle Benue Valley; Fig. 3 ). In the south, marine Cenomanian beds (Odukpani Formation, 1,000 m) also directly overlie the basal sandstones ( Reyment, 1965 ). The marine...

... is the lack of reliable data on the magnitude of uplift in the Benue trough, although a value of over 6,500 ft (2,000 m) was inferred by Petters and Ekweozor (1982a) for the Abakaliki foldbelt. 1 Manuscript received, August 1,1983; accepted, Augusts, 1984. 2 Geology Department...

... the thermal maturity of shale formations for oil and natural gas generation and flow. Clay minerals (illite, illite smectite mixed layers, and kaolinite) have been identified by X-ray diffraction analysis. Using a CMS grant, Opeyemi will perform scanning electron microscopy (SEM) on the clay fractions...

... of such a study on the Niger Delta basin. Similar studies may prove useful for prospect evaluation in relatively mature exploration areas. The Niger Delta basin is located within the perioceanic section of the Abakaliki-Benue suture zone of the much larger southern Nigerian basin ( Fig. 1A...

... ). The values of CIA from these two formations range from 72.94 to 88.91 (See Table 2a ). As would be expected, the CIA is drastically lowered in samples 15S, 30S and 36S because of their high contents of CaO. Corresponding author: e-mail: [email protected] © 2011 Geological Society of South Africa...

... zones of the Cenozoic of some tropical lands from shell-BP cores and correlated sediments of tropical and sub-tropical countries. Umeji (2002) assigned a late eocene to early Miocene age to the Mpu Formation in the Abakaliki basin, based on sporomorph assemblage from the lignites...

... al (1978) . The Tertiary Niger delta is one of the major regressive deltaic sequences in the world. The delta is over 12,000 m thick and occupies an area of 75,000 km 2 in the Gulf of Guinea ( Figures 1 , 2 ). Development of the proto-Niger delta began with the formation of the Benue-Abakaliki...

... a restricted area (i.e., where the present Cross River flows between the Abakaliki anticlinorium and the Oban massif) and, in this area, are considered to represent the deposits of the incipient Cross River delta. The delta of the Niger River itself first becomes apparent during the time designated as P330...