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Materials and Geoenvironment
Volume 68 (2021): Numero 2 (December 2021)
Accesso libero
Field Observations, Petrography, and Microstructures of Granite from Abeokuta Southwestern Nigeria
Ehitua Julius Oziegbe
Ehitua Julius Oziegbe
e
Olusegun Abimbola Aribike
Olusegun Abimbola Aribike
| 04 set 2023
Materials and Geoenvironment
Volume 68 (2021): Numero 2 (December 2021)
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Article Category:
Original Scientific Article
Pubblicato online:
04 set 2023
Pagine:
69 - 77
Ricevuto:
03 ago 2021
Accettato:
24 nov 2021
DOI:
https://doi.org/10.2478/rmzmag-2021-0009
Parole chiave
megacrysts
,
microperthitic
,
K-feldspar
,
zoning
,
porphyroblasts
© 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.
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.