Bulletin of the Geological Society of Malaysia, Volume 53, June 2007, pp. 11 – 14
Department of Geology, University of Malaya, 50603 Kuala Lumpur
Abstract: This paper describes some of the important petrographic characteristics of the mafic microgranular enclaves and their host rock as well as their chemical relationship to selected granitic rocks from the Eastern Belt granite of Peninsular Malaysia. The enclaves are invariably darker coloured and finer grained than the enclosing granitic rocks. They usually have sharp contact with the granitic host. Occurrence of acicular apatite and quartz-hornblende ocellar textures in the enclave indicates that quenching and hybridism are among the main processes during cooling of the magmas. The variable geochemical trends in the enclave and their host rocks probably related to the variable degrees of diffusive exchange between the enclave and their host rock magmas during slow cooling.