Geochemical Characterization of Mineralized Pegmatites around Wowyen Areas,Akwanga,Northcentral Nigeria  

作　　者：Anthony Chukwu 

机构地区：[1]Department of Geology,Ebonyi State University,Ababkaliki,Nigeria

出　　处：《Advances in Geological and Geotechnical Engineering Research》2022年第1期37-48,共12页地质与岩土工程研究进展（英文）

摘　　要：This study aims to account for the petrogenesis and mineralization of pegmatites around the Wowyen area,northcentral basement complex,Nigeria.Field studies,petrography and whole rock geochemistry(Major oxides were estimated by X-Ray Fluorescence while the trace elements were estimated by Inductively Coupled Plasma Mass Spectrometry)where the methods adopted.The pegmatites around Wowyen area are emplaced in the remobilized belt of the Nigerian Basement complex.They are predominantly complex pegmatites(rare-metal pegmatites)which are intruded in the biotite-muscovite gneiss while the simple pegmatites intruded more in the migmatitic banded gneiss.The major components of the complex pegmatites are quartz,albite and muscovite and tourmaline.The accessory constituents are garnet;ilmenites;cassiterite-columbite-tantalite oxides in contrast to quartz,microcline and biotite of the simple pegmatites.The complex pegmatites show higher peraluminous than the simple pegmatites,however,higher fractionation is observed in the complex pegmatites than the simple pegmatites.The complex pegmatites are rather enriched in rare elements such as Li,Rb,B,Cs,Sn,Nb,Be and Ta and show low ratios in Al/Ga and K/Rb than the simple pegmatites.The pegmatites are likely product of sedimentary origin and originated from post-collisional tectonic event.

关 键 词：Rare-metal pegamatites GEOCHEMISTRY Basement complex Pan-African events Wowyen 

分 类 号：P59[天文地球—地球化学]