Sains Malaysiana 54(2)(2025): 333-341

http://doi.org/10.17576/jsm-2025-5402-02

 

Geochemistry of Permian Kuantan Granite Peninsular Malaysia: Implication to Highly Fractionated I-Type Granite

(Geokimia Permian Granit Kuantan Semenanjung Malaysia: Implikasi kepada Granit Jenis I Berfraksinasi Tinggi)

 

AZMIAH JAMIL¹, AZMAN A. GHANI^1,*, AHMAD FARID ABU BAKAR¹ & MOHD ROZI UMOR²

 

¹Geology Department, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia

²Geology Program, Department of Earth Sciences and Environmental, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

Received: 9 May 2024/Accepted: 7 November 2024

 

Abstract

The 262.0 ± 1.7 Ma Kuantan granite of the Peninsular Malaysia Eastern Belt comprises coarse-grained biotite monzogranite and syenogranite. The granite marked the earliest subduction-related magmatic intrusion during the collision of the Sibumasu and Indochina blocks. This paper reported whole-rock geochemical data of Kuantan granite to constrain the magma source and petrogenesis of the granite. The Kuantan granite stands out due to its elevated SiO₂ concentration, surpassing 72%. It also exhibits high levels of K₂O, ranging from 4.51% to 6.5%. The A/CNK value falls between 1.01 and 1.08, and there are notable negative Eu anomalies that range from 0.05 to 0.27. Together with other older fractionated I-type granites in the easternmost Peninsular Malaysia, they formed distinct granitic facies from the eastern Belt granite proper. This study suggests that the Permian highly fractionated I-type granites resulted from the partial melting of intra-crustal mafic rocks, while the primitive I-type granitic melts underwent significant fractional crystallization.

 

Keywords: Eastern belt granite; fractionated I-type granite; Kuantan granite; Peninsular Malaysia granite

 

Abstrak

Granit Kuantan berumur 262.0 ± 1.7 juta tahun terletak di Jaluran Timur Semenanjung Malaysia terdiri daripada monzogranit dan syinogranit butiran saiz pertengahan ke sangat kasar. Granit ini menandai magma penerobos yang terawal terkait dengan subduksi semasa perlanggaran antara blok Sibumasu dan Indochina. Kertas ini melaporkan data geokimia batuan granit Kuantan untuk merungkaikan asalan magma dan proses kejadiannya. Granit Kuantan dibezakan oleh ketinggian kandungan SiO₂nya melebihi 72%. Ia juga menunjukkan aras ketinggian K₂O daripada 4.51% hingga 6.5%. Nilai A/CNK berada antara 1.01 dan 1.08 dan terdapat anomali Eu negatif yang ketara pada julat dari 0.05 ke 0.27. Bersama dengan granit tua jenis I berfraksinasi di bahagian paling timur di Semenanjung Malaysia yang lain, mereka membentuk fasis granit yang berbeza berbanding dengan granit Jaluran Timur berhampiran. Kajian ini mencadangkan bahawa granit Permian jenis I berfraksinasi tinggi ini dihasilkan daripada batuan mafik di dalam kerak yang dicairkan separa dan kemudiannya granit jenis I yang lebih tua ini mengalami perubahan fraksinasi habluran yang ketara.

 

Kata kunci: Granit jaluran timur; granit jenis-i berfraksinasi; granit Kuantan; granit Semenanjung Malaysia

 

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*Corresponding author; email: azmangeo@um.edu.my