Geochemical Classification and Geotectonic Setting of Granitic Gneisses from Southeastern Margin of Western Nigeria Basement  

作　　者：Mohammed Olatoye Adepoju Yinusa Ayodele Asiwaju-Bello 

机构地区：[1]Department of Applied Geology,The Federal University of Technology,Akure,Nigeria

出　　处：《Journal of Geological Research》2021年第2期1-6,共6页地质研究（英文）

摘　　要：Chemical whole-rock major oxides and some trace element analyses were done on granitic-gneiss rocks from Dagbala-Atte District,located on the southeastern margin of western Nigeria Basement Complex.This was meant to classify the rocks and to understand the tectonic setting in order to evaluate their crustal evolution.The chemical analyses were done using inductively-coupled plasma mass spectrometer.From the results obtained,these rocks classified into calc-alkaline to shoshonite series with metaluminous to peraluminous varieties.They are I-type granitoids of feroan composition.The granitic gneisses formed from metamorphism of granite and granodiorite.Tectonically,most of the rock samples plotted in the field of island arc,continental arc and continental-collisional granitoids,which indicated that the protolith granite and granodiorite are orogenic and are arc related inferring arc tectonic setting.

关 键 词：Migmatite-gneiss-quartzite complex GRANITOID PROTOLITH CALC-ALKALINE Dagbala-Atte district 

分 类 号：P58[天文地球—岩石学]