Permian ultrafelsic A-type granite from Besar Islands group, Johor, peninsular Malaysia

Journal of Earth system science

Fatin Izzani Hazad1⁵  Muhammad Hatta Roselee1⁵  Yu-Ming Lai3¹  Mohd Farid Abu Bakar4²  Mohd Rozi Umor5⁴  Nur Islami1⁵  Sun-Lin Chung3¹  Wan Nur Atiqah Wan Ismail2³  Kyaw Kyaw Nyein1⁵  Azmiah Jamil1⁵  Meor Hakif Amir Hassan1⁵  Azman A Ghani1⁵  Quek Long Xiang1⁵ 

[1] Department of Geosciences, National Taiwan University, Taipei, Taiwan.$$;SapuraKencana Petroleum Bhd, Kuala Lumpur, Malaysia.$$;J Resources Sdn. Bhd. P.O. Box 49, 27207 Kuala Lipis Pahang, Malaysia.$$;Science & Technology Faculty, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.$$;Department of Geology, University of Malaya, 50603, Kuala Lumpur, Malaysia.$$

关键词: Ultrafelsic granite;    A-type granite;    peninsular Malaysia;    Johor island;    eastern belt.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The granitic rocks of the peninsula have traditionally been divided into two provinces, i.e., Western and Eastern provinces, corresponding to S- and I-type granite respectively. The Western Province granite is characterised by megacrystic and coarse-grained biotite, tin-mineralised, continental collision granite, whereas, the Eastern Province granite is bimodal I-type dominated by granodiorite and associated gabbroic of arc type granite. This paper reports the occurrence of an A-type granite from peninsular Malaysia. The rocks occur in the Besar, Tengah, and Hujung islands located in the southeastern part of the peninsula. The granite is highly felsic with SiO2 ranging from 75.70% to 77.90% (differentiation index = 94.2–97.04). It is weakly peraluminous (average ACNK=1.02), has normative hypersthene (0.09–2.19%) and high alkali content (8.32–8.60%). The granites have many A-type characteristics, among them are shallow level of emplacement, high Ga, FeT/MgO and low P, Sr, Ti, CaO and Nb. Calculated zircon saturation temperatures for the Besar magma ranging from 793° to 806°C is consistent with high temperature partial melting of a felsic infracrustal source which is taken as one of the mechanisms to produce A-type magma. The occurrence of the A-type granite can be related to the extensional back arc basin in the Indo-China terrane during the earliest Permian.

【 授权许可】

Unknown