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The geology,geochemistry of Iroko-granites have been studied and reported in this paper.The study area has been described as of Archaean-Early Proterozoic terrain underlain by migmatite-gneiss-quartzite complex with supracustal rocks.Large number of granites which outcrops in Iroko-Ekiti represent a typical occurrence of granitoids sporadically distributed in the basement and are known to belong to the Older Granite suites,which are attributable to the Pan-African Orogeny(750±150Ma).The rocks occur,mostly as flat and low lying within sparse vegetation.Structures common on and around the outcrops include quartz vein,veinlets,pegmatite dykes which trend North-south,discrete exfoliated surfaces and xenoliths of older rocks.This study reveals that the granites belong to calc-alkalic suites,demonstrate metaluminous nature,and exhibit characteristics of I-type granites.The granite is a distinctive type in that it is relatively highly potassic,has high FeO/(FeO+MgO)ratio,and high average Zr(299.75ppm)concentration with other high field strength elements.The trace elements study implicates pronounced fractional crystallization during evolution of the granites and thus petrogenetically discriminates as Syn-collision provenance.
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篇名 Geology and Geochemistry of Iroko-Granites Southwestern Nigeria:Implication on Provenance
来源期刊 地质研究(英文) 学科 地球科学
关键词 Iroko-granites GRANITOIDS metaluminous fractional crystallization SYN-COLLISION
年,卷(期) 2020,(3) 所属期刊栏目
研究方向 页码范围 56-63
页数 8页 分类号 P59
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Iroko-granites
GRANITOIDS
metaluminous
fractional
crystallization
SYN-COLLISION
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地质研究(英文)
季刊
2630-4961
12 Eu Tong Sen Stree
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41
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