The Schist Enclaves of Oban Massif, Southeastern Nigeria: Consistency of Dihedral Angle and Other Natural Physical and Mechanical Properties
Journal Title: Journal of Geography, Environment and Earth Science International - Year 2017, Vol 9, Issue 1
Abstract
The schist enclaves of Oban massif, southeastern Nigeria were deformed predominantly by brittle deformation and contain a plethora of fractures such as joints and conjugate shear fractures. Analysis of the conjugate shear fractures using stereographic projection technique and statistical methods reveal a consistency in dihedral angle (2θ) in the different schist enclaves studied, irrespective of location. The most frequently occurring (2θ) values range from 55°-60° in this basement terrain and this indicates that the schists were deformed mainly by brittle deformation under similar depth of burial, confining pressure and metamorphic level. The natural angle of internal friction (ɸ) range from 20°-40° while the coefficient of internal friction (µ) range from 0.3 -0.8. These values lend credence to the dihedral angle (2θ) by being consistent in all the schist enclaves. The natural earth pressure coefficient (K) mostly ranges from 2.0 to 4.0 and this implies that the schists of Oban massif even though somewhat variable in mineralogy, have a moderate natural competence. From all indications, natural rock deformation in a quarzo-feldspathic rock mass at the level that schistose grade is produced, may generate dihedral angles mainly in the range of 55°-60°.
Authors and Affiliations
Michael I. Oden, Asinya E. Asinya, Efosa Udinmwen
Keywords
Related Articles
- EP ID EP321413
- DOI 10.9734/JGEESI/2017/28643
- Views 72
- Downloads 0
The Emerging Population Increase and Its Environmental Challenges and Remedies in Iringa Municipal, Tanzania
The study has shown that the environmental challenges encountered in Iringa and most other urban areas in Africa are due to the anthropogenic activities arising from the influxes of migrants from rural areas. The urban a...
Seasonal Trend Analysis of Climatic Indices on Gauge Rivers in N/E Nigeria
The surface water of river basins in particular the Sahel region of north – east Nigeria show very sensitive inter-annual fluctuations due to climate changes. Seasonal changes of climatic indices on water level of six ri...
Bioremediation of Polycyclic Aromatic Hydrocarbons by Bacillus Licheniformis ATHE9 and Bacillus Mojavensis ATHE13 as Newly Strains Isolated from Oil-Contaminated Soil
Removal of Polycyclic Aromatic Hydrocarbons (PAHs) from the environment is important because of their potentially deleterious affect human health. Biological methods that was applied in the present study is typically con...
Application of Electrical Resistivity in Building Foundation Study around Led School Area in Bishini, Northwestern Nigeria
This study evaluated the structural competence of the subsurface geological materials around Led School Area in Bishini, NW Nigeria to delineate the area that is suitable for building development. Twenty Seven vertical e...
Evaluation of Ihiala Laterites for Use as Sub-grade Material in Road Construction
Ten soil samples were collected randomly from Ihiala area at a depth of about 1m using hand auger and shovel for evaluation as a sub-grade material in road construction. These samples were analyzed to determine their che...