PETROGRAPHY, GEOCHEMISTRY AND PETROGENESIS OF GREY GNEISSES OF PART OF OKE-ODE AREA, SOUTH-WESTERN NIGERIA

Simple item page
dc.contributor.authorAdedoyin, A.D.
dc.contributor.authorAlebiosu, M.T.
dc.contributor.authorBamigboye, O.S.
dc.contributor.authorOlobaniyi, S.B.
dc.contributor.authorOmorinoye, O.A.
dc.contributor.authorIheme, K.O.
dc.date.accessioned2022-11-25T12:02:06Z
dc.date.available2022-11-25T12:02:06Z
dc.date.issued2022
dc.description.abstractOke-Ode area, northeast of Ilorin, is part of the Precambrian Basement Complex of southwestern Nigeria. There are no published data on the gneisses, which are well exposed, unlike the adjacent terrains. The area was mapped in order to determine the petrographic, geochemical and petrogenetic attributes of the grey gneisses. The acquired sets of field, mineralogical, and geochemical data indicated that the medium-to coarse-grained gneisses are of igneous origin, and have witnessed multiple tectono-thermal readjustments. Occurrence of xenoliths in the rocks points to magmatic origin. The range of anorthite molecular contents of the plagioclase (An26-34) suggests an andesine to oligoclase composition, indicating derivation from granodioritic to tonalitic progenitors. Petrographic studies showed that the rocks witnessed complex interplay between metamorphism, deformation, and migmatization, which culminated in grain-boundary migration under a relatively stable, low-strain, high temperature conditions involving mechanical rotation, during grain-scale dynamic recrystallization. Geochemically, plots of Ni vs Zr/TiO₂ and K₂O/Al₂O₃ vs Na₂O₃/Al₂O₃ also constrained the the gneisses to the igneous field while the TiO2 - K2O - P₂O₅ ternary plot further indicated a continental tectonic setting prior to the widespread Pan African magmatism. The rocks are essentially peraluminous calc-alkaline rocks, which are moderately saturated with respect to silica. They are products of fractional crystallization of a basaltic magma in a continental setting but later reworked during the Pan African time. The grey gneises have similar geo-chemical characteristics with some gneisses from other parts of the Basement Complex of Nigeria, but at distinct variance with others.en_US
dc.identifier.issn2635-3717
dc.identifier.urihttps://uilspace.unilorin.edu.ng/handle/20.500.12484/7976
dc.language.isoenen_US
dc.publisherPublished by Faculty of Physical Sciences, Chukwuemeka Odumegwu Ojukwu University, Anambra State, Nigeria.en_US
dc.subjectGrey gneissesen_US
dc.subjectgeochemistryen_US
dc.subjectxenolithen_US
dc.subjecttonalitic gneissen_US
dc.subjectperaluminousen_US
dc.subjectprecambrianen_US
dc.titlePETROGRAPHY, GEOCHEMISTRY AND PETROGENESIS OF GREY GNEISSES OF PART OF OKE-ODE AREA, SOUTH-WESTERN NIGERIAen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
ADEDOYIN PAPER PETROGRAPHY, GEOCHEMISTRY AND PETROGENESIS OF GREY GNEISSES.pdf
Size:
1.15 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections