Open Access

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

Ehitua Julius Oziegbe

Ehitua Julius Oziegbe

Department of Geosciences, University of LagosLagos, Nigeria
Search for this author on
Sciendo|Google Scholar
Oziegbe, Ehitua Julius
 and 
Olusegun Abimbola Aribike

Olusegun Abimbola Aribike

Department of Geosciences, University of LagosLagos, Nigeria
Search for this author on
Sciendo|Google Scholar
Aribike, Olusegun Abimbola
  
Sep 04, 2023
Field Observations, Petrography, and Microstructures of Granite from Abeokuta Southwestern Nigeria's Cover Image
About this article
Previous Article
Next Article
Cite
Download Cover
Article Category: Original Scientific Article
Published Online: Sep 04, 2023
Page range: 69 - 77
Received: Aug 03, 2021
Accepted: Nov 24, 2021
DOI: https://doi.org/10.2478/rmzmag-2021-0009
Keywords
© 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.
Language:
English
Publication timeframe:
4 times per year
Journal Subjects:
Computer Sciences, Databases and Data Mining, Geosciences, Geodesy, Geology and Mineralogy, Materials Sciences, Materials Characterization and Properties
Journal RSS Feed