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Field Observations, Petrography, and Microstructures of Granite from Abeokuta Southwestern Nigeria

Ehitua Julius Oziegbe

Ehitua Julius Oziegbe

Department of Geosciences, University of LagosLagos, Nigeria
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Oziegbe, Ehitua Julius
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Olusegun Abimbola Aribike

Olusegun Abimbola Aribike

Department of Geosciences, University of LagosLagos, Nigeria
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Aribike, Olusegun Abimbola
  
04 sept. 2023
Field Observations, Petrography, and Microstructures of Granite from Abeokuta Southwestern Nigeria's Cover Image
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Catégorie d'article: Original Scientific Article
Publié en ligne: 04 sept. 2023
Pages: 69 - 77
Reçu: 03 août 2021
Accepté: 24 nov. 2021
DOI: https://doi.org/10.2478/rmzmag-2021-0009
Mots clés
© 2021 Ehitua Julius Oziegbe et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

a) Field photograph showing dispersed K-feldspar megacrysts with the preferred alignment from Abeokuta. Megacryts are subhedral to euhedral b) Hand specimen sample of porphyritic granite from Abeokuta showing a large phenocryst of K-feldspar in a matrix of biotite.
a) Field photograph showing dispersed K-feldspar megacrysts with the preferred alignment from Abeokuta. Megacryts are subhedral to euhedral b) Hand specimen sample of porphyritic granite from Abeokuta showing a large phenocryst of K-feldspar in a matrix of biotite.

Figure 2

Field photograph showing a xenolith of porphyritic mafic rock within a felsic, porphyritic granite.
Field photograph showing a xenolith of porphyritic mafic rock within a felsic, porphyritic granite.

Figure 3

Field photographs showing: a) megacrysts of K-feldspar, b) subhedral-euhedral megacrysts of K-feldspar, c) zoned crystals with concentric inclusions of biotite, d) zoned crystals of K-feldspar with a core rich in biotite inclusion, e) K-feldspar magacrysts with inclusions of biotite-defining zonation, f) Zoned K-feldspar crystal with inclusions of biotite, g) zoned crystal of K-feldspar in porphyritic mafic rock, h) matrix-dominated porphyritic mafic rock with zoned megacrysts of K-feldspar.
Field photographs showing: a) megacrysts of K-feldspar, b) subhedral-euhedral megacrysts of K-feldspar, c) zoned crystals with concentric inclusions of biotite, d) zoned crystals of K-feldspar with a core rich in biotite inclusion, e) K-feldspar magacrysts with inclusions of biotite-defining zonation, f) Zoned K-feldspar crystal with inclusions of biotite, g) zoned crystal of K-feldspar in porphyritic mafic rock, h) matrix-dominated porphyritic mafic rock with zoned megacrysts of K-feldspar.

Figure 4

Field photograph showing enclaves of a pophyritic mafic rock component within porphyritic granite. The micro-phenocrysts, megaphenocrysts, and biotite crystals are all aligned in the same direction.
Field photograph showing enclaves of a pophyritic mafic rock component within porphyritic granite. The micro-phenocrysts, megaphenocrysts, and biotite crystals are all aligned in the same direction.

Figure 5

Photomicrographs of porphyritic granite showing a) inclusions of biotite in K-feldspar (Kfs), XPL b) tartan twining in K-feldspar (Kfs), XPL c) albitization of plagioclase feldspar (Kfs), XPL d) perthitic texture in K-feldspar (Kfs), XPL e) K-feldspar with perthitic intergrowth and inclusions of quartz (Qtz), XPL f) symplectic texture between K-feldspar and plagioclase (Pl), XPL g) biotite (Bt) crystals with a preferred alignment, PPL h) biotite (Bt) and K-feldspar (Kfs) in close association, XPL.
Photomicrographs of porphyritic granite showing a) inclusions of biotite in K-feldspar (Kfs), XPL b) tartan twining in K-feldspar (Kfs), XPL c) albitization of plagioclase feldspar (Kfs), XPL d) perthitic texture in K-feldspar (Kfs), XPL e) K-feldspar with perthitic intergrowth and inclusions of quartz (Qtz), XPL f) symplectic texture between K-feldspar and plagioclase (Pl), XPL g) biotite (Bt) crystals with a preferred alignment, PPL h) biotite (Bt) and K-feldspar (Kfs) in close association, XPL.
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Sujets de la revue:
Informatique, Bases de données et exploration de données, Géosciences, Géodésie, Géologie et minéralogie, Sciences des matériaux, Caractérisation et propriétés des matériaux
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