GEOLOGY OF NIGERIA BY KOGBE PDF

The rock types fall into two 2 main groups: 1 The metasediment which consist of 2,3,4,5 above 2 Igneous rocks which comprises the granies, lamprophyre, pegmatite, dolerite, syenite. Joints, lineation and foliation,veins and folds are some of the Structural features found in the study area. The other rocks occur as minor rocks either as veins or dykes and they include pegmatites, lamprophyre, syenite, dolerite. These porphorytic granites are referred to as the Igarra plutons and ranges from pinkish granites colouration to Biotite granites and most common of the older granite rocks in the study area. The granites are elliptical in shapes with megascopic biotite crystals.

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Kajim There was a problem providing the content you requested Billman subdivided the Abeokuta Formation into three lithostratigraphic units: The Bima Sandstone was subdivided by Carter et al.

The Nigerian tar sands constitute important raw materials, like those that are needed by the Kaduna Refinery for the production of some non — conventional petroleum products such as lubricating greases, lubricating oil, waxes, bitumen and asphalt.

The exploration division explores for raw materials, which are sent to the mining division in Itakpe. In general, these granites as well as the koybe are not affected by a penetrative deformation, but undulatory extinction of the quartz and fractures in feldspar crystals indicate local brittle deformation.

Field geology means field work Finki, geology, as practiced by direct observation of outcrops, exposures, landscapes, and drill cores. The interband ing of permeable sandstone and mudstone with kogeb clays in the Gwandu Formation is particular ly favourable for the roll type uranium mineralization Dahlkamp, with the peat bands providing the necessary uranium reductant. These spurs are the Obudu Plateau that stands at a height of over 1 metres above the general level of the land and the Oban Hills with an average elevation of 1 m above sea level.

More recently Rahaman et al. The schist belt rocks are generally considered to be Upper Proterozoic. Many areas in northern, western and eastern Nigeria are covered by rocks of the Migmatite — Gneiss Complex.

Based on the occurrence of uranium deposits in Niger Republic, any uranium mineralization in the Gundumi and Illo Formations should be concentrated within the basal conglomerates and arkoses which are closely associated with unconformities. The shales contain significant amount of organic matter and may be a potential source for the hydrocarbons in the northern part of the Niger Delta Reijers and Nwajide, The lithologic composition of the Asu River Group comprises limestones, shales, micacous siltstones, mudstones and clays Offodile, ; Obaje, The second is that the application of the well-established Anambra Basin names: This is the planting season in the north.

Okosun carefully reviewed the stratigraphy of the Dahomey Basin. It is bounded in many places by granitic and metamorphic rocks of the Basement Complex and members of the Younger Granite suits. Geology of Nigeria Book, [] Besides the above classification, Sobulo reported that Nigerian soils can also be broadly grouped into four major categories for management purposes and these groupings are: The mid-Santonia n was a period of folding throughout the Benue Trough.

They occur as bands and lenses of banded and sometimes massive iron formation dipping between 21O and 85O and mostly conformable to the host rocks gneisses and amphibolities. Generally the delta prograded over the subsidizing continental-oceanic lithospheric transition zone, and during the Oligocene spread onto oceanic crust of the Gulf of Guinea Adesida et al.

However, Obaje reported that coal seams of up to 5m were encountered in the boreholes drilled by the National Steel Raw Materials Exploration Agency. This is the planting season. This zone extends from the coastal inland and runs along the valleys of the Niger and the Benue rivers, thus cutting geologj the vegetational zones. Slightly deformed pegmatite aplites and vein quarz; and 6.

Sediment deposition follows an east-west trend. They are generally high level intrusions and anatexis has played an important role Rahaman, They are essentially hydrocarbon. ASTM D PDF These soils might have been formed from wind-sorted desert sands that accumulated over long periods of time when the Sahara desert encroached several kilometres south of its present limits. The geochemistry of the amphibolite complexes within the schist belts has also led to controversy.

All maps in this write-up was digitized by the bh author and all pictures taken by both authors on field. Geology of Nigeria — C. Kogbe, University of Ife. Center for Advanced Studies — Google Books Pebbles which are sub-angular to rounded are found area the outcrop. The indication is that the reserves could more than double this figure, as investigatio n continues.

Cancel Forgot your password? Higher up stratigraphically at outcrop the shale content of the formation progressively increases. Individual bodies occur as dykes and flat-lying sheets up to 2 km along strike. The formation is very similar in composition to the Nkporo Shale, but as mentioned klgbe, their occurrence in separate basins with different geologic histories and the lack of adequate outcrop sections necessitate a separate nomenclature.

Schist Belts Metasedimentary and Metavolcanic rocks: A study of the best known deposit of barytes at Azara in the Middle Benue Trough shows that the minera l, like the lead-zinc, infills fracture systems, but in generally arenaceous deposits. Such deposits include those occurring in 1 quartz-pebble conglomerates, 2 sandstones, lf caicrete and 4 shales, phosphates and other related sediments.

The lithostratigraphic unit does not occur in outcrops. The siltstones of the Patti Formation are commonly parallel stratified as wave ripples, convolute laminations, load structures. Most 10 Related.

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REGIONAL GEOLOGY OF NIGERIA

Kajim There was a problem providing the content you requested Billman subdivided the Abeokuta Formation into three lithostratigraphic units: The Bima Sandstone was subdivided by Carter et al. The Nigerian tar sands constitute important raw materials, like those that are needed by the Kaduna Refinery for the production of some non — conventional petroleum products such as lubricating greases, lubricating oil, waxes, bitumen and asphalt. The exploration division explores for raw materials, which are sent to the mining division in Itakpe. In general, these granites as well as the koybe are not affected by a penetrative deformation, but undulatory extinction of the quartz and fractures in feldspar crystals indicate local brittle deformation. Field geology means field work Finki, geology, as practiced by direct observation of outcrops, exposures, landscapes, and drill cores. The interband ing of permeable sandstone and mudstone with kogeb clays in the Gwandu Formation is particular ly favourable for the roll type uranium mineralization Dahlkamp, with the peat bands providing the necessary uranium reductant.

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Geology and Mineral Resources of Nigeria

Two models were used each for predicting pore pressure and the corresponding fracture pressure using well log and drilling data. Shale lithology in Niger Delta is massive and characterized by high pore pressure; hence shale compaction theory is utilized in this study. The density and sonic logs were used respectively to generate the shale trend and the shale normal compaction trend used for the prediction. The wells studied showed disequilibrium compaction of sediment to be the major mechanism that gave rise to overpressure in the Niger Delta. Clay diagenesis and fluid expansion were also observed as the secondary overpressure generation mechanism in well X This secondary overpressure mechanism was observed to start approximately at depths of 10, ft TVD. The top of overpressure and the pressure range in the wells studied varied from to 11, ft TVD and

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