Petrography And Microtextural Characteristics Of Granodiorite From Wasimi, Southwestern Nigeria

E. J. Oziegbe (), O. O. Ocan and A. P. Adebisi
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E. J. Oziegbe: Department of Geosciences, Faculty of Science, University of Lagos, Nigeria
O. O. Ocan: Department of Geological Science, College of Science, Engineering and Technology, Osun State University, Nigeria
A. P. Adebisi: Department of Geosciences, Faculty of Science, University of Lagos, Nigeria

Earth Sciences Malaysia (ESMY), 2020, vol. 4, issue 2, 82-89

Abstract: Rock samples of granodiorite from Wasimi were studied in detail to determine the minerals, mineral associations and the different micro-texture present in order to unravel the processes that were involved during the cooling of the magma. The following minerals were observed; plagioclase feldspars, K-feldspars, biotite, pyroxene, amphiboles, with zircon and sphene as accessory minerals. The pyroxene are engulfed in amphiboles and have reaction rims. Pyroxene occur as inclusions in plagioclase feldspars. Amphiboles are poikilitic with inclusions of quartz. Symplectic texture exits between the following minerals; plagioclase and K-feldspar, biotite and quartz, plagioclase and amphibole. The plagioclase feldspars have fractured and bent twin lamellae. Crystals of plagioclase feldspars are zoned and also exhibit both Carlsbad and albite form of twinning. It can be said that there was an initial slow cooling of the magma which was responsible for the large crystals of feldspars which was later followed by rapid cooling as the magma rises close to the surface which gave rise to zoned plagioclase feldspars and indication of high level intrusive.

Keywords: Micro-textures; plagioclase; twinning; reaction rims; intrusive; poikilitic. (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbesmy:v:4:y:2020:i:2:p:82-89

DOI: 10.26480/esmy.02.2020.82.89

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