Textural and Geochemical Study of the Older Dykes from Perhentian Island, Peninsular Malaysia

Abstra~t: Textures and relationships. observed in the field suggest that the older dykes intruding the Perhentian Kecil Syenite, Perh~nyan Is~and, we~e coeva! to ~helr ho.s~. Lobate to crenulate contact and necking of the dykes suggest that the dyke magma was Injected Into mobile, semi solId syemtlc magma. Geochemical analyses show that the older dykes have a wide range of Si02, between 48.87 - 56.87% ..