Chemical characteristics of some of the granitic bodies from Terengganu area, Peninsular Malaysia


Author : Azman A GhaniPublication : Bulletin of the Geological Society of MalaysiaVolume : 49Page : 31-36Year : 2004


Description

Bulletin of the Geological Society of Malaysia, Volume 49, April 2004, pp. 31 - 36

 

Chemical characteristics of some of the granitic bodies from Terengganu area, Peninsular Malaysia

AZMAN ABDUL GHANI

Department of Geology, University of Malaya, 50603 Kuala Lumpur

 

Abstract: The present study involves some of the granitic rocks from the Eastern granitic belt which is located in the Terengganu area. Four granitic bodies will be considered: they are Maras Jong pluton, Jerong batholith, Perhentian granite pluton, and Kapal batholith. The range of SiO2 in each granitic body is: Maras Jong (65.67-76.34%), Jerong (66.7-76.9%), Perhentian (70.9-75.4%) and Kapal (63.03-76%). All granites are high K calc alkali. They also have high total alkali content where (Na2O + K2O: 5.9 to 9.8) and are mildly metaluminous to peraluminous (ACNK values: Maras Jong = 1.01 - 1.27; Jerong = 0.98 - 1.05; Perhentian = 0.92 - 1.03 and Kapal = 0.89 - 1.07). LIL elements and TiO2 vs Zr plots of all the granites indicate that K-feldspar, biotite plagioclase, zircon, biotite, hornblende and sphene play an important role in determining the variation during fractionation process. The geochemistry of the granites show that each granitic body has a specific character and probably is made up of individual batches of melt.