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

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

Materials and Geoenvironment
Volume 68 (2021): Issue 2 (December 2021)
By: Ehitua Julius Oziegbe and  Olusegun Abimbola Aribike  
Open Access
|Sep 2023

Figures & Tables

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.

Figure 2

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.

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.

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.
DOI: https://doi.org/10.2478/rmzmag-2021-0009 | Journal eISSN: 1854-7400
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Language: English
Page range: 69 - 77
Submitted on: Aug 3, 2021
|
Accepted on: Nov 24, 2021
|
Published on: Sep 4, 2023
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
megacrysts,
microperthitic,
K-feldspar,
zoning,
porphyroblasts
Related subjects:
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Databases and data mining,
Geosciences,
Geodesy,
Geology and mineralogy,
Materials sciences,
Materials characterization and properties

© 2023 Ehitua Julius Oziegbe, Olusegun Abimbola Aribike, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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