Geology and characterization of feldspar in Gua Musang, Kelantan

The study area located at Kampung Tanah Puteh, Gua Musang, Kelantan at coordinate of N 4°49'35.52" E 101°55'56.84" to N 4°46'49.93" E 101°55'56.84". Gua Musang located in the southern part of Kelantan which consists of argillaceous and interbedded of calcareous rock. The objective of the study is to update geological map with scale of 1:25,000 and to determine the characterization of feldspar in Kg Tanah Puteh, Gua Musang. In this study, six soil samples has been collected for elemental analyses using X-ray Diffraction (XRD) while three rock samples have been selected for elemental analyses using X-ray Fluorescence (XRF). The characteristic of feldspar was identified using petrography method supported by XRD and XRF analyses. As for geological study, the samples were collected randomly throughout the map. In general, the study area consists of limestone, meta-sediment, and tuff. Based on petrography, both plagioclase and alkali feldspar has been spotted in the thin section sample while XRD analysis show that feldspar in the sample has high albite compared to other feldspar as sodium (Na2O) was higher around 7.20% compare with others K2O (4.40%) and Ca (2.7%). Hence, characteristic of the feldspar in the study area composed majorly from Na-end member with minor of K-end member follow by Ca-end member. As for crystalline pattern, twinning of Carlsbad, tartan and lamellar twinning has been spotted by petrography method.