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. OLAGOKE^1,2*, AZMAN A. GHANI^1,2 & ELVAENE JAMES^1,2,3

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