Sains Malaysiana 50(4)(2021): 919-928

http://doi.org/10.17576/jsm-2021-5004-04

 

Rare Earth Elements and Fractionation Of Zr-Hf and Y-Ho: Implication to Petrogenesis of Idanre Granite, Nigeria

(Unsur Langka Bumi dan Pecahan Zr-Hf dan Y-Ho: Implikasi terhadap Petrogenesis Granit Idanre, Nigeria)

 

AKINOLA O. OLAGOKE1,2*, AZMAN A. GHANI1,2 & ELVAENE JAMES1,2,3

 

1Department of Geology, Faculty of Science, Ekiti State Universit, Ado-Ekiti, Nigeria

 

2Department of Geology, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia

 

3Department of Geoscience, Faculty of Earth Science, Universiti Malaysia Kelantan, 17600 Jeli, Kelantan Darul Ehsan, Malaysia

 

Diserahkan: 4 November 2019/Diterima: 18 September 2020

 

ABSTRACT

Idanre area which is situated within the Nigerian shield is affected by orogenic activities accompanied by emplacement of Pan-African granitoids. This paper presents a new information on geochemical behaviour of Rare Earth Elements (REEs) and High Field Strength Elements (HFSEs) Zr-Hf and Y-Ho that can explain post magmatic processes relating to the origin and evolution of the Idanre granite. Zr-Hf, Hf-(Zr/Hf) and Y-Ho, (Y/Ho)-Ho variation diagrams depicted similar mobility and migration patterns for Zr, Hf, Y and Ho. Binary plots of Log Zr/Hf vs Log Hf, Log Y/Ho vs Log Ho; high LREE/HREE and negative Eu anomaly shows extensive plagioclase and calcic amphibole fractionation. High Ce/Yb values 113.49, 134.97, and 123.6 reflects low partial melting in the source rocks. Similar Zr/Hf ratios 39.16; 39.3 and 43.26 for members of the granite suite suggest a common source for the minimally differentiated magmatic fluid. Y/Ho ratios of 27.15, 27.12 and 25.91 indicate that the rock units are comagmatic. Mean Zr/Hf (41.69) and Y/Ho (27.18) ratios indicate the host migmatite may be the source rock for the Idanre granite complex.

 

Keywords: Comagmatic; Idanre granite complex; Pan-African granitoids; REEs; Zr/Hf

 

ABSTRAK

Kawasan Idanre yang terletak di dalam kawasan lindungan Nigeria dipengaruhi oleh aktiviti orogenik yang disertai oleh perletakan granitoid Pan-Africa. Kajian ini menyampaikan maklumat baru berkaitan dengan sifat Unsur-unsur Nadir Bumi (REE) dan Unsur Medan Kekuatan Tinggi (HFSE) Zr-Hf dan Y-Ho yang boleh menjelaskan proses selepas-magma berkaitan dengan asalan dan evolusi granit Idanre. Rajah variasi Zr-Hf, Hf-(Zr/Hf) dan Y-Ho, (Y/Ho)-Ho menunjukkan mobiliti dan corak penghijrahan yang sama untuk Zr, Hf, Y dan Ho. Plot perduaan Log Zr/Hf lawan Log Hf, Log Y/Ho lawan Log Ho; LREE/HREE tinggi dan Eu anomali negatif menunjukkan fraksinasi plagioklas dan amfibol kalsik yang luas. Nilai Ce/Yb yang tinggi iaitu 113.49, 134.97 dan 123.6 menunjukkan leburan separa yang rendah dalam batuan punca. Nisbah Zr/Hf menunjukkan nilai 39.16; 39.3 dan 43.26 untuk ahli-ahli suit granit turut mencadangkan pembezaan cecair magma yang kecil untuk punca yang sama. Nisbah Y/Ho iaitu 27.15, 27.12 dan 25.91 menunjukkan unit-unit batuan ialah batuan semagma. Purata nisbah Zr/Hf (41.69) dan Y/Ho (27.18) menunjukkan migmatit mungkin boleh menjadi batuan punca untuk kompleks granit Idanre.

 

Kata kunci: Granitoid Pan-Africa; kompleks granit Idanre; REE, semagma; Zr/Hf

 

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*Pengarang untuk surat-menyurat; email: azmangeo@um.edu.my

 

 

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