Geology and granite petrology of the Besar Island, Johore


Author : Azman A. Ghani & Mohd Farid Abu BakarPublication : Bulletin of the Geological Society of MalaysiaVolume : 48Page : 61-64Year : 2004


Description

Bulletin of the Geological Society of Malaysia, Volume 48, June 2004, pp. 61-64

 

Geology and granite petrology of the Besar Island, Johore

AZMAN A. GHANl1 & MOHD FARID ABU BAKAR2

1Department of Geology, University of Malaya, 50603 Kuala Lumpur

2Minerals and Geoscience Department Malaysia, P.O. Box 560, 93658 Kuching, Sarawak

 

Abstract: The Besar Island, located about 13 km off the east coast of Johore is one of the nearest islands off the coast of Johore. The island consists of metasediments, granite and intruded mafic dykes. The granitic rocks in the Besar Island is homogeneous, medium to coarse grained and mostly equigranular. Geochemical data of the granitic rocks show that the rock has a very high SiO2 content more than 76%. The geochemical data suggest that the granite magma originated from anatexis of a homogenous source rock composition (or minimum melt).

 

Abstrak: Pulau Besar terletak 13 km dari pantai timur Johor dan merupakan salah satu di antara pulau yang terdekat dengan pantai Johor. Pulau ini terdiri daripada batuan metasedimen, granit dan diterobosi oleh daik mafik. Batuan granit di Pulau Besar adalah homogenus, berbutir sederhana ke kasar dan kebanyakannya adalah sama butiran. Data geokimia batuan granitik ini menunjukkan ianya mempunyai kandungan SiO2 yang sangat tinggi iaitu lebih daripada 76%. Data geokimia mencadangkan bahawa magma ini berasal dari perleburan batuan punca yang homogenus (atau leburan minimum).

https://doi.org/10.7186/bgsm48200413