Morphology, field observations and petrographic descriptions of Gombak Selangor Quartz Ridge, Hulu Klang, Selangor Malaysia

Abstract

The Klang Gates Quartz Ridge was formally named as the Gombak Selangor Quartz Ridge (GSQR) by the Selangor State Government by 24 June 2015. It was built entirely of quartz vein formed when residual magma crystallized and consolidated within vertical slab of dyke through large linear fissures within massive granitic rock known as Kuala Lumpur Granite about 200 million years ago. The GSQR can be divided into the eastern and western section by the dam. Three type of quartz crystal growth was identified as rutile quartz growth, milky quartz and smoky quartz. The milky quartz was found dominantly at the eastern section; whilst at the western section consists of smoky and milky quartz. At least three phases of quartz vein intrusions were recognized in our survey which is identified as major phase, fault phase and minor phase. The petrography study show the most abundant mineral is quartz (> 90%), alkali feldspar and plagioclase is less than 5%, while zircon and apatite occurs as accessory mineral as inclusion in quartz crystal. Small biotite and muscovite also observed on certain sample. Our survey shows that the Gombak Selangor Quartz Ridge is unique not only due to panorama views of Kuala Lumpur but also on their quartz crystal grow and vein structure as an aesthetic values.

Keywords: Gombak Selangor Quartz Ridge Malaysia, Field observations, Petrography descriptions