Series-2 (Nov. – Dec. 2025) Nov. – Dec. 2025 Issue Statistics
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| Paper Type | : | Research Paper |
| Title | : | Petrology And Structural Geology Of Gneissic Rocks In Bansan Osokom And Its Environs, Southeast Nigeria |
| Country | : | Nigeria |
| Authors | : | U. B. Abia || V. U. Ukaegbu || N. Egesi |
 |
: | 10.9790/0990-1306020109  |
Abstract: This study examined the petrology and structural characteristics of gneissic rocks around Bansan Osokom and its environs to clarify their metamorphic evolution and deformational history. Fourteen representative samples of medium- to coarse-grained migmatite gneisses (9) and granite gneisses (5) were analyzed petrographically. Modal composition indicates biotite–cordierite–garnet migmatite gneiss and biotite–cordierite granite gneiss as the major lithologies. The gneissic rocks display granoblastic to lepidoblastic textures defined by biotite, while garnet shows porphyroblastic.....
Keyword: Bansan Osokom: Cordierite; Peak metamorphism: Polyphase deformation: Retrogression
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- Citation
- Abstract
- Reference
- Full PDF
| Paper Type | : | Research Paper |
| Title | : | Aluminosity and Potassic Trends in Metasediments and Igneous Rocks of the Igarra Schist Belt: A Petrogenetic Approach Using Major Oxide Geochemistry |
| Country | : | Nigeria |
| Authors | : | Modestus Chijioke Ohaegbulem || Nonyelum Stella Iloanya || Uwem Bassey Abia || Michael Monday Inyang |
|
: | 10.9790/0990-1306021017 |
Abstract: Aluminosity and Potassic Trends in Metasedimentary and Igneous Rocks in the Igarra Schist Belt have been investigated. This polycyclic schist belt represents a segment of the Proterozoic Nigerian Basement Complex characterized by metasedimentary and igneous lithologies that have undergone multiple deformational episodes and metamorphism. This study was carried out in order to investigate Aluminosity and potassic trends in representative granites, gneisses, and schists samples from the study area, employing major oxide geochemical data to infer magmatic and metamorphic processes. Potassic classification using K₂O vs. SiO₂ diagram distinguishes......
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